如何通过AJAX和JSON将数组从PHP转换为JAVASCRIPT？

有人可以帮我吗？ 好像我得到一个字符串而不是一个数组。 一旦我传递数组，这是一个SQL查询的结果，从PHP到Javascript通过AJAX，我想循环数组并填充表单中的一些字段。 我发布了代码：

JAVASCRIPT

(function($){ $(document).ready(function() { $('#input_12_153').change(function (){ if ($('#input_12_153').attr("value")== 'no-selection'){ $('#input_12_48').val( '' );} else{ var valor = $('#input_12_153').attr("value"); jQuery.ajax({ // We use jQuery instead $ sign, because WordPress convention. url : '/optcat/wp-admin/admin-ajax.php', // This addres will redirect the query to the functions.php file, where we coded the function that we need. type : 'POST', data : { action : 'my_action', fieldvalue : valor, }, success: function(data) { alert( data ); //Here I would like to loop the array and get the values } }); } }); }); })(jQuery); 

PHP（Functions.php）

 add_action( 'wp_ajax_my_action', 'my_action' ); add_action( 'wp_ajax_nopriv_my_action', 'my_action' ); // This lines it's because we are using AJAX on the FrontEnd. function my_action(){ global $wpdb; $tablename = $wpdb->prefix . 'rg_lead_detail'; $lead_id = $_POST['fieldvalue']; // This variable will get the POST 'fieldvalue' $form_id = 21; $sql = "SELECT value FROM $tablename WHERE lead_id = %d AND form_id= %d"; $results = $wpdb->get_results( $wpdb->prepare( $sql, $lead_id, $form_id ), ARRAY_A ); echo json_encode($results,JSON_FORCE_OBJECT); } 

Answer 1

使用JSON.parse（）将PHP中的字符串转换为数组。

 success: function(data) { var results = JSON.parse(data); // like this alert( data ); //Here I would like to loop the array and get the values } 

Answer 2

在我的情况下，没有必要使用JSON.parse(data); 否则我曾经得到“在位置1的JSON中出现意外令牌o”的错误。通过仅放置dataType: "json"就足够了。 我发布了我的最终代码：

的functions.php

 add_action( 'wp_ajax_my_action', 'my_action' ); add_action( 'wp_ajax_nopriv_my_action', 'my_action' ); // This lines it's because we are using AJAX on the FrontEnd. function my_action(){ global $wpdb; $tablename = $wpdb->prefix . 'rg_lead_detail'; $lead_id = $_POST['fieldvalue']; // This variable will get the POST 'fieldvalue' $form_id = 21; $sql = "SELECT value FROM $tablename WHERE lead_id = %d AND form_id= %d"; $results = $wpdb->get_results( $wpdb->prepare( $sql, $lead_id, $form_id ), ARRAY_A ); echo json_encode($results); die(); } 

使用Javascript

 (function($){ $(document).ready(function() { $('#input_12_153').change(function (){ if ($('#input_12_153').attr("value")== 'no-selection'){ $('#input_12_48').val( '' );} else{ var valor = $('#input_12_153').attr("value"); jQuery.ajax({ // We use jQuery instead $ sign, because WordPress convention. url : '/optcat/wp-admin/admin-ajax.php', // This addres will redirect the query to the functions.php file, where we coded the function that we need. type : 'POST', data : { action : 'my_action', fieldvalue : valor, }, dataType:'json', success: function(data) { //var results = JSON.parse(data); // like this $(data).each(function(i,val){ $.each(val,function(k,v){ alert(k+" : "+ v); }); }); } }); } }); }); })(jQuery);