918 lines
27 KiB
HTML
918 lines
27 KiB
HTML
<!--
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NOTE: You need to build the notes plugin after making changes to this file.
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-->
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>reveal.js - Speaker View</title>
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<style>
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body {
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font-family: Helvetica;
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font-size: 18px;
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}
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#current-slide,
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#upcoming-slide,
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#speaker-controls {
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padding: 6px;
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box-sizing: border-box;
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-moz-box-sizing: border-box;
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}
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#current-slide iframe,
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#upcoming-slide iframe {
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width: 100%;
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height: 100%;
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border: 1px solid #ddd;
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}
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#current-slide .label,
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#upcoming-slide .label {
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position: absolute;
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top: 10px;
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left: 10px;
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z-index: 2;
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}
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#connection-status {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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z-index: 20;
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padding: 30% 20% 20% 20%;
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font-size: 18px;
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color: #222;
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background: #fff;
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text-align: center;
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box-sizing: border-box;
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line-height: 1.4;
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}
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.overlay-element {
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height: 34px;
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line-height: 34px;
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padding: 0 10px;
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text-shadow: none;
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background: rgba(220, 220, 220, 0.8);
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color: #222;
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font-size: 14px;
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}
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.overlay-element.interactive:hover {
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background: rgba(220, 220, 220, 1);
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}
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#current-slide {
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position: absolute;
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width: 60%;
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height: 100%;
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top: 0;
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left: 0;
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padding-right: 0;
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}
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#upcoming-slide {
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position: absolute;
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width: 40%;
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height: 40%;
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right: 0;
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top: 0;
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}
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/* Speaker controls */
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#speaker-controls {
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position: absolute;
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top: 40%;
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right: 0;
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width: 40%;
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height: 60%;
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overflow: auto;
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font-size: 18px;
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}
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.speaker-controls-time.hidden,
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.speaker-controls-notes.hidden {
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display: none;
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}
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.speaker-controls-time .label,
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.speaker-controls-pace .label,
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.speaker-controls-notes .label {
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text-transform: uppercase;
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font-weight: normal;
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font-size: 0.66em;
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color: #666;
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margin: 0;
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}
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.speaker-controls-time,
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.speaker-controls-pace {
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border-bottom: 1px solid rgba(200, 200, 200, 0.5);
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margin-bottom: 10px;
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padding: 10px 16px;
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padding-bottom: 20px;
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cursor: pointer;
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}
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.speaker-controls-time .reset-button {
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opacity: 0;
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float: right;
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color: #666;
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text-decoration: none;
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}
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.speaker-controls-time:hover .reset-button {
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opacity: 1;
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}
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.speaker-controls-time .timer,
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.speaker-controls-time .clock {
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width: 50%;
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}
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.speaker-controls-time .timer,
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.speaker-controls-time .clock,
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.speaker-controls-time .pacing .hours-value,
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.speaker-controls-time .pacing .minutes-value,
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.speaker-controls-time .pacing .seconds-value {
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font-size: 1.9em;
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}
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.speaker-controls-time .timer {
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float: left;
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}
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.speaker-controls-time .clock {
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float: right;
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text-align: right;
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}
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.speaker-controls-time span.mute {
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opacity: 0.3;
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}
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.speaker-controls-time .pacing-title {
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margin-top: 5px;
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}
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.speaker-controls-time .pacing.ahead {
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color: blue;
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}
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.speaker-controls-time .pacing.on-track {
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color: green;
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}
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.speaker-controls-time .pacing.behind {
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color: red;
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}
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.speaker-controls-notes {
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padding: 10px 16px;
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}
