往光标所在位置插入值的js代码

复制代码 代码如下:

/** 
  
*往输入域中插入字符串(光标所在位置) 
  
*@param $t document.getElementById('fieldId') 
  
*@param myValue 要插入的值 
  
** 
  
function addSplitToField($t,myValue){ 
  
if (document.selection) { 
  
$t.focus(); 
  
sel = document.selection.createRange(); 
  
sel.text = myValue; 
  
$t.focus(); 
  
}else if($t.selectionStart || $t.selectionStart == '0') { 
  
var startPos = $t.selectionStart; 
  
var endPos = $t.selectionEnd; 
  
var scrollTop = $t.scrollTop; 
  
$t.value = $t.value.substring(0, startPos) + myValue + $t.value.substring(endPos, $t.value.length); 
  
this.focus(); 
  
$t.selectionStart = startPos + myValue.length; 
  
$t.selectionEnd = startPos + myValue.length; 
  
$t.scrollTop = scrollTop; 
  
}else{ 
  
$t.value += myValue; 
  
$t.focus(); 
  
} 
  
}