获得TextBox中光标的位置(get the cursor position in a TextBox or InputText)

使用JavaScript实现：

 

function getposition()
{
        var txt1=document.getElementById("TextBox1");
    
        var currentRange=document.selection.createRange();   
        var workRange=currentRange.duplicate();
        txt1.select();
        var allRange=document.selection.createRange();
        var len=0;   
    
        while(workRange.compareEndPoints("StartToStart",allRange)>0)   
        {   
          workRange.moveStart("character",-1);   
          len++;   
        }   
    
        currentRange.select();   
        
        window.alert(len); 
}