js实现在文本框光标处添加字符的方法介绍

所属分类：网络编程 / JavaScript 阅读数： 780

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<script language="javascript" type="text/javascript"> 
function Button4_onclick(obj) { 
obj.focus(); 
var rng=document.selection.createRange(); 
rng.setEndPoint("StartToStart",obj.createTextRange()); 
var eng=document.selection.createRange(); 
eng.setEndPoint("EndToEnd",obj.createTextRange()); 
var kone = document.getElementByIdx("Text1"); 
kone.value=rng.text + "插入字符" + eng.text; 
} 
</script> 
<input id="Text1" type="text" value="1235467890"/> 
<input id="Button4" type="button" 
value="button" onclick="return Button4_onclick(Text1)" /> 

复制代码代码如下:

 
<%@ Page Language="C#" AutoEventWireup="true" AspCompat="true" CodeBehind="WebForm1.aspx.cs" 
Inherits="SJLERP.WebForm1" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<script type="text/javascript"> 
function setCaret(textObj) { 
if (textObj.createTextRange) { 
textObj.caretPos = document.selection.createRange().duplicate(); 
} 
} 
function insertAtCaret(textObj, textFeildValue) { 
if (document.all) { 
if (textObj.createTextRange && textObj.caretPos) { 
var caretPos = textObj.caretPos; 
caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? textFeildValue + ' ' : textFeildValue; 
} else { 
textObj.value = textFeildValue; 
} 
} else { 
if (textObj.setSelectionRange) { 
var rangeStart = textObj.selectionStart; 
var rangeEnd = textObj.selectionEnd; 
var tempStr1 = textObj.value.substring(0, rangeStart); 
var tempStr2 = textObj.value.substring(rangeEnd); 
textObj.value = tempStr1 + textFeildValue + tempStr2; 
} else { 
alert("This version of Mozilla based browser does not support setSelectionRange"); 
} 
} 
} 
</script> 
<form id="form1" action="" onsubmit="" method="post" enctype="text/plain"> 
<p> 
<textarea name="tarea" rows="" cols="" style="width:300px;height:120px;" 
onselect="setCaret(this);" 
onclick="setCaret(this);" 
onkeyup="setCaret(this);" >例子例子例 Forget Never 子例子例子 asp.net </textarea> 
<br/><br/> 
<input type="text" name="textfield" style="width:220px;" value="插入FireFox"/> 
<br/> 
<input type="button" value="插入" 
onclick="insertAtCaret(this.form.tarea,this.form.textfield.value);"/> 
</p> 
</form> 
</html> 