noneorone · March 21, 2012 08:46 · Mar 21, 2012
diff --git a/selectText b/selectText
@@ -0,0 +1,34 @@
+	/**
+	 * To choose the specific characters of the content which included in the specific component.
+	 * @param {String} tagName: the name of a tag(eg.textarea,input etc.)
+	 * @param {Object} obj: component
+	 * @param {Integer} begin: the start index
+	 * @param {Integer} end: the end index.
+	 * @author wangmeng
+	 * @date 2011-10-10
+	 */
+	function selectText(tagName, obj, begin, end){
+		if(document.selection){
+			if(obj.tagName == tagName){
+				var i = obj.value.indexOf("\r", 0);
+				while(i != -1 && i < end){
+					end--;
+					if(i < begin){
+						begin --;
+					}
+					i = obj.value.indexOf("\r", i+1);
+				}
+			}
+			var range = obj.createTextRange();
+			range.collapse(true);
+			range.moveStart('character', begin);
+			if(end != undefined){
+				range.moveEnd('character', end-begin);
+			}
+			range.select();
+		}else{
+			obj.selectionStart = begin;
+			var sel_end = (end == undefined) ? begin : end;
+			obj.selectionEnd = Math.min(sel_end, obj.value.length);
+			obj.focus();
+		}