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How do we limit the length of each row to 30 characters for Text area?

Posted on 2008-06-16
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Last Modified: 2008-06-17
I have a textarea and I need to limit the text area to 30 characters per each row.
suppose if I try to enter more than 30 characters continuously, then the cursor should automatically go to next line at 31st character or it should leave a space, then start entering 31st character.
I have to implement this in classic ASP/JavaScript/VBScript.

any ideas please?

thanks
 
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Question by:ipjyo
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6 Comments
 
LVL 47

Expert Comment

by:apache09
ID: 21798907
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Author Comment

by:ipjyo
ID: 21799020
I think that post will handle to have a line break after so many characters when displayed.

But I dont get how do we handle it to go to a next line or enter space at 31st character while entering the input only. (but not after entering everything)
Basically I wanted the cursor to stop at 31st character and go to a new line.

thanks for your help
0
 
LVL 2

Expert Comment

by:ayus80
ID: 21799051
I think, try using javascript page. I have create sample code, try this.
<html>
<head>
<script language="javascript" type="text/javascript">
 
function limitText(limitField, limitNum) {
 
var v = window.document.myform.nextarea;
 
	if (limitField.value.length > limitNum) {
    v.onFocus = "";
	} 
}
</script>
</head>
 
<body>
<form name="myform">
<textarea name="limitedtextarea" onKeyDown="limitText(this.form.limitedtextarea,30);" 
onKeyUp="limitText(this.form.limitedtextarea,30);">
</textarea>
 
<br><br>
 
<textarea name="nextarea" onFocus="blur()">
</textarea>
 
<br>
</form>
</body>
</html>

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LVL 17

Accepted Solution

by:
gops1 earned 2000 total points
ID: 21799308
Try this code:


<html>
	<head>
		<title>Limit Textarea</title>
		<style type="text/css">
			body{
				font-family:verdana;
				font-size:12px;
			}
 
			textarea{
				font-family:verdana;
				font-size:10px;
				width:300px;
				height:200px
			}
 
		</style>
		<script type="text/javascript">
 
			var alert_title='Input Restriction';
 
			function limitTextarea(el,maxLines,maxChar){
				if(!el.x){
					el.x=uniqueInt();
					el.onblur=function(){clearInterval(window['int'+el.x])}
				}
				window['int'+el.x]=setInterval(function(){
					var lines=el.value.replace(/\r/g,'').split('\n'),
					i=lines.length,
					lines_removed,
					char_removed;
					if(maxLines&&i>maxLines){
						alert('You can not enter\nmore than '+maxLines+' lines');
						lines=lines.slice(0,maxLines);
						lines_removed=1
					}
					if(maxChar){
						i=lines.length;
						while(i-->0)if(lines[i].length>maxChar){
							lines[i]=lines[i].slice(0,maxChar);
							char_removed=1
						}
						if(char_removed)alert('You can not enter more\nthan '+maxChar+' characters per line')
					}
					if(char_removed||lines_removed)el.value=lines.join('\n')
				},50);
			}
 
			function uniqueInt(){
				var num,maxNum=100000;
				if(!uniqueInt.a||maxNum<=uniqueInt.a.length)uniqueInt.a=[];
				do num=Math.ceil(Math.random()*maxNum);
				while(uniqueInt.a.hasMember(num))
					uniqueInt.a[uniqueInt.a.length]=num;
				return num
			}
 
			Array.prototype.hasMember=function(testItem){
			var i=this.length;
			while(i-->0)if(testItem==this[i])return 1;
				return 0
			};
 
			function set_ie_alert(){
				window.alert=function(msg_str){
					vb_alert(msg_str)
				}
			}
 
	</script>
 
</head>
<body>
	This Text box will is going to set the limit of 6 lines and 30 chars per line<br>
	<textarea onfocus="limitTextarea(this,6,30)" wrap="off">some text</textarea>
	<br><br><br>
	This Text box will is going to set the limit of 2 lines and 10 chars per line<br>
	<textarea onfocus="limitTextarea(this,2,10)" wrap="off">some text</textarea>
</body>
</html>

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Author Comment

by:ipjyo
ID: 21804070
I will try this and let you know

thanks for your help
0
 

Author Comment

by:ipjyo
ID: 21804304
It is simply perfect...you made my work easier...
thanks a lot and really appreciate it.

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