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.speaker-controls-notes .value {
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margin-top: 5px;
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line-height: 1.4;
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font-size: 1.2em;
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}
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/* Layout selector */
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#speaker-layout {
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position: absolute;
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top: 10px;
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right: 10px;
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color: #222;
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z-index: 10;
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}
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#speaker-layout select {
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position: absolute;
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width: 100%;
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height: 100%;
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top: 0;
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left: 0;
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border: 0;
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box-shadow: 0;
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cursor: pointer;
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opacity: 0;
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font-size: 1em;
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background-color: transparent;
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-moz-appearance: none;
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-webkit-appearance: none;
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-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
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}
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#speaker-layout select:focus {
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outline: none;
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box-shadow: none;
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}
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.clear {
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clear: both;
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}
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/* Speaker layout: Wide */
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body[data-speaker-layout="wide"] #current-slide,
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body[data-speaker-layout="wide"] #upcoming-slide {
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width: 50%;
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height: 45%;
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padding: 6px;
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}
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body[data-speaker-layout="wide"] #current-slide {
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top: 0;
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left: 0;
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}
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body[data-speaker-layout="wide"] #upcoming-slide {
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top: 0;
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left: 50%;
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}
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body[data-speaker-layout="wide"] #speaker-controls {
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top: 45%;
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left: 0;
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width: 100%;
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height: 50%;
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font-size: 1.25em;
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}
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/* Speaker layout: Tall */
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body[data-speaker-layout="tall"] #current-slide,
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body[data-speaker-layout="tall"] #upcoming-slide {
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width: 45%;
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height: 50%;
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padding: 6px;
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}
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body[data-speaker-layout="tall"] #current-slide {
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top: 0;
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left: 0;
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}
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body[data-speaker-layout="tall"] #upcoming-slide {
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top: 50%;
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left: 0;
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}
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body[data-speaker-layout="tall"] #speaker-controls {
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padding-top: 40px;
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top: 0;
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left: 45%;
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width: 55%;
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height: 100%;
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font-size: 1.25em;
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}
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/* Speaker layout: Notes only */
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body[data-speaker-layout="notes-only"] #current-slide,
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body[data-speaker-layout="notes-only"] #upcoming-slide {
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display: none;
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}
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body[data-speaker-layout="notes-only"] #speaker-controls {
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padding-top: 40px;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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font-size: 1.25em;
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}
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@media screen and (max-width: 1080px) {
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body[data-speaker-layout="default"] #speaker-controls {
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font-size: 16px;
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}
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}
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@media screen and (max-width: 900px) {
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body[data-speaker-layout="default"] #speaker-controls {
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font-size: 14px;
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}
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}
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@media screen and (max-width: 800px) {
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body[data-speaker-layout="default"] #speaker-controls {
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font-size: 12px;
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}
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}
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</style>
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</head>
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<body>
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<div id="connection-status">Loading speaker view...</div>
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<div id="current-slide"></div>
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<div id="upcoming-slide">
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<span class="overlay-element label">Upcoming</span>
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</div>
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<div id="speaker-controls">
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<div class="speaker-controls-time">
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<h4 class="label">
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Time <span class="reset-button">Click to Reset</span>
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</h4>
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<div class="clock">
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<span class="clock-value">0:00 AM</span>
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</div>
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<div class="timer">
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<span class="hours-value">00</span
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><span class="minutes-value">:00</span
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><span class="seconds-value">:00</span>
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</div>
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<div class="clear"></div>
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<h4 class="label pacing-title" style="display: none">
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Pacing – Time to finish current slide
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</h4>
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<div class="pacing" style="display: none">
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<span class="hours-value">00</span
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><span class="minutes-value">:00</span
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><span class="seconds-value">:00</span>
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</div>
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</div>
