我选择了一个默认值为“选择位置”的下拉列表。选择任何位置后，将显示学校名称的隐藏div。现在，如果从第一个下拉选择中再次选择“选择位置”，我将如何自动隐藏它？
页面来源
<div class="col-lg-12">
<div class="panel panel-default">
<div class="panel-body">
<div class="form-group">
<div class="col-lg-2">
<h3>Primary</h3>
</div>
<div class="col-lg-3">
<div class="form-group">
<label class="control-label">School Location:</label>
<select name="location_primary" class="form-control locationDropdown" id="selection"><option>Choose location</option> <option value="4" rel="4">Abra</option> <option value="5" rel="5">Agusan del Norte</option> <option value="6" rel="6">Agusan del Sur</option> <option value="7" rel="7">Aklan</option> <option value="8" rel="8">Albay</option> <option value="9" rel="9">Antique</option> <option value="10" rel="10">Apayao</option> <option value="11" rel="11">Aurora</option> <option value="12" rel="12">Basilan</option> <option value="13" rel="13">Bataan</option> <option value="14" rel="14">Batanes</option> <option value="15" rel="15">Batangas</option> <option value="16" rel="16">Benguet</option> <option value="17" rel="17">Biliran</option> <option value="18" rel="18">Bohol</option> <option value="19" rel="19">Bukidnon</option> <option value="20" rel="20">Bulacan</option> <option value="21" rel="21">Cagayan</option> </select>
</div>
<div class="form-group schools" id="showDiv">
<label class="control-label">Name Of School </label>
<button class=" add_field_button_primary btn-primary">+</button>
<select name="school_primary" class="form-control ">
<option class="0">Choose school</option> <option value="8" class="63">Abada College</option> <option value="9" class="57">ABE International Coll of Business and Economics-Bacolod</option> <option value="10" class="48">Abuyog Community College</option> <option value="11" class="82">Abubakar Computer Learning Center Foundation</option> <option value="12" class="20">Academia de San Lorenzo Dema Ala</option> <option value="13" class="4">Abraham Dumlao Colleges of the Philippines</option> <option value="14" class="5">ACLC College</option> <option value="15" class="6">Agusan Del Sur State College of Agriculture and Technology</option> <option value="16" class="6">Agusan Del Sur College</option> <option value="17" class="7">Aklan Polytechnic Institute</option> <option value="18" class="7">Aklan Catholic College</option> <option value="19" class="8">Albay Institute of Technology</option> <option value="20" class="8">Bicol University-College of Agriculture and Forestry</option> </select>
</div>
**** **** HTML
<div class="col-lg-12">
<div class="panel panel-default">
<div class="panel-body">
<div class="form-group">
<div class="col-lg-2">
<h3>Primary</h3>
</div>
<div class="col-lg-3">
<div class="form-group">
<label class="control-label">School Location:</label>
<select name="location_primary" class="form-control" id="selection">
<option>Choose location</option>
@foreach($locations as $location)
<option value="{!! $location->location_id!!}" rel="{!! $location->location_id!!}">{!! $location->location_name!!}</option>
@endforeach
</select>
</div>
<div class="form-group" id="showDiv">
<label class="control-label">Name Of School </label>
<button class=" add_field_button_primary btn-primary">+</button>
<select name="school_primary" class="form-control " style="display: none;">
<option class="0">Choose school</option>
@foreach($schol as $school)
<option value="{!! $school->school_id !!}" class="{!! $school->location_id!!}">{!! $school->school_name!!}</option>
@endforeach
</select>
</div>
<div class="input_fields_view_primary">
</div>
</div>
<div class="col-lg-4">
<label class="control-label">SY Graduated:</label>
{!! Form::hidden('sy', '', array('id' => 'sy_hidden')) !!}
<select class="form-control" name="scholar_primary_school_year" id="pri_sy" onchange="educPre(this)">
<?php
$null = 'Null';
$choose = 'Choose A Year';
$Present = 'Present';
echo '<option value='.$null.'>' .$choose.'</option>';
echo '<option value='.$Present.'>' .$Present.'</option>';
for($i=date('Y'); $i > date('Y')-27; $i--){
