Limite Textarea, Ligne et Nombre de caractères par ligne

**michelS** · 08/11/2010, 15h18

Bonjour,

je tourne en bourique.

J'ai une zone Textarea. Je voudrais limiter le nomde de caractères par lignes et le nombre de lignes. Evidement, pour faire simple, l'utilisateur va parfois faire un retour à la ligne et parfois non, donc le retour se fera en automatique.
Est-ce possible? Existe-t-il un type de zone le permettant?

Par avance merci.

**SpaceFrog** · 08/11/2010, 15h41

cols rows et maxlength ?

**scourjean** · 08/11/2010, 17h08

Si tu connais jquery :

http://plugins.jquery.com/project/TextareaLineCount

**michelS** · 10/11/2010, 14h00

Bonjour,

Aucune des solutions proposées correspondait au besoin spécifique mais elles m'ont permis d'avoir les pistes pour la solution. De plus, ce n'est pas moi quil lait trouvée mais un de mes collègues. Je mets ici le source en espérant qu'elle pourra servir à d'autres.
Dans tous les cas, merci pour vos pistes.

Code :

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8" /> 
	<title>textarea</title>
	<!--styles START--> 
	<style> 
	html {
		height: 100%; /* Fix height to 100% for IE! */
		font-size: 100.01%; /* Correct font related browserbugs in IE, Opera and Safari. */
	}
	body {
		height: 100%; /* Fix height to 100% for IE! */
		font-family: Times,"Time New Roman",serif;
		font-size: 16px;
		background: #554A46;
	}
	a {
		text-decoration: none;
		font-weight: 700;
		color: #554A46;	
	}
	a:hover {
		color: #D22527;	
	}
	fieldset {
		padding: 1em;
		color: #554A46;
		background: #FFFCFC;
		border: 1px solid #D22527;
	}
	legend {
		display: none;
	}
	#info {
		color: #D22527;
		font-size: .8em;
	}
	label {
		text-transform: lowercase;
		font-variant: small-caps;
		line-height: 1.6em;
	}
	</style>
 
	<!--styles END--> 
 
	<!--javascript START--> 
	<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js" type="text/javascript"></script> 
	<script type="text/javascript"> 
	/*
	 * TextLimit - jQuery plugin for counting and limiting characters and lines for textarea fields
	 * 
	 * Example: jQuery("Textarea").textlimit('span.counter',256,10)
	 */
	jQuery.fn.textlimit=function(counter_el, thelimit_char, thelimit_line, speed) {
		var charDelSpeed = speed || 15;
 
		var that = this[0];
		var t = this;
		var cut = 0;
		var count_lines = countLines(t);
		updateCounter();
 
		function updateCounter(){
			jQuery(counter_el).text('left '+(thelimit_char - that.value.length)+' chars and '+(thelimit_line - count_lines)+' lines');
		};
 
		function countLines(ta){
			// Get the textarea value
			var value = ta.val();
 
			var options = {
				recalculateCharWidth : false,
				chars : "",
				fontAttrs : ["font-family", "font-size", "text-decoration", "font-style", "font-weight"]
			};
			var masterCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
			var counter;
 
			// Build a random collection of characters
			masterCharacters += ".,?!-+;:'\"";
			for (counter = 1; counter <= 12; counter++)
				options.chars += masterCharacters[(Math.floor(Math.random() * masterCharacters.length))];
 
			// Decode chars
			if (!$.isArray(options.chars))
				options.chars = options.chars.split("");
 
			// Generate a span after the textarea with a random ID
			var id = "";
			for (counter = 1; counter <= 10; counter++)
				id += (Math.floor(Math.random() * 10) + 1);
 
			ta.after("<span id='s" + id + "'></span>");
			var span = $("#s" + id);
 
			// Hide the span
			span.hide();
 
			// Apply the font properties of the textarea to the span class
			$.each(options.fontAttrs, function(i, v){
				span.css(v, ta.css(v));
			});
 
			// Get the number of lines
			var lines = value.split("\n");
			var linesLen = lines.length;
 
			var averageWidth;
 
			// Check if the textarea has a cached version of the average character width
			if (options.recalculateCharWidth || ta.data("average_char") == null) {
				// Get a pretty good estimation of the width of a character in the textarea. To get a better average, add more characters and symbols to this list
				var chars = options.chars;
 
				var charLen = chars.length;
				var totalWidth = 0;
 
				$.each(chars, function(i, v){
				span.text(v);
				totalWidth += span.width();
				});
 
				// Store average width on textarea
				ta.data("average_char", Math.ceil(totalWidth / charLen));
			}
 
			averageWidth = ta.data("average_char");
 
			// We are done with the span, so kill it
			span.remove();
 
			// Determine missing width (from padding, margins, borders, etc); this is what we will add to each line width
			var missingWidth = (ta.outerWidth() - ta.width()) * 2;
 
			// Calculate the number of lines that occupy more than one line
			var lineWidth;
			var wrappingCount = 0;
 
			$.each(lines, function(i, v){
				// Calculate width of line
				lineWidth = ((v.length + 1) * averageWidth) + missingWidth;
				// Check if the line is wrapped
				if (lineWidth >= ta.outerWidth()){
					// Calculate number of times the line wraps
					var wrapCount = Math.floor(lineWidth / ta.outerWidth());
					wrappingCount += wrapCount;
				}
			});
 
			return (linesLen + wrappingCount);
		};
 
		this.keypress (function(e){ 
			if( this.value.length >= thelimit_char && e.charCode != '0') {
				e.preventDefault();
			}
		}).keyup (function(e){
			count_lines = countLines(t);
			updateCounter();
			if( count_lines >= thelimit_line ){
				var init = setInterval( 
						function(){
							//console.log("count:"+count_lines+" ; limit:"+thelimit_line);
							if( count_lines <= thelimit_line){ 
								init = clearInterval(init); 
								updateCounter();
							}
							else{ 
								count_lines = count_lines-1;
								that.value = that.value.substring(0,that.value.length-2);
								jQuery(counter_el).text('trimming line...  '+(thelimit_line - count_lines));
							};
						} ,charDelSpeed 
					);
			}
			else if( this.value.length >= thelimit_char ){
				// first, trim the text a bit so the char trimming won't take forever
				that.value = that.value.substr(0,thelimit_char+100);
				var init = setInterval( 
						function(){ 
							if( that.value.length <= thelimit_char){ 
								init = clearInterval(init); 
								updateCounter();
							}
							else{ 
								that.value = that.value.substring(0,that.value.length-2); 
								jQuery(counter_el).text('trimming char...  '+(thelimit_char - that.value.length));
							};
						} ,charDelSpeed 
					);
			}
		});
	};
 
	$(function(){ 
		jQuery("#entry").textlimit('#counter',60,3);
		jQuery("#entry2").textlimit('#counter2',60,3);
	});
	</script> 
	<!--javascript END--> 
</head> 
 
<body> 
 
	<!--form START--> 
	<form> 
		<fieldset> 
			<label for="entry">Enter your text</label> <span id="counter"></span><br /> 
			<textarea id="entry" cols="20" rows="5" wrap="soft" style="white-space: wrap;"></textarea> 
			<br><br>
			<label for="entry">Enter your text</label> <span id="counter2"></span><br /> 
			<textarea id="entry2" cols="20" rows="5" wrap="soft" style="white-space: wrap;"></textarea> 
		</fieldset> 
	</form> 
	<!--form END--> 
</body> 
</html>

Limite Textarea, Ligne et Nombre de caractères par ligne

JavaScript

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