javascript - 使用 JavaScript 的下拉列表

Question

我有这 3 个下拉列表。我想根据第一个 DDL 中选择的值仅显示 1 个下拉列表。有人可以帮我解决这个问题吗:

HTML:

<div class="field">
                    <label for="message_for">Message For</label>
                    <select id="message_for" name="message_for"         title="Message For" >
                      <option value='shop'>Shops</option>
                      <option value='offers'>Offers</option>
                      <option value='events'>Events</option>
                      <option value='consultancy'>Consultancy</option>
                    </select>
                </div>

                <div class="field1">
                    <label for="message_type">Message Type</label>
                    <select id="offer_type" name="offer_type" title="Offer     Type" >
                      <option value='special'>Special</option>
                      <option value='recommend'>Recommended</option>
                      <option value='day'>Offer of the Day</option>
                      <option value='hot'>Hot Offer</option>
                    </select>
                </div>

                <div class="field2">
                    <label for="message_type">Message Type</label>
                    <select id="shop_type" name="shop_type" title="Shop Type" >
                      <option value='mall'>Mall</option>
                      <option value='warehouse'>Warehouse</option>
                      <option value='food'>Food</option>
                      <option value='banquet'>Banquet</option>
                      <option value='service'>Service</option>
                      <option value='cosmetics'>Cosmetics</option>
                      <option value='fashion'>Fashion</option>
                    </select>
                </div>

                <div class="field3">
                    <label for="message_type">Message Type</label>
                    <select id="event_type" name="event_type" title="Event Type" >
                      <option value='social'>Social</option>
                      <option value='other'>Other</option>
                    </select>
                </div>

意味着如果我在第一个DDL中选择商店，那么第二个DDL应该是DIV field2

Answer 1

基本上，这个想法是使用 jquery 获取 message_for select 的值，并根据其值显示或隐藏其他选择。

$("#message_for").on("change", function(){
    if($(this).val() == "shop"){
        $(".field1").show();
    }
    //here add more cases to show relevant selects
});

我为你创建了这个 jsfiddle - https://jsfiddle.net/guranjanpsingh/h9prdxyy/2/