使用Javascript中的选项动态添加输入类型选择

Question

我发现在Javascript中添加表单的输入非常简单,但由于某种原因,添加带选项的选择输入无效.选项出现在下拉列表之外.

这是我在jsfiddle中的代码:http://jsfiddle.net/LNVTQ/

这是我的代码内联:

var choices=[];
choices[0]="one";
choices[1]="two";

function addInput(divName){
    var newDiv=document.createElement('div');
    newDiv.innerHTML="<select>";
    for(i=0; i<choices.length; i=i+1){
        newDiv.innerHTML=newDiv.innerHTML+"<option value='"+choices[i]+"'>"+choices[i]+"</option>";
    }
    newDiv.innerHTML=newDiv.innerHTML+"</select>";
    document.getElementById(divName).appendChild(newDiv);
}

和HTML:

<form class="new" method="post" action="/jobs">
    <div id="dynamicInput"></div>
    <input type="button" value="Add" onclick="addInput('dynamicInput');" />
    <input type="button" value="Save" />
</form>

我会接受使用jQuery或只是vanilla Javascript的答案.

Answer 1

Pure Vanila JS

var choices = ["one", "two"];

function addInput(divName) {
    var newDiv = document.createElement('div');
    var selectHTML = "";
    selectHTML="<select>";
    for(i = 0; i < choices.length; i = i + 1) {
        selectHTML += "<option value='" + choices[i] + "'>" + choices[i] + "</option>";
    }
    selectHTML += "</select>";
    newDiv.innerHTML = selectHTML;
    document.getElementById(divName).appendChild(newDiv);
}

<form class="new" method="post" action="/jobs">
    <div id="dynamicInput"></div>
    <input type="button" value="Add" onclick="addInput('dynamicInput');" />
    <input type="button" value="Save" />
</form>

jQuery版本

var choices = ["one", "two"];

function addInput(divName) {
    var select = $("<select/>")
    $.each(choices, function(a, b) {
        select.append($("<option/>").attr("value", b).text(b));
    });
    $("#" + divName).append(select);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<form class="new" method="post" action="/jobs">
    <div id="dynamicInput"></div>
    <input type="button" value="Add" onclick="addInput('dynamicInput');" />
    <input type="button" value="Save" />
</form>

Answer 2

每次设置innerHTML属性时,浏览器都会创建插入内容的DOM元素.

当您添加<select>到innerHTML时,您的浏览器很可能已添加</select>为使其成为有效的html.

然后当你检索它以添加选项时,它会回来<select></select>.

尝试构建整个html字符串以插入普通变量并插入一次.