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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><title>Input placeholders</title><meta http-equiv="Content-type" content="text/html; charset=utf-8" /></head><body> <input type="text" name="" id="myField" value="$" id="myField" /> <input type='text'value="$" onkeypress='validate(event)' /></body></html>function validate(evt) { var theEvent = evt || window.event; var key = theEvent.keyCode || theEvent.which; key = String.fromCharCode( key ); var regex = /[0-9]|\./; if( !regex.test(key) ) { theEvent.returnValue = false; if(theEvent.preventDefault) theEvent.preventDefault(); }}
Output
300px
300px
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