javascript对ListBox的增 删

javascript 对ListBox的增 删

假设有2个ListBox，ID分别为lbLeft，lbRight

选中lbLeft里的项添加到lbRight里:

function add()

{

var left;

var right;

left = document.getElementById("lbLeft");

right = document.getElementById("lbRight");

for(var i=0;i<left.length;i++)

{

if(left.options[i].selected)

{

//判断该项是否已经存在

for(j=0;j<right.length;j++)

{

if(right.options[j].value==left.options[i].value)

{

return;

}

}

right.add(new Option(left.options[i].text,left.options[i].value));

}

}

}



删除lbRight里的项：



function del()

{

right=document.getElementById("lbRight");

for(i=right.length-1;i>=0;i--)

{

if(right.options[i].selected)

{

right.remove(i);

}

}

//重新赋值

for(j=0;j<right.length;j++)

{

document.getElementById("txtAllName").value+=right.options[j].text+",";

document.getElementById("txtAllID").value+=right.options[j].value+",";

}

}