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I have a JS function that gets the width of a div on my page:
function getWidth() {
var container = document.getElementsByClassName('tag');
var message = "The width of the contents width padding: " + container.width + "px.\n";
alert(message);
}
The function doesn't run until page is loaded:
<body onload="getWidth()">
And the div is defined in CSS as a percentage, with a max-width of 900px, which is what the output should be. But instead, I'm getting this alert:
The width of the contents width padding: undefinedpx.
I've looked around for an answer, but it looks like this should be work. Any reason why it's not working?
803
getElementsByClassName returns a collection of nodes.
You are acting like it is one.
You would need to select the index.
var container = document.getElementsByClassName('tag')[0];
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