这个jquery应用程序如何验证用户名? (第三方脚本) [英] how is this jquery app validating the username? (3rd party script)

问题描述

我要弄清楚的教程是这样的:
http://www .position-absolute.com/articles/jquery-form-validator-因为表单验证-is-a-mess/

The tutorial that I'm trying to figure out is this:
http://www.position-absolute.com/articles/jquery-form-validator-because-form-validation-is-a-mess/

username字段如下所示:

<input value="" class="validate[required,custom[noSpecialCaracters],length[0,20],ajax[ajaxUser]]" type="text" name="user" id="user" />

该<input>字段具有一个名为ajax[ajaxUser]的类项目，该类项目的规则包含在此脚本(jquery.validationEngine-en.js)中.

That <input> field has a class item named ajax[ajaxUser] which has its rules contained in this script (jquery.validationEngine-en.js).

该项目的代码段如下所示:

The snippet for that item looks like this:

"ajaxUser":{
    "file":"validateUser.php",
    "extraData":"name=eric",
    "alertTextOk":"* This user is available",   
    "alertTextLoad":"* Loading, please wait",
    "alertText":"* This user is already taken"},

我根本无法弄清的是validateUser.php的PHP页面是如何工作的.这些帖子字段都来自哪里?我环顾四周，找不到具有这些名称的字段.

What I can't figure out at all is how its PHP page is working which is validateUser.php. Where are all those post fields coming from? I looked around and can't find a field with those names.

谢谢

推荐答案

发布数据如下:

validateValue=karnius&validateId=user&validateError=ajaxUser

似乎validateId是表单元素名称，而validateError来自ajax[ajaxUser].

It appears that validateId is the form element name and validateError comes from ajax[ajaxUser].

响应如下:

{"jsonValidateReturn":["user","ajaxUser","true"]}

PHP代码可能如下所示:

The PHP code could look something like this:

<?php
    $result = mysql_query('SELECT 1 FROM users WHERE username = "'.mysql_real_escape_string($_POST['validateValue']).'"');
    $response = $result ? 'false' : 'true';
    echo json_encode(array('jsonValidateReturn' => array(
        $_POST['validateId'],
        $_POST['validateError'],
        $response)));
?>

(显然，更复杂的处理程序可以将其行为基于validateId和validateError.)

(Obviously, a more complicated handler could base its behavior on validateId and validateError.)

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