客观的：
基于此处找到的示例。getData()使用 ajax 调用在函数中解析的数据填充相关下拉列表。目前，我的示例正在处理ajax-mocks.js文件中的静态数据，但我无法理解如何将数据正确解析到下拉列表中，以及如何像之前使用示例 mockjax 数据调用那样填充其他下拉列表。
资源：
函数.php
将 HTML 渲染到 woocommerce 前端产品页面
function add_custom_toga_fields() {
if( has_term('toga', 'product_cat' ) ) {
?>
<p class="label-description"><span>1. Details</span></p>
<table id="graduation" class="custom-fields .bs-docs-example" cellspacing="0">
<tbody>
<tr>
<td class="label"><label for="institution">Institution<span class="required">*</span></label></td>
<td class="value">
<select name="institution" id="institution" class="step1 select2">
<option value="">Select institution</option>
</select>
</td>
</tr>
<tr>
<td class="label"><label for="level">Level of Award<span class="required">*</span></label></td>
<td class="value">
<select name="level" id="level" class="step2 select2">
<option value="">Select level</option>
</select>
</td>
</tr>
<tr>
<td class="label"><label for="faculty">Faculty<span class="required">*</span></label></td>
<td class="value">
<select name="faculty" id="faculty" class="step3 select2">
<option value="">Select Faculty</option>
</select>
</td>
</tr>
<tr>
<td class="label"><label for="ceremony-date">Ceremony Date<span class="required">*</span></label></td>
<td class="value">
<input name="ceremony" type="text" id="ceremony">
</td>
</tr>
<tr>
<td>
<h4>Matches <img src="<?php echo get_stylesheet_directory_uri(); ?>/assets/icons/ajax-loader.gif" data-bind="visible: loading" /></h4>
<ul class="colour-results-list" data-bind="foreach: colours, visible: colours().length > 0">
<li style="background: red;">
<span class="colour-hat" data-bind="text: colour" style="background: yellow;"></span>
</li>
</ul>
</td>
</tr>
</tbody>
</table>
<?php
}
}
add_action( 'woocommerce_before_variations_form', 'add_custom_toga_fields' );
类系统-public.php
从数据库中获取数据并将其处理为正确的格式
public function get_data() {
global $wpdb;
$result = array();
$records = $wpdb->get_results("CALL get_json_data");
foreach($records as $record) {
$obj = new stdClass();
$obj->institution = $record->universityid;
$obj->level = $record->levelid;
$obj->faculty = [];
$faculties = $wpdb->get_results("CALL get_courses_and_colour_by_university_and_level($obj->institution, $obj->level)");
foreach($faculties as $faculty) {
$facObj->name = $faculty->name;
array_push($obj->faculty, $facObj->name);
}
array_push($result, $obj);
}
echo json_encode($result);
wp_die();
}
自定义dropdown.js
构建依赖级联下拉菜单
jQuery(document).ready(function() {
// Apply Select 2
jQuery(".select2").select2();
function getInstitutions() {
var results = [
{ label: 'Test 1', value: 1 },
{ label: 'Test 2', value: 2 },
{ label: 'Test 3', value: 3 },
]
return results;
}
function viewmodel() {
this.colours = ko.observableArray([]);
this.loading = ko.observable(false);
}
var graduation = new viewmodel();
ko.applyBindings(graduation, document.getElementById('graduation'));
jQuery('#graduation').cascadingDropdown({
selectBoxes: [
{
selector: '.step1',
source: getInstitutions()
},
{
selector: '.step2',
requires: ['.step1'],
source: function(request, response) {
jQuery.getJSON('/api/levels', request, function(data) {
var selectOnlyOption = data.length <= 1;
response(jQuery.map(data, function(item, index) {
return {
label: item,
value: item,
selected: selectOnlyOption
};
}));
});
}
},
{
selector: '.step3',
requires: ['.step1', '.step2'],
requireAll: true,
source: function(request, response) {
jQuery.getJSON('/api/faculties', request, function(data) {
response(jQuery.map(data, function(item, index) {
return {
label: item,
value: item,
selected: index == 0
};
}));
});
},
onChange: function(event, value, requiredValues, requirementsMet) {
if(!requirementsMet) return;
graduation.loading(true);
var ajaxData = requiredValues;
ajaxData[this.el.attr('name')] = value;
jQuery.getJSON('/api/colours', ajaxData, function(data) {
graduation.colours(data);
graduation.loading(false);
});
}
}
]
});
});
ajax-mock.js
一些模拟ajax调用的mockjax数据
