Change image when clicking button

2019-05-28 04:51发布

站内问答 / JavaScript
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This seems like it should work but doesn't. I'm not sure where the problem is - either I'm doing it wrong, or it's possible I have a syntax error. I just doesn't do anything. I'm trying to get the current picture to change when the button is clicked. I'm a beginner at Javascript, so please be gentle ;) Thank you!

<html>
<script>
function pictureChange()
{
document.getElementById(theImage).src="http://31.media.tumblr.com/fca646cd8fe87906e605ad7e8d039903/tumblr_mmoz4fWT6U1soh1p8o1_500.png");
}
</script>
<body>
<img id="theImage" src="http://31.media.tumblr.com/18b5f8f0a00ad01e50f7ae2f513be52d/tumblr_msqcl4iwM01soh1p8o1_500.png">
<p><input type="button" id="theButton" value="click me!" onclick="pictureChange()"></p>
</body>
</html>

4条回答
家丑人穷心不美
2楼-- · 2019-05-28 05:35

You missed the quotes in .getElementById('theImage')

 function pictureChange()
    {
    document.getElementById('theImage').src="http://31.media.tumblr.com/fca646cd8fe87906e605ad7e8d039903/tumblr_mmoz4fWT6U1soh1p8o1_500.png";
    }
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劫难
3楼-- · 2019-05-28 05:41

Add " to getElementById argument and remove ) at the end of the line:

<script>
    function pictureChange()
    {
          document.getElementById("theImage").src="http://31.media.tumblr.com/fca646cd8fe87906e605ad7e8d039903/tumblr_mmoz4fWT6U1soh1p8o1_500.png";
    }
</script>

http://jsfiddle.net/cDd8J/ - here. It works.

theImage is just id of the element, not variable, so you have to put it in quotes.

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Lonely孤独者°
4楼-- · 2019-05-28 05:43

There are lot of ways you could try.Calling the function using inline attributes or calling it using the id in your script.Here's one ,

theButton.onclick = function pictureChange()
{
   document.getElementById("theImage").src="http://31.media.tumblr.com/fca646cd8fe87906e605ad7e8d039903/tumblr_mmoz4fWT6U1soh1p8o1_500.png";
}

Demo

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走好不送
5楼-- · 2019-05-28 05:43

You can use inline HTML: <img src="img1.jpg" onclick="this.src='img2.jpg'"> works best.

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