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<div class="speaker-controls-notes hidden">
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<h4 class="label">Notes</h4>
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<div class="value"></div>
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</div>
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</div>
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<div id="speaker-layout" class="overlay-element interactive">
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<span class="speaker-layout-label"></span>
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<select class="speaker-layout-dropdown"></select>
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</div>
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<script>
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(function () {
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var notes,
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notesValue,
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currentState,
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currentSlide,
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upcomingSlide,
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layoutLabel,
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layoutDropdown,
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pendingCalls = {},
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lastRevealApiCallId = 0,
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connected = false;
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var connectionStatus = document.querySelector("#connection-status");
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var SPEAKER_LAYOUTS = {
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default: "Default",
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wide: "Wide",
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tall: "Tall",
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"notes-only": "Notes only",
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};
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setupLayout();
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let openerOrigin;
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try {
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openerOrigin = window.opener.location.origin;
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} catch (error) {
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console.warn(error);
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}
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// In order to prevent XSS, the speaker view will only run if its
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// opener has the same origin as itself
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if (window.location.origin !== openerOrigin) {
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connectionStatus.innerHTML =
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"Cross origin error.<br>The speaker window can only be opened from the same origin.";
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return;
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}
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var connectionTimeout = setTimeout(function () {
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connectionStatus.innerHTML =
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"Error connecting to main window.<br>Please try closing and reopening the speaker view.";
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}, 5000);
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window.addEventListener("message", function (event) {
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clearTimeout(connectionTimeout);
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connectionStatus.style.display = "none";
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var data = JSON.parse(event.data);
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// The overview mode is only useful to the reveal.js instance
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// where navigation occurs so we don't sync it
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if (data.state) delete data.state.overview;
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// Messages sent by the notes plugin inside of the main window
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if (data && data.namespace === "reveal-notes") {
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if (data.type === "connect") {
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handleConnectMessage(data);
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} else if (data.type === "state") {
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handleStateMessage(data);
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} else if (data.type === "return") {
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pendingCalls[data.callId](data.result);
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delete pendingCalls[data.callId];
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}
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}
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// Messages sent by the reveal.js inside of the current slide preview
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else if (data && data.namespace === "reveal") {
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if (/ready/.test(data.eventName)) {
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// Send a message back to notify that the handshake is complete
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||
window.opener.postMessage(
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JSON.stringify({
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||
namespace: "reveal-notes",
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type: "connected",
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||
}),
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"*"
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);
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} else if (
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||
/slidechanged|fragmentshown|fragmenthidden|paused|resumed/.test(
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data.eventName
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) &&
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currentState !== JSON.stringify(data.state)
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) {
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||
dispatchStateToMainWindow(data.state);
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||
}
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||
}
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||
});
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||
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/**
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* Updates the presentation in the main window to match the state
|
||
* of the presentation in the notes window.
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||
*/
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const dispatchStateToMainWindow = debounce((state) => {
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||
window.opener.postMessage(
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JSON.stringify({ method: "setState", args: [state] }),
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||
"*"
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||
);
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||
}, 500);
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||
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/**
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* Asynchronously calls the Reveal.js API of the main frame.
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||
*/
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function callRevealApi(methodName, methodArguments, callback) {
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var callId = ++lastRevealApiCallId;
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pendingCalls[callId] = callback;
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window.opener.postMessage(
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||
JSON.stringify({
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||
namespace: "reveal-notes",
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type: "call",
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||
callId: callId,
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||
methodName: methodName,
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||
arguments: methodArguments,
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||
}),
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||
"*"
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||
);
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||
}
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||
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||
/**
|
||
* Called when the main window is trying to establish a
|
||
* connection.
|
||
*/
|
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function handleConnectMessage(data) {
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||
if (connected === false) {
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||
connected = true;
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||
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||
setupIframes(data);
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||
setupKeyboard();
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setupNotes();
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||
setupTimer();
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||
setupHeartbeat();
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||
}
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||
}
|
||
|
||
/**
|
||
* Called when the main window sends an updated state.
|
||
*/
|
||
function handleStateMessage(data) {
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||
// Store the most recently set state to avoid circular loops
|
||
// applying the same state
|
||
currentState = JSON.stringify(data.state);
|
||
|
||
// No need for updating the notes in case of fragment changes
|
||
if (data.notes) {
|
||
notes.classList.remove("hidden");
|
||
notesValue.style.whiteSpace = data.whitespace;
|
||
if (data.markdown) {
|
||
notesValue.innerHTML = marked(data.notes);
|
||
} else {
|
||
notesValue.innerHTML = data.notes;
|
||
}
|
||
} else {
|
||
notes.classList.add("hidden");
|
||
}
|
||
|
||
// Update the note slides
|
||
currentSlide.contentWindow.postMessage(
|
||
JSON.stringify({ method: "setState", args: [data.state] }),
|
||
"*"
|
||
);
|
||
upcomingSlide.contentWindow.postMessage(
|
||
JSON.stringify({ method: "setState", args: [data.state] }),
|
||
"*"
|
||
);
|
||
upcomingSlide.contentWindow.postMessage(
|
||
JSON.stringify({ method: "next" }),
|
||
"*"
|
||
);
|
||
}
|
||
|
||
// Limit to max one state update per X ms
|
||
handleStateMessage = debounce(handleStateMessage, 200);
|
||
|
||
/**
|
||
* Forward keyboard events to the current slide window.
|
||
* This enables keyboard events to work even if focus
|
||
* isn't set on the current slide iframe.
|
||
*
|
||
* Block F5 default handling, it reloads and disconnects
|
||
* the speaker notes window.
|
||
*/
|
||
function setupKeyboard() {
|
||
document.addEventListener("keydown", function (event) {
|
||
if (
|
||
event.keyCode === 116 ||
|
||
(event.metaKey && event.keyCode === 82)
|
||
) {
|
||
event.preventDefault();
|
||
return false;
|
||
}
|
||
currentSlide.contentWindow.postMessage(
|
||
JSON.stringify({ method: "triggerKey", args: [event.keyCode] }),
|
||
"*"
|
||
);
|
||
});
|
||
}
|
||
|
||
/**
|
||
* Creates the preview iframes.
|
||
*/
|
||
function setupIframes(data) {
|
||
var params = [
|
||
"receiver",
|
||
"progress=false",
|
||
"history=false",
|
||
"transition=none",
|
||
"autoSlide=0",
|
||
"backgroundTransition=none",
|
||
].join("&");
|
||
|
||
var urlSeparator = /\?/.test(data.url) ? "&" : "?";
|
||
var hash = "#/" + data.state.indexh + "/" + data.state.indexv;
|
||
var currentURL =
|
||
data.url + urlSeparator + params + "&postMessageEvents=true" + hash;
|
||
var upcomingURL =
|
||
data.url + urlSeparator + params + "&controls=false" + hash;
|
||
|
||
currentSlide = document.createElement("iframe");
|
||
currentSlide.setAttribute("width", 1280);
|
||
currentSlide.setAttribute("height", 1024);
|
||
currentSlide.setAttribute("src", currentURL);
|
||
document.querySelector("#current-slide").appendChild(currentSlide);
|
||
|
||
upcomingSlide = document.createElement("iframe");
|
||
upcomingSlide.setAttribute("width", 640);
|
||
upcomingSlide.setAttribute("height", 512);
|
||
upcomingSlide.setAttribute("src", upcomingURL);
|
||
document.querySelector("#upcoming-slide").appendChild(upcomingSlide);
|
||
}
|
||
|
||
/**
|
||
* Setup the notes UI.
|
||
*/
|
||
function setupNotes() {
|
||
notes = document.querySelector(".speaker-controls-notes");
|
||
notesValue = document.querySelector(".speaker-controls-notes .value");
|
||
}
|
||
|
||
/**
|
||
* We send out a heartbeat at all times to ensure we can
|
||
* reconnect with the main presentation window after reloads.
