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我在選擇器上使用^來查找所有具有以form1_product開頭的id的選項，以隱藏所有值並將其清除。然後切換到顯示正確的選擇選項。選擇字段清除值，但忽略第一個選項
這是所有的工作，但我有問題是
我如何忽略選項列表中的第一選擇，因爲目前它去除所有的值了。
$(document).ready(function() {
toggleFields();
$("#form1_segment").change(function() {
toggleFields();
});
function toggleFields() {
$("[id^=form1_product]").hide().val(null);
switch ($("#form1_segment").val()) {
case "Food Service":
$("#form1_product").show();
break;
case "Building Care":
$("#form1_product_bc").show();
break;
case "Industry":
$("#form1_product_in").show();
break;
case "Health Care":
$("#form1_product_hc").show();
break;
case "Automotive":
$("#form1_product_auto").show();
break;
case "Aerospace":
$("#form1_product_aero").show();
}
}
});div {
display: block;
margin-bottom: 20px;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="form1_contact" class="contact-form" action="/en-us/contact" method="post">
<div>
<input id="form1_name" name="name" class="contact-form__input" placeholder="Full Name" type="text" required="required" />
</div>
<div>
<input id="form1_email" name="email" class="contact-form__input" placeholder="Email address" type="email" required="required" />
</div>
<div class="split-form">
<label for="form1_segment">Segment</label>
<select id="form1_segment" name="segment" class="test">
<option value="Select a Segment">Select a Segment</option>
<option value="Food Service">Food Service</option>
<option value="Building Care">Building Care</option>
<option value="Industry">Industry</option>
<option value="Health Care">Health Care</option>
<option value="Automotive">Automotive</option>
<option value="Aerospace">Aerospace</option>
</select>
</div>
<div class="split-form last">
<label for="form1_product">Product</label>
<select id="form1_product" name="product" class="test">
<option value="Select a product">Select a product</option>
<option value="S.U.D.S.® Single Use Dispensing System">S.U.D.S.® Single Use Dispensing System</option>
<option value="Chix® SC Foodservice Towels">Chix® SC Foodservice Towels</option>
<option value="Chix® SC Foodservice Towels">Chix® SC Foodservice Towels</option>
<option value="Chix® Pro-Quat®">Chix® Pro-Quat®</option>
<option value="Chix® Pro-Quat®">Chix® Pro-Quat®</option>
<option value="Chix® Pro-Quat®">Chix® Pro-Quat®</option>
<option value="Chix® Pro-Chlor®">Chix® Pro-Chlor®</option>
<option value="Chix® Microfiber Light Cloths">Chix® Microfiber Light Cloths</option>
<option value="Chix® Plus with Microban">Chix® Plus with Microban</option>
<option value="Chix® Towels with Microban">Chix® Towels with Microban</option>
<option value="Chix® Towels">Chix® Towels</option>
<option value="Chix® Plus Sanitizing">Chix® Plus Sanitizing</option>
<option value="Chix® Soft Cloth">Chix® Soft Cloth</option>
<option value="Chix® Tough">Chix® Tough</option>
<option value="Chix® All Day™">Chix® All Day™</option>
<option value="Chix® Wet Wipes">Chix® Wet Wipes</option>
<option value="Chix® Competitive Wet Wipes">Chix® Competitive Wet Wipes</option>
<option value="Chix® Economy Towels">Chix® Economy Towels</option>
<option value="Chix® 3000">Chix® 3000</option>
<option value="Quix® Pretreated Towels">Quix® Pretreated Towels</option>
<option value="Chix® Apron">Chix® Apron</option>
<option value="Worxwell®">Worxwell®</option>
</select>
<select id="form1_product_bc" name="product_bc" class="test">
<option value="Select a product">Select a product</option>
<option value="Dusty™ High Performance Dust Cloth">Dusty™ High Performance Dust Cloth</option>
<option value="Masslinn® Heavy Duty Dust Cloth">Masslinn® Heavy Duty Dust Cloth</option>
<option value="S.U.D.S.® Single Use Dispensing System">S.U.D.S.® Single Use Dispensing System</option>
<option value="Masslinn® Medium Duty Dust Cloth">Masslinn® Medium Duty Dust Cloth</option>
<option value="Masslinn® Light Duty Dust Cloth">Masslinn® Light Duty Dust Cloth</option>
<option value="Economy Duster">Economy Duster</option>
<option value="Masslinn Dusting Tools">Masslinn Dusting Tools</option>
</select>
<select id="form1_product_in" name="product_in" class="test">
<option value="Select a product">Select a product</option>
<option value="Durawipe® Heavy Duty Shop Towel">Durawipe® Heavy Duty Shop Towel</option>
</select>
<select id="form1_product_hc" name="product_hc" class="test">
<option value="Select a product">Select a product</option>
<option value="Worxwell® Towels">Worxwell® Towels</option>
<option value="Soft Cloth Patient Wipes">Soft Cloth Patient Wipes</option>
<option value="Professional Series">Professional Series</option>
<option value="Dwell™ Disinfectant Compatible Healthcare Towels">Dwell™ Disinfectant Compatible Healthcare Towels</option>
<option value="Dusty™ High Performance Dust Cloths">Dusty™ High Performance Dust Cloths</option>
</select>
<select id="form1_product_auto" name="product_auto" class="test">
<option value="No products available">No products available</option>
</select>
<select id="form1_product_aero" name="product_aero" class="test">
<option value="No products available">No products available</option>
</select>
</div>
<div>
<textarea id="form1_message" name="message" class="contact-form__input contact-form__textarea" cols="30" rows="4" placeholder="Message"></textarea>
</div>
<div>
<input id="form1_submit" name="submit" class="btn btn__round subform__button" value="Send Message" type="submit" />
</div>
</form>
使用'：不（）'和'：第一child'排除在每個第一選項中進行選擇：'$（「[ID^= form1_product]：不是（：第一-child）「）。hide（）.val（null）;'另外，動態設置'option'元素的值聽起來像一個壞主意。我很肯定，有一種更簡單，乾燥的方式來做你所需要的。我們需要看到你的HTML確定 –
'$（「[id^form1_product]：not（：first-child）」）。hide（）.val（null）;'我試過了，但它打破了開關盒，並顯示所有的領域 –
我們真的需要看到HTML來幫助你。 –