即使我选择多个值，Bootstrap 多选仍显示 0 选择

Question

当我选择多个值时，它会显示在标签中选择的0。我认为 Javascript 有问题。看看这张图片：https://photos.app.goo.gl/5Dxwt5gvuE277Uyw9

我还想将所有值存储在我的数据库中。我应该将所有值存储在数组中然后将其传递给 PHP 吗？

$(document).ready(function() {

  $("#multifield1 option:selected").each(function() {

    console.log(this.text);

  });

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/js/bootstrap-multiselect.js"></script>

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/css/bootstrap-multiselect.css">

<div class="col-lg-6">

  <div class="form-group">

    <strong>Area of Interest:</strong>

    <select id="multifield1" class="multiselect-ui form-control" multiple="multiple">

      <option value="X">X</option>

      <option value="Y">Y</option>

      <option value="Z">Z</option>

    </select>

  </div>

</div>

Answer 1

您需要使用onChange事件处理程序：$('#multifield1').multiselect({    onChange: function(option, checked) {        var selectedItems = $("#multifield1 option:selected").length;        console.log('selected items: ' + selectedItems);    }});$('button.btn.btn-info').on('click', function(e) {    var selectedItems = $("#multifield1 option:selected").length;    console.log('Info btn: selected items: ' + selectedItems);});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css"><script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script><script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/js/bootstrap-multiselect.js"></script><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-multiselect/0.9.13/css/bootstrap-multiselect.css"><button type="button" class="btn btn-info">Info</button><div class="col-lg-6">    <div class="form-group">        <strong>Area of Interest:</strong>        <select id="multifield1" class="multiselect-ui form-control" multiple="multiple">            <option value="X">X</option>            <option value="Y">Y</option>            <option value="Z">Z</option>        </select>    </div></div>

Answer 2

此代码放置在您的 $(document).ready 事件处理程序中，这意味着它仅在页面首次加载时执行。我假设最初在页面加载时，尚未选择任何内容。您可以侦听 select onchange 事件并在处理程序中使用您的代码，以便每次更改 select 值时都会运行该代码。$(document).ready(function() {&nbsp; &nbsp; $("#multifield1").on("change", function() {&nbsp; &nbsp; &nbsp; $(this).find("option:selected").each(function() {&nbsp; &nbsp; &nbsp; &nbsp; console.log(this.text);&nbsp; &nbsp; &nbsp; });&nbsp; &nbsp; })});

Answer 3

要将数组中的值发送到 PHP，您应该将“name”设置为您的选择标签的属性如下所示：<select&nbsp;name="test[]"&nbsp;id="multifield1"&nbsp;class="multiselect-ui&nbsp;form-control"&nbsp;multiple="multiple">另外，不要忘记在标签中创建表单并添加提交按钮。