|
||
*/
|
||
function setupHeartbeat() {
|
||
setInterval(() => {
|
||
window.opener.postMessage(
|
||
JSON.stringify({ namespace: "reveal-notes", type: "heartbeat" }),
|
||
"*"
|
||
);
|
||
}, 1000);
|
||
}
|
||
|
||
function getTimings(callback) {
|
||
callRevealApi("getSlidesAttributes", [], function (slideAttributes) {
|
||
callRevealApi("getConfig", [], function (config) {
|
||
var totalTime = config.totalTime;
|
||
var minTimePerSlide = config.minimumTimePerSlide || 0;
|
||
var defaultTiming = config.defaultTiming;
|
||
if (defaultTiming == null && totalTime == null) {
|
||
callback(null);
|
||
return;
|
||
}
|
||
// Setting totalTime overrides defaultTiming
|
||
if (totalTime) {
|
||
defaultTiming = 0;
|
||
}
|
||
var timings = [];
|
||
for (var i in slideAttributes) {
|
||
var slide = slideAttributes[i];
|
||
var timing = defaultTiming;
|
||
if (slide.hasOwnProperty("data-timing")) {
|
||
var t = slide["data-timing"];
|
||
timing = parseInt(t);
|
||
if (isNaN(timing)) {
|
||
console.warn(
|
||
"Could not parse timing '" +
|
||
t +
|
||
"' of slide " +
|
||
i +
|
||
"; using default of " +
|
||
defaultTiming
|
||
);
|
||
timing = defaultTiming;
|
||
}
|
||
}
|
||
timings.push(timing);
|
||
}
|
||
if (totalTime) {
|
||
// After we've allocated time to individual slides, we summarize it and
|
||
// subtract it from the total time
|
||
var remainingTime =
|
||
totalTime -
|
||
timings.reduce(function (a, b) {
|
||
return a + b;
|
||
}, 0);
|
||
// The remaining time is divided by the number of slides that have 0 seconds
|
||
// allocated at the moment, giving the average time-per-slide on the remaining slides
|
||
var remainingSlides = timings.filter(function (x) {
|
||
return x == 0;
|
||
}).length;
|
||
var timePerSlide = Math.round(
|
||
remainingTime / remainingSlides,
|
||
0
|
||
);
|
||
// And now we replace every zero-value timing with that average
|
||
timings = timings.map(function (x) {
|
||
return x == 0 ? timePerSlide : x;
|
||
});
|
||
}
|
||
var slidesUnderMinimum = timings.filter(function (x) {
|
||
return x < minTimePerSlide;
|
||
}).length;
|
||
if (slidesUnderMinimum) {
|
||
message =
|
||
"The pacing time for " +
|
||
slidesUnderMinimum +
|
||
" slide(s) is under the configured minimum of " +
|
||
minTimePerSlide +
|
||
" seconds. Check the data-timing attribute on individual slides, or consider increasing the totalTime or minimumTimePerSlide configuration options (or removing some slides).";
|
||
alert(message);
|
||
}
|
||
callback(timings);
|
||
});
|
||
});
|
||
}
|
||
|
||
/**
|
||
* Return the number of seconds allocated for presenting
|
||
* all slides up to and including this one.
|
||
*/
|
||
function getTimeAllocated(timings, callback) {
|
||
callRevealApi("getSlidePastCount", [], function (currentSlide) {
|
||
var allocated = 0;
|
||
for (var i in timings.slice(0, currentSlide + 1)) {
|
||
allocated += timings[i];
|
||
}
|
||
callback(allocated);
|
||
});
|
||
}
|
||
|
||
/**
|
||
* Create the timer and clock and start updating them
|
||
* at an interval.
