Manipulating html page by .js file
Question
I have successfully called the following JavaScript code to populate an image and description using parameters. The image and description are in tags and are called imagePlaceHolder and descriptionPlaceHolder. As I say, this works perfectly.
function changeImage(imgName,descriptiveText)
{
image = document.getElementById('imagePlaceHolder');
image.src = imgName;
text = document.getElementById('descriptionPlaceHolder');
PlaceHolder.innerHTML=descriptiveText;
}
What I now require is to place the javascript in its own file and call it from the HTML page using <script src="xxxx.js"></script>
The problem is that the object in the <div> is not recognized. I need to amend the line
document.getElementById('imagePlaceHolder');
to point to the HTML file containing object to manipulate.
Can anyone advise me of the correct syntax please?
1 answers
solution1
1 2013-10-08 12:57:01
In the HTML file you need to link the javascript file in the header
Eg
<head>
<script src="/scripts/yourjavascript.js" type="text/javascript"></script>
</head>
then do a onload function at the top of your javascript file
window.onload = function(){
changeImage("imgName", "descriptiveText");
}
function changeImage(imgName,descriptiveText)
{
image = document.getElementById('imagePlaceHolder');
image.src = imgName;
text = document.getElementById('descriptionPlaceHolder');
text.innerHTML=descriptiveText;
}
any javascript using document should reference the html document
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