js获取光标位置和设置文本框光标位置示例代码_javascript技巧

function setTxt1CursorPosition(i){
var oTxt1 = document.getElementById("txt2");
var cursurPosition=-1;
if(oTxt1.selectionStart){//非IE浏览器
oTxt1.selectionStart=i;
}else{//IE
var range = oTxt1.createTextRange();
range.move("character",i);
range.select();
}
}

function getTa1CursorPosition(){
var evt =window.event?window.event:getTa1CursorPosition.caller.arguments[0];
var oTa1 = document.getElementById("ta1");
var cursurPosition=-1;
if(oTa1.selectionStart){//非IE浏览器
cursurPosition= oTa1.selectionStart;
}else{//IE
var range = oTa1.createTextRange();
range.moveToPoint(evt.x,evt.y);
range.moveStart("character",-oTa1.value.length);
cursurPosition=range.text.length;
}
alert(cursurPosition);
}

function setTa1CursorPosition(i){
var oTa2 = document.getElementById("ta2");
if(oTa2.selectionStart){//非IE浏览器
oTa2.selectionStart=i;
oTa2.selectionEnd=i;
}else{//IE
var range = oTa2.createTextRange();
range.move("character",i);
range.select();
}
}