Member Avatar for Xessa

I want to avoid user to press " and ' characters.

What must i do in keyup event?

  • 4 Contributors
  • 3 Replies
  • 105 Views
  • 1 Day Discussion Span
  • Latest Post Latest Post by essential
Member Avatar for almostbob

It is better to validate the form on submission, as well
character strings can equal representations of the character you dont want, "

<script type='text/javascript'>
function isAlphabet(elem, helperMsg){
 var alphaExp = /^["']+$/;
 if(elem.value.match(alphaExp)){
  alert(helperMsg);
  elem.focus();
 return true;
}else{ return false; }
}
</script>
<form>
Letters Only: <input type='text' id='letters' onkeyup="isAlphabet(document.getElementById('letters'), 'Cannot contain quote characters')" />
</form>

Fragment only, not checked for long strings

Member Avatar for itsjareds

You could also try:

<html>
<body>
<script type="text/javascript">
function notAQuote(e) {
	var keynum;
	var keychar;
	var numcheck;

	if(window.event) // IE
		keynum = e.keyCode;
	else if(e.which) // Netscape/Firefox/Opera
		keynum = e.which;

	var notQuote;

	switch (keynum) {
		case 34:
			notQuote = false;
			break;
		case 39:
			notQuote = false;
			break;
		default:
			notQuote = true;
	}

	return notQuote;
}
</script>

<form>
<input type="text" onkeypress="return notAQuote(event)" />
</form>

</body>
</html>
commented: thank you. +2
Member Avatar for essential

You can also try this one:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html id="html40L" lang="en">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Style-Type" content="text/css">
<meta http-equiv="Content-Script-Type" content="text/javascript">
<title>X-Window</title>
<style type="text/css">
<!--
input {
   display : block;
   height : 15%;
   letter-spacing : 4px;
   margin : .300em 0 1em 0;
   width : 30%; }  
-->
</style>
<script type="text/javascript">
<!--
var quot = function( sdQuote ) {
var quoted = "";

   sdQuote = (( document.getElementById ) ? document.getElementById( sdQuote ) : document.all[ sdQuote ] );

   filterQ = sdQuote.value.match(/[\"\']+/g); 
   for ( var x = 0; x < filterQ.length; x++ ) {
      if ( filterQ[ x ] ) {
      quoted += "[ " + (( x ) + 1 ) + " " + String( filterQ[ x ] ).fontcolor("blue") + " ] ";
      sdQuote.value = sdQuote.value.replace( filterQ[ x ], "" );
      (( document.getElementById ) ? document.getElementById( "count" ) : document.all.count ).innerHTML = "Invalid Character" + (( filterQ.length > 1 ) ? "s" : "" ) + " : " + quoted;
      continue;
      }
   }
};

//-->
</script>
</head>
<body>
<div id="main">
<form id="testform" name="testform" action="*" onsubmit="return false;">
<div>
<label for="txt">Test Field: <input type="text" id="txt" name="txt" onkeyup="quot(( this.id |= 'txt' ));" value=""></label>
<div id="count"></div>
</div>
</form>
</div>
</body>
</html>
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