仅在选择特定选项时才显示输入字段 [英] Show input field only if a specific option is selected

问题描述

我试图制作一个表单，用于检查是否从select标签中选择了某个选项。这里是我目前的HTML：

I'm trying to make a form which checks if a certain option is selected from a "select" tag. Here is my current HTML:

<select onchange="yesnoCheck()">
    <option id="noCheck" value="">Valitse automerkkisi</option>
    <option id="noCheck" value="lada">Lada</option>
    <option id="noCheck" value="mosse">Mosse</option>
    <option id="noCheck" value="volga">Volga</option>
    <option id="noCheck" value="vartburg">Vartburg</option>
    <option id="yesCheck" value="other">Muu</option>
</select>

这是div元素，在选择Muu后应该可见：

This is the div element which should become visible after "Muu" is selected:

<div id="ifYes" style="display: none;">
    <label for="car">Muu, mikä?</label> <input type="text" id="car" name="car" /><br />
</div>

以下是我尝试使用的JavaScript：

And here is the JavaScript I'm trying to use:

<script type="text/javascript">
    function yesnoCheck() {
        if (document.getElementById("yesCheck").checked) {
            document.getElementById("ifYes").style.display = "block";
        } else {
            document.getElementById("ifYes").style.display = "none";
        }
    }
</script>

但它不工作...

推荐答案

这里你去：

<select onchange="yesnoCheck(this);">
    <option value="">Valitse automerkkisi</option>
    <option value="lada">Lada</option>
    <option value="mosse">Mosse</option>
    <option value="volga">Volga</option>
    <option value="vartburg">Vartburg</option>
    <option value="other">Muu</option>
    </select>

    <div id="ifYes" style="display: none;">
    <label for="car">Muu, mikä?</label> <input type="text" id="car" name="car" /><br />
    </div>
    <script>
    function yesnoCheck(that) {
        if (that.value == "other") {
            alert("check");
            document.getElementById("ifYes").style.display = "block";
        } else {
            document.getElementById("ifYes").style.display = "none";
        }
    }
</script>

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