I believe I’m having a relatively simple problem with a video player implementation in javascript. To start, I want to add a string to an array and reference that first string entry as the src of my source in my video tag. I then want the video to begin playing once the src is received.
I have not implemented the code for the latter since I haven’t gotten past the former yet. I’ve seen people make reference to a .load() function call after changing the src but I don’t know if I’m correctly setting the src to begin with.
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Untitled Document</title>
<style>
video
{
background-color:#333;
}
</style>
</head>
<body>
<script type="text/javascript">
var width = (1280 * 0.1);
var height = (720 * 0.1);
var resized = false;
function getWidth(){
return width;
}
function getHeight(){
return height;
}
//Create array. Checkbox adds video to list.
//"Submit" button gives first video in list to player.
var videoList = new Array();
var i = 0; //incrementer
//Use checkbox's value as argument
function addVideo(value){
videoList[i] = value;
i++;
}
function videoSubmit(){
document.getElementById("player").setAttribute("src", videoList[i]);
}
</script>
<video id="test" width="getWidth()" height="getHeight()">
<source id="player" src="null" type="video/avi" width="getWidth()" height="getHeight()"/>
</video>
<br/>
<form id="selector" action="">
<input type="checkbox" name="firstvideo" value="test.avi" onClick="addVideo(test.avi)"/> sample 1.avi<br/>
</form>
<button onClick="videoSubmit()"> Submit</button>
</body>
</html>
I’m quite new to javascript and am still trying to wrap my head around it. Any helpful information is greatly appreciated.
Answer
Looks like i has the wrong value. Try:
function videoSubmit(){
document.getElementById("player").setAttribute("src", videoList[ i - 1 ]);
}
There are a few other issues as well. Here’s a fixed version – enjoy:
Another problem:
You can’t do this:
<video id="test" width="getWidth()" height="getHeight()">
If you want to programatically set those attributes, you must do it the same way you are with the src attribute. Sometimes you’ll see this sort of construct, but it’s clumsy:
<script>document.write('<video id="test" width="' + getWidth() + '" ...')</script>
Unrelated to the Q – you could skip a lot of javascript learning pain by jumping straight to jquery. It does incur a page-load penalty, but it cures a lot of the annoyances of pure javascript. Doing it the old fashioned way will give you “valuable experience” – which those of us who have it value probably more than warranted.