Trying to modify the text of a document onkeydown is inserting text incorrectly.
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by Benny
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Published on 2010-04-13T18:36:23Z
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2010/04/13
20:43 UTC
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JavaScript
|html
I have the following html:
<html>
<head>
<script>
function myKeyDown()
{
var myDiv = document.getElementById('myDiv');
myDiv.innerHTML = myDiv.innerHTML.replace(/(@[a-z0-9_]+)/gi, '<strong>$1</strong>');
}
function init()
{
document.addEventListener('keydown', myKeyDown, false);
document.designMode = "on";
}
window.onload = init;
</script>
</head>
<body>
<div id="myDiv">
This is my variable name: @varname. If I type here things go wrong...
</div>
</body>
</html>
My goal is to do a kind of syntax highlighting on edit, to highlight variable names that begin with an @ symbol. However, when I edit the document's body, the function runs but the cursor is automatically shifted to the beginning of the body before the keystroke is performed.
My hypothesis is that the keypress event is trying to insert the new character at a specified index, but when I run the replace function the indices get messed up so it defaults the character insertion point to the beginning.
I'm using Firefox to test by the way.
Any help would be appreciated.
Thanks, B.J.
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