js给dropdownlist添加选项的小例子_javascript技巧

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Js代码


////创建新目录
function newDir() {
var txt = document.getElementById("newDirtxt");
var dirname = txt.value;
if (dirname) {
alert("请填写目录名");
} else {
$.ajax({
type: "Post",
url: "/center/directorynew",
async: false,
data: { dirname: dirname },
success: function(msg) {
if (msg.length < 40) {
var DirectoryID = document.getElementById("DirectoryID");
var tOption = document.createElement("Option");
tOption.text = dirname;
tOption.value = msg;
DirectoryID.appendChild(tOption);
txt.value = "";
alert("增加成功");

} else {
alert("增加失败");
}
}
});
}//else
}



后台代码

返回刚刚插入的目录的id字符串