Question

我想根据所选的下拉列表更改提交按钮ID而不提交。如果我选择了Live Bookmark，提交按钮的ID应该更改为A1而不提交。我怎么能这样做。可以有人建议。下面是我的代码< / p>

<form class="form-horizontal" role="form" action="" method="post" enctype="multipart/form-data">
           <div class="row">
              <div class="col-md-12">
                 <div class="form-group">
                    <div class="col-md-9">
                       <select id="one" name="sub" class="form-control" onchange="myFunction()">
                          <option value="0">Select</option>
                          <option value="H1" id="A1" >Live Bookmark</option>
                          <option value="H2" id="A2">My Yahoo</option>
                          <option value="H3" id="A3">My Free Dictionary</option>
                          <option value="H4" id="A4">My Daily Rotation</option>
                          <option value="H5" id="A5">My Podnova</option>
                       </select>
                    </div>
                 </div>

                 <div class="form-group">
                    <div class="col-md-9">
                       <button type="submit" name="submit" id="$id">Subscribe Now</button>
                    </div>
                 </div>

              </div>
           </div>
        </form>

Answer 1

您可以在选择下拉列表中收听change事件并动态分配id属性，如下面的代码段所示：

$('document').ready(function(){

$('#one').on('change', function() {
  $('button[type=submit]').attr('id', $(this).find(":selected").attr('id'));
  console.log('Button Id is '+ $(this).find(":selected").attr('id'));
})

})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.js"></script>
<form class="form-horizontal" role="form" action="" method="post" enctype="multipart/form-data">
           <div class="row">
              <div class="col-md-12">
                 <div class="form-group">
                    <div class="col-md-9">
                       <select id="one" name="sub" class="form-control">
                          <option value="0">Select</option>
                          <option value="H1" id="A1" >Live Bookmark</option>
                          <option value="H2" id="A2">My Yahoo</option>
                          <option value="H3" id="A3">My Free Dictionary</option>
                          <option value="H4" id="A4">My Daily Rotation</option>
                          <option value="H5" id="A5">My Podnova</option>
                       </select>
                    </div>
                 </div>

                 <div class="form-group">
                    <div class="col-md-9">
                       <button type="submit" name="submit" id="$id">Subscribe Now</button>
                    </div>
                 </div>

              </div>
           </div>
        </form>

Answer 2

function myFunction(id){
  var thisElem = $("#"+id);
  var selectedValue = $.trim(thisElem.val());
  //console.log(selectedValue);
   $("button[type=submit]").attr("id", selectedValue);
}

<select id="one" name="sub" class="form-control" onchange="myFunction(this.id);">
  <option value="0">Select</option>
  <option value="H1" id="A1" >Live Bookmark</option>
  <option value="H2" id="A2">My Yahoo</option>
  <option value="H3" id="A3">My Free Dictionary</option>
  <option value="H4" id="A4">My Daily Rotation</option>
  <option value="H5" id="A5">My Podnova</option>
  </select>

<button type="submit" name="submit" id="$id">Subscribe Now</button>

Answer 3

如果想要通过jquery事件执行此操作，请在提交按钮中添加一个类并删除onchange="myFunction()"。否则将该代码放入myFunction。

<button type="submit" name="submit" class="test" id="">Subscribe Now</button>
$(document).ready(function () {
    $("#one").change(function () {
        $(".test").attr('id', $(this).children(":selected").attr("id"));
    })
})

这是工作example

Answer 4

纯javascript的替代方式：

放置JavaScript函数以更改HTML页面的<head>中的ID。

<head>
<script>
    function myFunction(new_id) {
        if (new_id == 0) {
            return // this is so that if "select" is selected then id won't change
        }
        // change id
        document.getElementsByName("submit")[0].id = new_id;
    }
</script>
</head>

然后按照以下方式修改<select>，以便在选择更改时使用新ID调用该函数。

<select id="one" name="sub" class="form-control" onchange="myFunction(this.value);">

整个代码：

＆＃13;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title> new document </title>
    <meta name="description" content="" />
    <script>
        function myFunction(new_id) {
            if (new_id == 0) {
                return;
            }
            document.getElementsByName("submit")[0].id = new_id;
            
            // test new id
            // remove this after testing
            alert(document.getElementById(new_id).id);
        }
    </script>
</head>

<body>

<form class="form-horizontal" role="form" action="" method="post" enctype="multipart/form-data">
           <div class="row">
              <div class="col-md-12">
                 <div class="form-group">
                    <div class="col-md-9">
                       <select id="one" name="sub" class="form-control" onchange="myFunction(this.value)">
                          <option value="0">Select</option>
                          <option value="H1" id="A1" >Live Bookmark</option>
                          <option value="H2" id="A2">My Yahoo</option>
                          <option value="H3" id="A3">My Free Dictionary</option>
                          <option value="H4" id="A4">My Daily Rotation</option>
                          <option value="H5" id="A5">My Podnova</option>
                       </select>
                    </div>
                 </div>

                 <div class="form-group">
                    <div class="col-md-9">
                       <button type="submit" name="submit" id="">Subscribe Now</button>
                    </div>
                 </div>

              </div>
           </div>
</form>

</body>

</html>

＆＃13;

如何根据选定的下拉列表更改提交按钮ID？

4 个答案: