JS使用json数据自动填充表单

<title>JS使用json数据自动填充表单示例</title>
<form name="myform">
text:<input type="text" name="text" /><br />
textarea:<textarea name="textarea"></textarea><br />
radio:<input type="radio" name="radio" value="radio1" />radio1　<input type="radio" name="radio" value="radio2" />radio2<br />
checkbox:<input type="checkbox" name="checkbox" value="checkbox1" />checkbox1　<input type="checkbox" name="checkbox" value="checkbox2" />checkbox2　<input type="checkbox" name="checkbox" value="checkbox3" />checkbox3<br />
checkbox-signle:<input type="checkbox" name="checkbox1" value="checkbox1" />checkbox1<br />
select-single:<select name="selsg"><option value="">...</option><option value="1">1</option><option value="2">2</option><option value="3">3</option></select><br />
select-multiple:<select name="selmul" multiple><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option></select>
</form>
<script>
    function fillData(f, kv) {
        var attr, el, v, vs;
        for (attr in kv) {
            el = f[attr];
            if (el) {
                v = kv[attr];
                switch (el.type||el[0].type) {
                    case 'text':
                    case 'textarea':
                    case 'select-one':
                        el.value = v;
                        break;
                    case 'select-multiple':
                        vs = ',' + v.join() + ',';//前后加逗号分隔
                        for (var i = el.options.length - 1; i >= 0; i--)
                            if (vs.indexOf(',' + el.options[i].value + ',') != -1) el.options[i].selected = true;
                        break;
                    case 'radio':
                    case 'checkbox':
                        var isRadio = el.type == 'radio';
                        //前后加逗号分隔
                        if (isRadio) vs = ',' + v.join() + ',';
                        else vs = ',' + v + ',';
                        if (typeof el.length == 'number') {//多个
                            for (var i = el.length - 1; i >= 0; i--)
                                if (vs.indexOf(',' + el[i].value + ',') != -1) { el[i].checked = true; if (isRadio) break; }
                        }
                        else el.checked = el.value == v;//只有一个
                        break;
                }
            }
        }
    }
    ////////////////////测试
    //数据，键名称和表单输入对象同名
    var data = {
        text: 'text value',
        textarea: 'textarea value',
        radio: 'radio2',
        checkbox: ['checkbox1','checkbox3'],//复选框，数组,
        checkbox1: ['checkbox1'],
        selsg: '3',
        selmul:['2','4']//select多选，数组
    };
    fillData(document.myform, data);
</script>