$x = $i +1;
$y = $i;
echo '<option value='.$y.'-'.$x.'>'.$y.'-'.$x.'</option>';
}?>
</select>
<div class="form-group" id="hidden_div_Pre" style="display: none;" >
<div class="form-group"><br>
<label class="control-label">Select Grade Level:</label>
{!! Form::select('scholar_primary_grade', [
''=>'Choose a Year Level',
'1' => 'Grade-1',
'2' => 'Grade-2',
'3' => 'Grade-3',
'4' => 'Grade-4',
'5' => 'Grade-5',
'6' => 'Grade-6'
],NULL,['class'=>'form-control']) !!}
</div>
<div class="form-group">
<label class="control-label">Grade Point Average (GPA):</label>
{!! Form::text('scholar_primary_gpa',NULL,['class'=>'form-control','placeholder'=>'Enter Your Last Grade Point Average'])!!}
</div>
<div class="form-group">
<label class="control-label">Grade Picture:</label>
{!! Form::file('scholar_primary_grade_proof',['class'=>'form‐control','id'=>'scholar_primary_grade_proof' ]) !!}
</div>
<div class="form-group">
<img id="certificate" src="#" name="scholar_primary_grade_proof" class="img-responsive well" alt="Image" />
</div>
</div>
</div>
<div class="col-lg-3">
<div class="form-group">
<label class="control-label">Award and Recognition:</label>
{!! Form::text('scholar_primary_awards',NULL,['class'=>'form-control','placeholder'=>'Enter Your Award and Recognition','data-role'=>'tagsinput'])!!}
</div>
</div>
</div>
</div>
</div>
</div>
****** ******脚本
$(document).ready(function(){
var $cat = $('select[name=location_primary]'),
$school = $('select[name=school_primary]');
var thisSelect = document.getElementById('selection');
var selection = thisSelect.options[thisSelect.selectedIndex].innerHTML;
if(selection == 'Choose location'){
$('#showDiv').hide();
}
$cat.change(function(){
if(selection == 'Choose location') {
$('#showDiv').show();
}
var $this = $(this).find(':selected'),
rel = $this.attr('rel'),
$set = $school.find('option.' + rel);
if ($set.size() < 0) {
$school.hide();
return;
}
$school.show().find('option').hide();
$set = $school.find('option.0, option.' + rel);
$set.show().first().prop('selected', true);
});
});
答案 0 :(得分：1)
这是你在找什么？很难解密你的代码（与PHP混合），但我认为如果你改变一些名字，这应该有效。
$(document).on("change", ".locationDropdown", function(e) {
//Value of the select
var selectValue = $(this).val();
//If Choose Location is chosen, hide div
if (selectValue == 'Choose location') {
$(".location").hide();
} else {
$(".location").html(selectValue);
$(".location").show();
}
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class='locationDropdown'>
<option value="Choose location" selected>Choose location</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
<div class='location'></div>
答案 1 :(得分：1)
在$cat.change内使用this获取当前选定的值，并根据当前值隐藏和显示div。
$(document).ready(function(){
var $cat = $('select[name=location_primary]'),
$school = $('select[name=school_primary]');
var thisSelect = document.getElementById('selection');
var selection = thisSelect.options[thisSelect.selectedIndex].innerHTML;
if(selection == 'Choose location'){
$('#showDiv').hide();
}
$cat.change(function(){
if($(this).find(":selected").text() == 'Choose location') {
$('#showDiv').hide();
}else {
$('#showDiv').show();
}
var $this = $(this).find(':selected'),
rel = $this.attr('rel'),
$set = $school.find('option.' + rel);
if ($set.size() < 0) {
$school.hide();
return;
}
$school.show().find('option').hide();
$set = $school.find('option.0, option.' + rel);
$set.show().first().prop('selected', true);
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="location_primary" class="form-control" id="selection">
<option>Choose location</option>
<option value="la">LA</option>
<option value="some">some</option>
</select>
<div class="form-group" id="showDiv">
<label class="control-label">Name Of School </label>
<button class=" add_field_button_primary btn-primary">+</button>
<select name="school_primary" class="form-control " style="display: none;">
<option class="0">Choose school</option>
<option value="schoool">School</option>
<option value="anotherschoool">Another School</option>
</select>
</div>