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Is there a way in javascript to detect if a word/string was typed in a textarea? I want to detect the string <svg> being inputed in Ace editor or CodeMirror and then do something else. Sounds like it has been implemented but I don't know how.
213
asked Oct 19 '25 03:10
It is possible in Javascript to bind to the key up/down/press/etc events on DOM objects. You have to set the appropriate attribute in the HTML.
<textarea onkeyup='checkText(this.value);'></textarea>
This is the key line that calls the Javascript function with the value (text) of the textarea.
Here is a complete example that demonstrates this use. Listening on Key Up is preferred since the new character will be in the text value before the function is called.
<html>
<head>
<script type='text/javascript' >
var oldText = '';
function checkText(text)
{
if(text.length >= 1)
{
if(text == '<svg>' && text != oldText)
{
alert("<svg> found");
}
}
oldText = text;
}
</script>
<body>
<textarea onkeyup='checkText(this.value);'></textarea>
</body>
</html>
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