dojo_app/js/library/dijit/form/SimpleTextarea.js

define([
	"dojo/_base/declare", // declare
	"dojo/dom-class", // domClass.add
	"dojo/sniff", // has("ie") has("opera")
	"./TextBox"
], function(declare, domClass, has, TextBox){

	// module:
	//		dijit/form/SimpleTextarea

	return declare("dijit.form.SimpleTextarea", TextBox, {
		// summary:
		//		A simple textarea that degrades, and responds to
		//		minimal LayoutContainer usage, and works with dijit/form/Form.
		//		Doesn't automatically size according to input, like Textarea.
		//
		// example:
		//	|	<textarea data-dojo-type="dijit/form/SimpleTextarea" name="foo" value="bar" rows=30 cols=40></textarea>
		//
		// example:
		//	|	new SimpleTextarea({ rows:20, cols:30 }, "foo");

		baseClass: "dijitTextBox dijitTextArea",

		// rows: Number
		//		The number of rows of text.
		rows: "3",

		// rows: Number
		//		The number of characters per line.
		cols: "20",

		templateString: "<textarea ${!nameAttrSetting} data-dojo-attach-point='focusNode,containerNode,textbox' autocomplete='off'></textarea>",

		postMixInProperties: function(){
			// Copy value from srcNodeRef, unless user specified a value explicitly (or there is no srcNodeRef)
			// TODO: parser will handle this in 2.0
			if(!this.value && this.srcNodeRef){
				this.value = this.srcNodeRef.value;
			}
			this.inherited(arguments);
		},

		buildRendering: function(){
			this.inherited(arguments);
			if(has("ie") && this.cols){ // attribute selectors is not supported in IE6
				domClass.add(this.textbox, "dijitTextAreaCols");
			}
		},

		filter: function(/*String*/ value){
			// Override TextBox.filter to deal with newlines... specifically (IIRC) this is for IE which writes newlines
			// as \r\n instead of just \n
			if(value){
				value = value.replace(/\r/g, "");
			}
			return this.inherited(arguments);
		},

		_onInput: function(/*Event?*/ e){
			// Override TextBox._onInput() to enforce maxLength restriction
			if(this.maxLength){
				var maxLength = parseInt(this.maxLength);
				var value = this.textbox.value.replace(/\r/g, '');
				var overflow = value.length - maxLength;
				if(overflow > 0){
					var textarea = this.textbox;
					if(textarea.selectionStart){
						var pos = textarea.selectionStart;
						var cr = 0;
						if(has("opera")){
							cr = (this.textbox.value.substring(0, pos).match(/\r/g) || []).length;
						}
						this.textbox.value = value.substring(0, pos - overflow - cr) + value.substring(pos - cr);
						textarea.setSelectionRange(pos - overflow, pos - overflow);
					}else if(this.ownerDocument.selection){ //IE
						textarea.focus();
						var range = this.ownerDocument.selection.createRange();
						// delete overflow characters
						range.moveStart("character", -overflow);
						range.text = '';
						// show cursor
						range.select();
					}
				}
			}
			this.inherited(arguments);
		}
	});
});