ontimeupdate event

[アーティクル]
05/02/2017

Occurs to indicate the current playback position.

Syntax

Event Property	object.ontimeupdate = handler;
addEventListener Method	object.addEventListener("timeupdate", handler, useCapture)

Event information

Synchronous	No
Bubbles	No
Cancelable	No

Event handler parameters

handler [in]
Type: function

Event handler object.

Standards information

HTML5 A vocabulary and associated APIs for HTML and XHTML, Section 4.8.9.12

Remarks

Use the currentTime property to retrieve the current playback position. For the total length of the audio or video clip, use duration.

To invoke this event, do one of the following:

Play the video.
Move the position indicator on the playback controls.

Note This event is fired approximately four times a second.

Examples

This example shows how to use the timeupdate event and the currentTime property to track the elapsed time while a video plays. See the example online.

<!DOCTYPE html>
<html>
  <head>
    <title>Simple Video Example</title>
      <!-- Uncomment the following tag when developing on a local or intranet computer -->
      <!-- <meta http-equiv-'X-UA-Compatible' content="ie9" />  -->        
</head>
<body>
<video id="video1" >
   HTML5 video is not supported
</video><br />

<input type="text" id="videoFile" style="width:600px" value="http://ie.microsoft.com/testdrive/ieblog/2011/nov/pp4_blog_demo.mp4"/>
  
  <!-- Button width set so overall size doesn't change when we toggle the label -->
  <button id="playButton" style="width: 80px" >Play</button>
  <div >Elapsed Time: <span id="timeDisplay"></span></div>

   <script>

     var oVideo = document.getElementById("video1");      //video element
     var button = document.getElementById("playButton");
     var display = document.getElementById("timeDisplay");

     //  Capture time changes and display current position
     oVideo.addEventListener("timeupdate", function () {
       display.innerText = oVideo.currentTime.toFixed(2) ;
     }, false);

     button.addEventListener("click", function () {
       //  toggle between play and pause based on the paused property
       if (oVideo.paused) {
         var oInput = document.getElementById('videoFile');   //text box
         if (oInput.value) {
           //  only load a video file when the text field changes
           if (oInput.value != oVideo.src) {
             oVideo.src = oInput.value;
             oVideo.load();
           }
           oVideo.play();
         }
       } else {
         oVideo.pause();
       }
     }, false);

     // Capture the play event and set the button to say pause
     oVideo.addEventListener("play", function () {
       button.innerHTML = "Pause";
     }, false);

     // Capture the pause event and set the button to say play
     oVideo.addEventListener("pause", function () {
       button.innerHTML = "Play";
     }, false);


     </script>
</body>
</html>

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