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Tip of the Day
Language: HTML/JavaScript
Expertise: Beginner
Dec 18, 2006




Constrain an HTML Input Box to Uppercase


Suppose you have the following code:

<input type="text" name="big" style="text-transform:uppercase;">
When you type usd, it will appear on screen as USD, but it will be submitted to the server as usd, since STYLE only affects the appearance, not the original data. Here's the workaround:

<input type="text" name="realbig" style="text-transform:uppercase;" on keyup="javascript:this.value=this.value.toUpperCase();">
This raises another question: why not remove STYLE and just use the JavaScript? The answer is: You can, but users will see the characters "flash" from lower to upper case as they type, which is irritating."

Loekito Mulyadi