语源科技BlogJava-小鹏的blog

function getValue(objid,str){

var myField=document.getElementById(""+objid);

//IE浏览器

if (document.selection) {

myField.focus();

sel = document.selection.createRange();

sel.text = str;

sel.select();

}

//火狐/网景浏览器

else if (myField.selectionStart || myField.selectionStart == '0')

{

//得到光标前的位置

var startPos = myField.selectionStart;

//得到光标后的位置

var endPos = myField.selectionEnd;

// 在加入数据之前获得滚动条的高度

var restoreTop = myField.scrollTop;

myField.value = myField.value.substring(0, startPos) + str + myField.value.substring(endPos, myField.value.length);

//如果滚动条高度大于0

if (restoreTop > 0) {

// 返回

myField.scrollTop = restoreTop;

}

myField.focus();

myField.selectionStart = startPos + str.length;

myField.selectionEnd = startPos + str.length;

}

else {

myField.value += str;

myField.focus();

}