|
||
*/
|
||
function setupTimer() {
|
||
var start = new Date(),
|
||
timeEl = document.querySelector(".speaker-controls-time"),
|
||
clockEl = timeEl.querySelector(".clock-value"),
|
||
hoursEl = timeEl.querySelector(".hours-value"),
|
||
minutesEl = timeEl.querySelector(".minutes-value"),
|
||
secondsEl = timeEl.querySelector(".seconds-value"),
|
||
pacingTitleEl = timeEl.querySelector(".pacing-title"),
|
||
pacingEl = timeEl.querySelector(".pacing"),
|
||
pacingHoursEl = pacingEl.querySelector(".hours-value"),
|
||
pacingMinutesEl = pacingEl.querySelector(".minutes-value"),
|
||
pacingSecondsEl = pacingEl.querySelector(".seconds-value");
|
||
|
||
var timings = null;
|
||
getTimings(function (_timings) {
|
||
timings = _timings;
|
||
if (_timings !== null) {
|
||
pacingTitleEl.style.removeProperty("display");
|
||
pacingEl.style.removeProperty("display");
|
||
}
|
||
|
||
// Update once directly
|
||
_updateTimer();
|
||
|
||
// Then update every second
|
||
setInterval(_updateTimer, 1000);
|
||
});
|
||
|
||
function _resetTimer() {
|
||
if (timings == null) {
|
||
start = new Date();
|
||
_updateTimer();
|
||
} else {
|
||
// Reset timer to beginning of current slide
|
||
getTimeAllocated(timings, function (slideEndTimingSeconds) {
|
||
var slideEndTiming = slideEndTimingSeconds * 1000;
|
||
callRevealApi("getSlidePastCount", [], function (currentSlide) {
|
||
var currentSlideTiming = timings[currentSlide] * 1000;
|
||
var previousSlidesTiming =
|
||
slideEndTiming - currentSlideTiming;
|
||
var now = new Date();
|
||
start = new Date(now.getTime() - previousSlidesTiming);
|
||
_updateTimer();
|
||
});
|
||
});
|
||
}
|
||
}
|
||
|
||
timeEl.addEventListener("click", function () {
|
||
_resetTimer();
|
||
return false;
|
||
});
|
||
|
||
function _displayTime(hrEl, minEl, secEl, time) {
|
||
var sign = Math.sign(time) == -1 ? "-" : "";
|
||
time = Math.abs(Math.round(time / 1000));
|
||
var seconds = time % 60;
|
||
var minutes = Math.floor(time / 60) % 60;
|
||
var hours = Math.floor(time / (60 * 60));
|
||
hrEl.innerHTML = sign + zeroPadInteger(hours);
|
||
if (hours == 0) {
|
||
hrEl.classList.add("mute");
|
||
} else {
|
||
hrEl.classList.remove("mute");
|
||
}
|
||
minEl.innerHTML = ":" + zeroPadInteger(minutes);
|
||
if (hours == 0 && minutes == 0) {
|
||
minEl.classList.add("mute");
|
||
} else {
|
||
minEl.classList.remove("mute");
|
||
}
|
||
secEl.innerHTML = ":" + zeroPadInteger(seconds);
|
||
}
|
||
|
||
function _updateTimer() {
|
||
var diff,
|
||
hours,
|
||
minutes,
|
||
seconds,
|
||
now = new Date();
|
||
|
||
diff = now.getTime() - start.getTime();
|
||
|
||
clockEl.innerHTML = now.toLocaleTimeString("en-US", {
|
||
hour12: true,
|
||
hour: "2-digit",
|
||
minute: "2-digit",
|
||
});
|
||
_displayTime(hoursEl, minutesEl, secondsEl, diff);
|
||
if (timings !== null) {
|
||
_updatePacing(diff);
|
||
}
|
||
}
|
||
|
||
function _updatePacing(diff) {
|
||
getTimeAllocated(timings, function (slideEndTimingSeconds) {
|
||
var slideEndTiming = slideEndTimingSeconds * 1000;
|
||
|
||
callRevealApi("getSlidePastCount", [], function (currentSlide) {
|
||
var currentSlideTiming = timings[currentSlide] * 1000;
|
||
var timeLeftCurrentSlide = slideEndTiming - diff;
|
||
if (timeLeftCurrentSlide < 0) {
|
||
pacingEl.className = "pacing behind";
|
||
} else if (timeLeftCurrentSlide < currentSlideTiming) {
|
||
pacingEl.className = "pacing on-track";
|
||
} else {
|
||
pacingEl.className = "pacing ahead";
|
||
}
|
||
_displayTime(
|
||
pacingHoursEl,
|
||
pacingMinutesEl,
|
||
pacingSecondsEl,
|
||
timeLeftCurrentSlide
|
||
);
|
||
});
|
||
});
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Sets up the speaker view layout and layout selector.
