通过复选框切换必填字段 javascript

Question

我已经搜索了一段时间这个问题，这是我想出的，但它不起作用：

<form action="Subscription.php" method="post">
     <label>field1<a style="color:red">*</a></label>
     <input type="text" id="field1" name="field1" pattern="^[A-Za-z -]+$" required>              

     <input type="checkbox" name="checkbox1" onclick="showMe('more'); togglerequirement();">Do you want more?

     <div id="more" style="display:none">
          <label>field2<a style="color:red">*</a></label>
          <input type="text" id="field2" name="field2" pattern="^[A-Za-z -]+$">
     </div>          
     <input type="submit" value="Invia richiesta di registrazione" class="btn" </form>

<script type="text/javascript">
function showMe (box) {
    var chboxs = document.getElementsByName("more");
    var vis = "none";
        if(chboxs[0].checked) {
            vis = "block";
        }
    document.getElementById(box).style.display = vis;
}

function togglerequirement(){
    var checkbox = document.getElementsByName("more");
    var field2= document.getElementsByid("field2");

    if(checkbox[0].checked){
        field2.setAttribute("required", "");
    }else{
        field2.removeAttribute("required");
    }
}
</script>

在你说什么之前我已经尝试过fiedl2.required；这两种方式都行不通。

我能做什么？

Answer 1

您正在尝试查找名为 "more" 的复选框，但它的名称="checkbox1":

<input type="checkbox" name="checkbox1" onclick="showMe('more'); togglerequirement();">

它工作正常，但它在显示时将第二个字段更改为必填，而在隐藏时则不需要。所以你没有看到任何效果。

Not required here.

Required here.

如果我完全理解你的话，试试这个：

<form action="Subscription.php" method="post">
     <label>field1<a style="color:red">*</a></label>
     <input type="text" id="field1" name="field1" pattern="^[A-Za-z -]+$" required>              

     <input type="checkbox" name="more" onclick="showMe('more'); togglerequirement();">Do you want more?

     <div id="more" style="display:none">
          <label>field2<a style="color:red">*</a></label>
          <input type="text" id="field2" name="field2" pattern="^[A-Za-z -]+$">
     </div>          
     <input type="submit" value="Invia richiesta di registrazione" class="btn" </form>

<script type="text/javascript">
function showMe (box) {
    var chboxs = document.getElementsByName("more");
    var vis = "none";
        if(chboxs[0].checked) {
            vis = "block";
        }
    document.getElementById(box).style.display = vis;
}

function togglerequirement(){
    var checkbox = document.getElementsByName("more");
    var field2 = document.getElementById("field2");

    if(checkbox[0].checked){
        field2.setAttribute("required", "");
    }else{
        field2.removeAttribute("required");
    }
}
</script>

通过复选框切换必填字段 javascript

toggle required field via checkbox javascript

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