[英]JavaScript: using onchange to filter data using a drop-down menu
[英]Using JavaScript to filter a drop down menu
基于此处StackOverflow上的帖子 ,我试图制作一个下拉菜单,其内容取决于另一个下拉菜单的选择。
幸运的是,尽管我最初确实从数据库中获得了下拉菜单选项,但我发现的解决方案非常适用于我的问题。 不幸的是,我似乎无法获得解决方案。
可以从数据库中正确读取两个菜单,然后将其转换为正确的HTML代码。 因此似乎失败的是JavaScript,该JavaScript用于过滤第二个下拉菜单中的选项。 我的代码如下:
<div id="selection">
<?php
// Top level part selection
echo "<select name='firstLevelParts' id='select1'>";
foreach ($category_primary as $category_item):
echo "<option value = '".$category_item['cat_primary_id']."'>".$category_item['cat_primary_name']."</option>";
endforeach;
echo "</select>";
// Second level part selection (This should be updated, based on selection in top level menu)
echo "<select name='secondLevelParts' id='select2'>";
foreach ($category_secondary as $cat_sec_item):
echo "<option value='".$cat_sec_item['cat_secondary_code']."'>".$cat_sec_item['cat_secondary_name']."</option>";
endforeach;
echo "</select>";
?>
</div>
<script>
$("#select1").change(function() {
if(typeof $(this).data('options') === "undefined")){
/*Taking an array of all options-2 and kind of embedding it on the select1*/
$(this).data('options',$('#select2 option').clone());
}
var id = $(this).val();
var options = $(this).data('options').filter('[value=' + id + ']');
$('#select2').html(options);
});
</script>
我真的希望您能帮助我找到我的代码中的缺陷,我真的很烦我。
更新-根据请求,这是生成的HTML代码,我不能真正给您提供页面网址,因为它位于密码保护的后面:
<div id="selection">
<select name='firstLevelParts' id='select1'>
<option value = '1'>Terræn</option>
<option value = '2'>Fundamentsystem</option>
<option value = '3'>Vægsystem</option>
<option value = '4'>Dæksystem</option>
<option value = '5'>Tagsystem</option>
</select>
<select name='secondLevelParts' id='select2'>
<option value='1'>Jordprofil</option>
<option value='2'>Befæstet Areal</option>
<option value='3'>Beplantning</option>
<option value='1'>Fundamentkonstruktion</option>
<option value='2'>Bærelag</option>
<option value='3'>Åbning</option>
<option value='4'>Lukning</option>
<option value='5'>Inddækning</option>
<option value='6'>Afslutning</option>
<option value='7'>Afskærmning</option>
<option value='8'>Fuge</option>
<option value='9'>Samling</option>
<option value='10'>Overflade</option>
</select>
</div>
<script>
$("#select1").change(function() {
if(typeof $(this).data('options') === "undefined")){
/*Taking an array of all options-2 and kind of embedding it on the select1*/
$(this).data('options',$('#select2 option').clone());
}
var id = $(this).val();
var options = $(this).data('options').filter('[value=' + id + ']');
$('#select2').html(options);
});
</script>
$(function() { $('#select').filterByValues( $('.filterElements') ); $('.filterElements').change(); }); jQuery.fn.filterByValues = function(masterSelects) { return this.each(function() { var select = this; var options = []; $(select).find('option').each(function() { options.push({value: $(this).val(), text: $(this).text()}); }); $(select).data('options', options); masterSelects.bind('change', function() { var options = $(select).empty().scrollTop(0).data('options'); var vals=[]; $(masterSelects).each(function(i,e){ vals.push('^'+$.trim($(e).val())+'$' ); }); var search = vals.join('|'); var regex = new RegExp(search,'gi'); $.each(options, function(i) { var option = options[i]; if(option.value.match(regex) !== null) { $(select).append( $('<option>').text(option.text).val(option.value) ); } }); }); }); };
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="selection"> <select name='firstLevelParts' class='filterElements'> <option value = '0'>(Select category)</option> <!-- added --> <option value = '1'>Terræn</option> <option value = '2'>Fundamentsystem</option> <option value = '3'>Vægsystem</option> <option value = '4'>Dæksystem</option> <option value = '5'>Tagsystem</option> </select> <select name='firstLevelPartsB' class='filterElements'> <option value = '0'>(Select category)</option> <!-- added --> <option value = '1'>Terræn</option> <option value = '2'>Fundamentsystem</option> <option value = '3'>Vægsystem</option> <option value = '4'>Dæksystem</option> <option value = '5'>Tagsystem</option> </select> <select name='secondLevelParts' id='select'> <option value='1'>Jordprofil</option> <option value='2'>Befæstet Areal</option> <option value='3'>Beplantning</option> <option value='1'>Fundamentkonstruktion</option> <option value='2'>Bærelag</option> <option value='3'>Åbning</option> <option value='4'>Lukning</option> <option value='5'>Inddækning</option> <option value='6'>Afslutning</option> <option value='7'>Afskærmning</option> <option value='8'>Fuge</option> <option value='9'>Samling</option> <option value='10'>Overflade</option> </select> </div>
我认为,问题出在语法上的简单错误-您的条件中有多余的“)” if(typeof $(this).data('options') === "undefined")){
这是没有此错误的jsfiddle-它起作用: http : //jsfiddle.net/dn7fLny5/
编辑:您可以在DOM准备就绪后附加您的地址,如下所示:
<script>
$(document).ready(function() {
$("#select1").change(function() {
// your code
});
});
</script>
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