|
||
*/
|
||
function setupLayout() {
|
||
layoutDropdown = document.querySelector(".speaker-layout-dropdown");
|
||
layoutLabel = document.querySelector(".speaker-layout-label");
|
||
|
||
// Render the list of available layouts
|
||
for (var id in SPEAKER_LAYOUTS) {
|
||
var option = document.createElement("option");
|
||
option.setAttribute("value", id);
|
||
option.textContent = SPEAKER_LAYOUTS[id];
|
||
layoutDropdown.appendChild(option);
|
||
}
|
||
|
||
// Monitor the dropdown for changes
|
||
layoutDropdown.addEventListener(
|
||
"change",
|
||
function (event) {
|
||
setLayout(layoutDropdown.value);
|
||
},
|
||
false
|
||
);
|
||
|
||
// Restore any currently persisted layout
|
||
setLayout(getLayout());
|
||
}
|
||
|
||
/**
|
||
* Sets a new speaker view layout. The layout is persisted
|
||
* in local storage.
|
||
*/
|
||
function setLayout(value) {
|
||
var title = SPEAKER_LAYOUTS[value];
|
||
|
||
layoutLabel.innerHTML = "Layout" + (title ? ": " + title : "");
|
||
layoutDropdown.value = value;
|
||
|
||
document.body.setAttribute("data-speaker-layout", value);
|
||
|
||
// Persist locally
|
||
if (supportsLocalStorage()) {
|
||
window.localStorage.setItem("reveal-speaker-layout", value);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Returns the ID of the most recently set speaker layout
|
||
* or our default layout if none has been set.
|
||
*/
|
||
function getLayout() {
|
||
if (supportsLocalStorage()) {
|
||
var layout = window.localStorage.getItem("reveal-speaker-layout");
|
||
if (layout) {
|
||
return layout;
|
||
}
|
||
}
|
||
|
||
// Default to the first record in the layouts hash
|
||
for (var id in SPEAKER_LAYOUTS) {
|
||
return id;
|
||
}
|
||
}
|
||
|
||
function supportsLocalStorage() {
|
||
try {
|
||
localStorage.setItem("test", "test");
|
||
localStorage.removeItem("test");
|
||
return true;
|
||
} catch (e) {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
function zeroPadInteger(num) {
|
||
var str = "00" + parseInt(num);
|
||
return str.substring(str.length - 2);
|
||
}
|
||
|
||
/**
|
||
* Limits the frequency at which a function can be called.
|
||
*/
|
||
function debounce(fn, ms) {
|
||
var lastTime = 0,
|
||
timeout;
|
||
|
||
return function () {
|
||
var args = arguments;
|
||
var context = this;
|
||
|
||
clearTimeout(timeout);
|
||
|
||
var timeSinceLastCall = Date.now() - lastTime;
|
||
if (timeSinceLastCall > ms) {
|
||
fn.apply(context, args);
|
||
lastTime = Date.now();
|
||
} else {
|
||
timeout = setTimeout(function () {
|
||
fn.apply(context, args);
|
||
lastTime = Date.now();
|
||
}, ms - timeSinceLastCall);
|
||
}
|
||
};
|
||
}
|
||
})();
|
||
</script>
|
||
</body>
|
||
</html>
|