原生动态创建select的方案--兼容IE

2018-06-04

一个兼容到IE的动态创建select的方案。

1.动态创建select

function createSelect(){
    var mySelect = document.createElement("select");
    mySelect.id = "mySelect";
    document.body.appendChild(mySelect);
}

2.添加选项option

function addOption(){
    //根据id查找对象，
    var obj = document.getElementById('mySelect');
    //添加一个选项
    obj.add(new Option("文本","值")); //这个只能在IE中有效
    obj.options.add(new Option("text","value")); //这个兼容IE与firefox
}

3.删除所有选项option

function removeAll(){
    var obj = document.getElementById('mySelect');
    obj.options.length = 0;
}

4.删除一个选项option

function removeOne(){
    var obj = document.getElementById('mySelect');
    //index,要删除选项的序号，这里取当前选中选项的序号
    var index = obj.selectedIndex;
    obj.options.remove(index);
}

5.获得选项option的值

var obj = document.getElementById('mySelect');
var index = obj.selectedIndex; //序号，取当前选中选项的序号
var val = obj.options[index].value;

6.获得选项option的文本

var obj = document.getElementById('mySelect');
var index = obj.selectedIndex; //序号，取当前选中选项的序号
var val = obj.options[index].text;

7.修改选项option

var obj = document.getElementById('mySelect');
var index = obj.selectedIndex; //序号，取当前选中选项的序号
obj.options[index] = new Option("新文本","新值");

8.删除select

function removeSelect(){
    var mySelect = document.getElementById("mySelect");
    mySelect.parentNode.removeChild(mySelect);
}

整个实例的完整代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html">
    <head>
    <script language=JavaScript>
        function $(id) {
            return document.getElementById(id);
        }

        function show() {
            var selectObj = $("area");
            var myOption = document.createElement("option");
            myOption.setAttribute("value", "10");
            myOption.appendChild(document.createTextNode("上海"));
            var myOption1 = document.createElement("option");
            myOption1.setAttribute("value", "100");
            myOption1.appendChild(document.createTextNode("南京"));
            selectObj.appendChild(myOption);
            selectObj.appendChild(myOption1);
        }

        function choice() {
            var index = $("area").selectedIndex;
            var val = $("area").options[index].getAttribute("value")
            if (val == 10) {
                var i = $("context").childNodes.length - 1;
                var remobj = $("context").childNodes[i];
                remobj.removeNode(true)
                var sh = document.createElement("select")
                sh.add(new Option("浦东新区","101"))
                sh.add(new Option("黄浦区", "102"))
                sh.add(new Option("徐汇区", "103"))
                sh.add(new Option("普陀区", "104"))
                $("context").appendChild(sh)
            }
            else if (val == 100) {
                var i = $("context").childNodes.length - 1;
                var remobj = $("context").childNodes[i];
                remobj.removeNode(true);
                var nj = document.createElement("select");
                nj.add(new Option("玄武区", "201"));
                nj.add(new Option("白下区", "202"));
                nj.add(new Option("下关区", "203"));
                nj.add(new Option("栖霞区","204"));
                $("context").appendChild(nj);
            }
        }

        function calc() {
            var x = $("context").childNodes.length - 1;
            alert(x)
        }

        function remove() {
            var i = $("context").childNodes.length - 1;
            var remobj = $("context").childNodes[i];
            remobj.removeNode(true)
        }
    </script>
    <body>
        <div id="context">
            <select id="area" onchange="choice()"> </select>
        </div>
        <input type=button value="显示" onclick="show()">
        <input type=button value="计算结点" onclick="calc()">
        <input type=button value="删除" onclick="remove()">
    </body>
</html>

改进版：在select中添加、修改、删除option元素

function watch_ini() {
    // 初始
    for (var i = 0; i < arguments.length; i++) {
        var word = document.createElement("OPTION");
        word.text = arguments[i];
        watch.keywords.add(word); // watch. is form name
    }
}
function watch_add(f){
    // 增加
    var word=document.createElement("OPTION");
    word.text = f.word.value;
    f.keywords.add(word);
}
// 但上述 add() 方法只在IE下有效， 为兼容FF和Opera， 对上述代码进行了一下改进， 改动后代码如下：
function watch_ini() {
    // 初始
    for(var i = 0; i < arguments.length; i++){
        var oOption = new Option(arguments[i],arguments[i]);
        document.getElementById("MySelect")[i] = oOption;
    }
}
function watch_add(f) {
    // 增加
    var oOption = new Option(f.word.value,f.word.value);
    f.keywords[f.keywords.length] = oOption;
}

整个实例的完整代码如下：

<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>

<head>
    <title>javascript select options text value</title>
    <meta name="keywords" content="javascript select options text value add modify delete set">
    <meta name="description" content="javascript select options text value add modify delete set">
    <script language="javascript">
        function watch_ini() {
            // 初始
            for (var i = 0; i < arguments.length; i++) {
                var oOption = new Option(arguments[i], arguments[i]);
                document.getElementById("MySelect")[i] = oOption;
            }
        }

        function watch_add(f) {
            // 增加
            var oOption = new Option(f.word.value, f.word.value);
            f.keywords[f.keywords.length] = oOption;
        }

        function watch_sel(f) {
            // 编辑
            f.word.value = f.keywords[f.keywords.selectedIndex].text;
        }

        function watch_mod(f) {
            // 修改
            f.keywords[f.keywords.selectedIndex].text = f.word.value;
        }

        function watch_del(f) {
            // 删除
            f.keywords.remove(f.keywords.selectedIndex);
        }

        function watch_set(f) {
            // 保存
            var set = "";
            for (var i = 0; i < f.keywords.length; i++) {
                set += f.keywords[i].text + ";";
            }
            confirm(set);
        }
    </script>
</head>

<body>
    <form name="watch" method="post" action="">
        <select id="MySelect" name="keywords" size="10" onchange="watch_sel(this.form)"></select>
        <script language="javascript">
            watch_ini("我", "你", "妳", "他", "她", "它", "尔"); // 初始关键词
        </script>
        <input type="text" name="word" />
        <br />
        <input type="button" value="增加" onclick="watch_add(this.form);" />
        <input type="button" value="修改" onclick="watch_mod(this.form);" />
        <input type="button" value="删除" onclick="watch_del(this.form);" />
        <input type="button" value="保存" onclick="watch_set(this.form);" />
    </form>
</body>

</html>

今天调试了一段js，在ie上运行良好，在火狐上调试出现错误，查资料发现

obj.add(new Option("文本","值"));    //这个只能在IE中有效
obj.options.add(new Option("text","value")); //这个兼容IE与firefox

因为这段代码，在网上查资料收藏了这篇文章，实时的温故共勉！！
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