// Some mockjax code to simulate Ajax calls
var colourList = [
{
faculty: [8, 16],
institution: 2,
level: "Bachelors",
colour: 'Red'
},
{
faculty: [32, 64],
institution: 3,
level: "Doctorate",
colour: 'Green'
},
{
institution: 2,
level: "Bachelors",
faculty: [8],
colour: 'Blue'
},
{
faculty: [16],
institution: 3,
level: "Masters",
colour: 'Purple'
},
{
faculty: [16],
institution: 3,
level: "Masters",
colour: 'Pink'
},
{
faculty: [16, 32],
institution: 1,
level: "Masters",
colour: 'Brown'
},
{
level: 2,
faculty: ["Msc Business Information System Management"],
institution: 3,
colour: 'Gray'
}
];
getData();
function getData() {
var data = { 'action': 'get_data' };
var deferred = new jQuery.Deferred();
return jQuery.post(ajaxurl, data, function(response) {
var obj = JSON.parse(response);
results = obj;
}).done(function() {
return deferred.resolve(results);
}).fail(function() {
});
}
function arrayIntersect(a, b) {
return jQuery.grep(a, function(i) {
return jQuery.inArray(i, b) > -1;
});
}
function arrayToInt(array) {
var output = [];
for(var i=0;i<array.length;i++) {
if(array[i] && !isNaN(+array[i])) output.push(+array[i]);
}
return output;
}
function arrayToFloat(array) {
var output = [];
for(var i=0;i<array.length;i++) {
if(array[i] && !isNaN(parseFloat(array[i]))) output.push(parseFloat(array[i]));
}
return output;
}
function getColours(institution, level, faculty) {
var _institution = arrayToFloat([].concat(institution)),
_level = arrayToInt([].concat(level)),
_faculty = arrayToInt([].concat(faculty));
return jQuery.grep(colourList, function(item, index) {
var i = true, l = true, f = true;
if(_institution.length) {
i = jQuery.inArray(item.institution, _institution) > -1;
}
if(_level.length) {
l = jQuery.inArray(item.level, _level) > -1;
}
if(_faculty.length) {
f = arrayIntersect(item.faculty, _faculty).length > 0;
}
return !!(i && l && f);
});
}
function getLevels(level, faculty) {
var colours = getColours(null, level, faculty);
var institutions = jQuery.map(colours, function(colour) { return colour.institution; });
institutions.sort(asc);
return arrayUnique(institutions);
}
function getUniversities(institution, faculty) {
var colours = getColours(institution, null, faculty);
var levels = jQuery.map(colours, function(colour) { return colour.level; });
levels.sort(asc);
return arrayUnique(levels);
}
function getFaculties(institution, level) {
var colours = getColours(institution, level, null);
var faculties = [];
jQuery.each(colours, function(index, item) {
faculties = arrayUnique(faculties.concat(item.faculty));
});
faculties.sort(asc);
return faculties;
}
function arrayUnique(array) {
var a = array.concat();
for(var i=0; i<a.length; ++i) {
for(var j=i+1; j<a.length; ++j) {
if(a[i] === a[j])
a.splice(j--, 1);
}
}
return a;
}
function asc(a, b) {
return a - b;
}
jQuery.mockjax({
url: ajaxurl,
contentType: 'application/json; charset=utf-8',
responseTime: 1000,
response: function(settings) {
this.responseText = JSON.stringify(getLevels(settings.data.level, settings.data.faculty));
}
});
jQuery.mockjax({
url: '/api/levels',
contentType: 'application/json; charset=utf-8',
responseTime: 1000,
response: function(settings) {
this.responseText = JSON.stringify(getUniversities(settings.data.institution, settings.data.faculty));
}
});
jQuery.mockjax({
url: '/api/faculties',
contentType: 'application/json; charset=utf-8',
responseTime: 1000,
response: function(settings) {
this.responseText = JSON.stringify(getFaculties(settings.data.institution, settings.data.level));
}
});
jQuery.mockjax({
url: '/api/colours',
contentType: 'application/json; charset=utf-8',
responseTime: 1000,
response: function(settings){
this.responseText = JSON.stringify(getColours(settings.data.institution, settings.data.level, settings.data.faculty));
}
});
管理员-Ajax.php
从 admin-ajax.php 收到的响应
额外说明
我一直在试图弄清楚如何用来自服务器的 ajax 调用替换 Mockjax 调用，但我还没有完全理解所有使用的技术。
真诚地感谢你，感谢那些花时间帮助我引导我走向正确方向的人。在这一点上，非常感谢您的帮助。