对于Web开发人员来说是新手,所以请多多包涵。在wordpress中,我有一个functions.php文件,其中包含一个函数,该函数会生成图表并以2个日期作为输入。
在我的page-template.php中,我将输入2个日期,然后单击“生成”以使图表重新生成而无需重新加载页面。我有一个不带参数的函数,该函数在页面加载时运行,该按钮将加载另一个函数,该函数在单击按钮时需要两个日期。
Ajax似乎是答案,但是大多数教程使我感到困惑,因为它们的示例要求连接到DB或仅专注于DB。不会通过wordpress函数调用已经完成的函数吗?是否有一种简单的方法可以在传递两个表单值date1,date2时按原样调用我的函数?截断的代码希望可读。
感谢帮助。
page-template.php:第一个功能是带有默认范围的加载功能(来自functions.php文件),然后是日期选择器和按钮。
<?php
lineChartAll_Generate();
echo "<form>
Select Date Range:
<input type='date' name='date1'>
<input type='date' name='date2'>
</form>";
?>
functions.php:使用WP数据库函数将select运行到一个变量中,然后运行生成我的图表外观的javascript代码。
<?php
add_action('wp_enqueue_scripts','enqueue_parent_styles');
function enqueue_parent_styles(){
wp_enqueue_style('parent-style', get_template_directory_uri().'/style.css');
}
function lineChartCustom_Generate($date1,$date2){
//Database queries
global $wpdb;
$overallenergyResults = $wpdb->get_results
(
"SELECT QUERY GOES HERE"
);
// Line chart code
echo "
<div class='lineChartAll'>
<canvas id='myChart' width='400' height='200'></canvas>
<script>
//Chart javascript code goes here using $overallenergyResults variable
</script></div>";
}
?>
答案 0 :(得分:2)
这是一个简单且有效的ajax程序,请对其进行检查以了解其过程,然后以所需的方式对其进行自定义。
该程序从带有id="my-form"
的表单中获取两个日期(date1,date2),并将它们显示为带有id="display"
的div。
page-template.php :
<?php
echo "<script> const ajaxurl = '". admin_url('admin-ajax.php') ."' </script>"; // stores the ajaxurl into a js constant to be accissable in front-end page
?>
<form id='my-form'>
Select Dates: <br>
Date1: <input type='date' name='date1'><br>
Date2: <input type='date' name='date2'><br>
<button id='submit'> submit </button>
</form>
<div id='display' style="border: 1px solid; width: 200px; height: 100px;">
<em>submit the form to see dates here: </em>
</div>
<script type="text/javascript">
jQuery('#submit').on('click', function(event) {
event.preventDefault();
let date1 = jQuery('input[name="date1"]').val();
let date2 = jQuery('input[name="date2"]').val();
let formData = [date1, date2]; // prepare the form data as an array
jQuery.ajax({
url: ajaxurl, // ajaxurl defined at the top of the codes
type: 'POST',
data: {
action: 'your_custom_action', // use this action to handle the event
dataForPHP: formData // this is your form's data that is going to be submitted to PHP function by the name of dataForPHP
},
success: function(response) {
// show the response into dispaly div
jQuery('#display').html(response);
},
error: function(error) {
// show an oops! message
alert('oops! request failed.');
}
});
});
</script>
functions.php :
// ajax actions in wordpress must be handled by two actions: one with the prefex 'wp_ajax_' and another with the prefix 'wp_ajax_nopriv_'
add_action('wp_ajax_your_custom_action', 'your_custom_function');
add_action('wp_ajax_nopriv_your_custom_action', 'your_custom_function');
function your_custom_function() {
if ( isset( $_POST['dataForPHP'] ) ) {
// do anything you want with the submitted data, ex: running database query
$date1 = $_POST['dataForPHP'][0];
$date2 = $_POST['dataForPHP'][1];
}
echo "date 1: $date1 <br> date 2: $date2"; // send the response back to the client.
die();
}
注意:该功能必须对Ajax有响应。响应可以是JSON对象或任何字符串,如果您想返回HTML排版,只需将它们作为字符串回显即可。
有关WP AJAX的更多信息,请点击此处:https://codex.wordpress.org/AJAX_in_Plugins
答案 1 :(得分:0)
是的,Ajax是解决此问题的方法,这是使用Ajax的代码版本:
表格:
<?php
lineChartAll_Generate();
echo "<form id="my-form">
Select Date Range:
<input type='date' name='date1'>
<input type='date' name='date2'>
<button id='submit'> submit </button>
</form>";
?>
JavaScript / jQuery:
通过单击提交按钮,jQuery会将表单数据收集到一个数组中,并将其存储在formData
变量中,然后将其提交给名称为dataForPHP
的PHP,并触发该名称的ajax操作钩子的your_custom_action
jQuery('#submit').on('click', function() {
let formData = jQuery('#my-form').serializeArray(); // retrieves the form's data as an array
jQuery.ajax({
url: ajaxurl, // default ajax url of wordpress
type: 'POST',
data: {
action: 'your_custom_action', // use this action to handle the event
dataForPHP: formData // this is your form's data that is going to be submitted to PHP by the name of dataForPHP
},
success: function( response ) {
// do what you want with the response echoed from PHP
},
error: function( error ) {
// show an oops! message
}
});
});
});
PHP:
PHP使用jQuery触发的ajax操作来运行函数,因此add_action('wp_ajax_your_custom_action', 'your_custom_function');
意味着触发your_custom_action
时,运行your_custom_function
。
add_action('wp_ajax_your_custom_action', 'your_custom_function'); // ajax actions in wordpress must have the prefex 'wp_ajax_'
function your_custom_function() {
if ( isset( $_POST['dataForPHP'] ) ) {
// do staffs with submitted data from the html form...
}
echo 'what you want to receive as a response in jQuery.ajax() success function'; // ignore this line if you don't want to receive any response.
}