根据每个选项的值或 id 过滤选择框

Question

我想使用 jquery 过滤表单中的所有选择框

例如：在第一个选择框中，如果我选择“仅显示1”，我想过滤所有选择元素中的所有选择选项以隐藏值不包含“_1”的任何选项。只应显示带有“_1”的产品值。

如果选择“---Filter---”选项，则所有选择框的默认值应为空白

这是 HTML

<select id="selectlist" name="selectlist" >
    <option value="">---Filter---</option>
    <option value="1">show only 1</option>
    <option value="2">show only 2</option>
    <option value="3">show only 3</option>
</select>
<br><br>
homeware<select id="select1" name="select1">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
<br>
electronics<select id="select2" name="select2">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
    <br>
kitchen<select id="select3" name="select3">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>

很想知道如何使用 Jquery 来实现上述功能

Answer 1

您可以使用contains选择器"option[value*='" + sel + "']"过滤掉值并隐藏。要恢复，请检查所选值是否存在（在您的情况下为空白）并同时显示重置所有选择的值。

例子：

$("#selectlist").on("change", function() {
    var sel = $(this).val(), 
        $ddl = $("#select1, #select2, #select3");
    if (!sel) { // if there is no value means first option is selected
      $ddl.find("option").show(); $ddl.val(''); // show all options and reset the value
    } 
    else {
      $ddl.find("option").hide(); // hide all options
      // show only those options which contain the selected value, 
      // set the selected property to true for the only remaining ones
      $ddl.find("option[value*='" + sel + "']").show().prop('selected', true);
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="selectlist" name="selectlist" >
    <option value="">---Filter---</option>
    <option value="1">show only 1</option>
    <option value="2">show only 2</option>
    <option value="3">show only 3</option>
</select>
<br><br>
homeware<select id="select1" name="select1">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
<br>
electronics<select id="select2" name="select2">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
    <br>
kitchen<select id="select3" name="select3">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>

如果您想将默认值始终保留为空（而不是选择过滤选项），则只需删除最后一个.prop('selected', true).

示例2：

$("#selectlist").on("change", function() {
    var sel = $(this).val(), 
        $ddl = $("#select1, #select2, #select3");
    if (!sel) { // if there is no value means first option is selected
      $ddl.find("option").show(); $ddl.val(''); // show all options and reset the value
    } 
    else {
      $ddl.find("option").hide(); // hide all options
      // show only those options which contain the selected value, 
      // set the selected property to true for the only remaining ones
      $ddl.find("option[value*='" + sel + "']").show();
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="selectlist" name="selectlist" >
    <option value="">---Filter---</option>
    <option value="1">show only 1</option>
    <option value="2">show only 2</option>
    <option value="3">show only 3</option>
</select>
<br><br>
homeware<select id="select1" name="select1">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
<br>
electronics<select id="select2" name="select2">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
    <br>
kitchen<select id="select3" name="select3">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>

笔记：

IE 不允许hide使用options。解决方法是用作.prop('disabled', true)优雅降级。

小提琴： http: //jsfiddle.net/abhitalks/c9a3fLy5/

实施例3：

$("#selectlist").on("change", function() {
    var sel = $(this).val(), 
        $ddl = $("#select1, #select2, #select3");
    if (!sel) { // if there is no value means first option is selected
      $ddl.find("option").show().prop('disabled', false); $ddl.val(''); // show all options and reset the value
    } 
    else {
      $ddl.find("option").hide().prop('disabled', true); // hide all options
      // show only those options which contain the selected value, 
      // set the selected property to true for the only remaining ones
      $ddl.find("option[value*='" + sel + "']").show().prop('selected', true).prop('disabled', false);
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="selectlist" name="selectlist" >
    <option value="">---Filter---</option>
    <option value="1">show only 1</option>
    <option value="2">show only 2</option>
    <option value="3">show only 3</option>
</select>
<br><br>
homeware<select id="select1" name="select1">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
<br>
electronics<select id="select2" name="select2">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>
    <br>
kitchen<select id="select3" name="select3">
    <option value=""></option>
    <option value="product_1">product 1</option>
    <option value="product_2">product 2</option>
    <option value="product_3">product 3</option>
</select>