Yii CActiveForm

http://blog.sina.com.cn/s/blog_685213e70101mo4i.html

文档：

http://www.yiiframework.com/doc/api/1.1/CActiveForm

All these validations share the same set of validation rules declared in the associated model class. CActiveForm is designed in such a way that all these validations will lead to the same user interface changes and error message content. 

To ensure data validity, server-side validation is always performed. By setting enableAjaxValidation to true, one can enable AJAX-based validation; and by setting enableClientValidation to true, one can enable client-side validation. Note that in order to make the latter two validations work, the user's browser must has its JavaScript enabled. If not, only the server-side validation will be performed. 

The AJAX-based validation and client-side validation may be used together or separately. For example, in a user registration form, one may use AJAX-based validation to check if the user has picked a unique username, and use client-side validation to ensure all required fields are entered with data. Because the AJAX-based validation may bring extra workload on the server, if possible, one should mainly use client-side validation. 

The AJAX-based validation has a few limitations. First, it does not work with file upload fields. Second, it should not be used to perform validations that may cause server-side state changes. Third, it is not designed to work with tabular data input for the moment. 

Login.php:

------------------------------------------------------------------------

<?php $form=$this->beginWidget('CActiveForm', array(

'id'=>'login-form',

'enableClientValidation'=>true, //进行客户端验证

'clientOptions'=>array(

//点击submit按钮时进行验证

'validateOnSubmit'=>true,

),

'htmlOptions'=>array(

//设置是否进行表单数据的验证

'onsubmit'=>'return aa()',  //当点击submit按钮时进行验证,若aa函数返回true，则表单提交，若返回false，则不提交

),

)); ?>

 

js:

----------------------------------------------------------------------------

function aa(){

alert('ss');

return false;//返回false则不进行表单的提交

}

 

 

 

http://my.oschina.net/lonxom/blog/168247

 

http://www.php100.com/manual/yii/CCaptchaAction.html 类参考：

yii刷新页面验证码不变修改

原因：
每次刷新页面的时候都会调用CCaptcha这个widget的run方法来运行这个助手：
/**

 * Renders the widget.

 */

public function run()

{

    if(self::checkRequirements())

    {

        $this->renderImage();   //生成验证码图片

        $this->registerClientScript();

    }

    else

        throw new CException(Yii::t('yii','GD and FreeType PHP extensions are required.'));

}

/**

 * Renders the CAPTCHA image.

 */

protected function renderImage()

{

    if(!isset($this->imageOptions['id']))

        $this->imageOptions['id']=$this->getId();

 

   //生成验证码图片链接src地址，这个是生成图片的关键，指向action为 $captchaAction='captcha'的方法，即调
用CCaptchaAction这个方法来生成验证码图片

    $url=$this->getController()->createUrl($this->captchaAction,array('v'=>uniqid()));

    $alt=isset($this->imageOptions['alt'])?$this->imageOptions['alt']:'';

    echo CHtml::image($url,$alt,$this->imageOptions);

} 

 

CCaptchaAction中的执行流程：

/**

 * Runs the action.

 */

public function run()

{

    if(isset($_GET[self::REFRESH_GET_VAR]))  // AJAX request for regenerating code

    {

        $code=$this->getVerifyCode(true);

        echo CJSON::encode(array(

            'hash1'=>$this->generateValidationHash($code),

            'hash2'=>$this->generateValidationHash(strtolower($code)),

            // we add a random 'v' parameter so that FireFox can refresh the image

            // when src attribute of image tag is changed

            'url'=>$this->getController()->createUrl($this->getId(),array('v' => uniqid())),

        ));

    }

    else

        $this->renderImage($this->getVerifyCode());  //刷新页面时会调用这个，问题就出现在这，他调用
这个方法的时候没有传递参数true

    Yii::app()->end();

} 

/**

 * Gets the verification code.

 * @param boolean $regenerate whether the verification code should be regenerated.

 * @return string the verification code.

 */

public function getVerifyCode($regenerate=false) //从这个参数可以看出 如果$regenerate为true，则会
重新生成验证码图片

{

    if($this->fixedVerifyCode !== null) 

        return $this->fixedVerifyCode;

    $session = Yii::app()->session;

    $session->open();

    $name = $this->getSessionKey();

    if($session[$name] === null || $regenerate)

    {

        $session[$name] = $this->generateVerifyCode();

        $session[$name . 'count'] = 1;

    }

    return $session[$name];

} 


解决办法：

一：根据getVerifyCode这个方法中的这段代码来修改，这段代码是用于验证的，如果设定了fixedVerifyCode，则每次
生成时都会生成一个固定的验证码，我们所要做的是把这个固定的变成动态的。  
 
if($this->fixedVerifyCode !== null) 
        return $this->fixedVerifyCode;

修改控制器中生成验证码的配置：
/**
 * Declares class-based actions.
 */
public function actions()
{
    return array(
        // captcha action renders the CAPTCHA image displayed on the register page
        'captcha'=>array(
            'class'=>'CCaptchaAction',
            'fixedVerifyCode' => substr(md5(time()),0,4), 
            'foreColor' => 0x55FF00,
            'testLimit' => 0,  //不限制相同验证码出现的次数
            'offset' => 5,
            'minLength' => 4,
            'maxLength' => 4,
            'transparent' => true,
        ),
    );
} 


二、继承CCaptchaAction这个类，修改 run()方法中的 $this->renderImage($this->getVerifyCode())这句为
$this->renderImage($this->getVerifyCode(true))，其他不变

缺点：这种方法在CActiveForm开启enableClientValidation=true时，总是报验证码不正确，
enableAjaxValidation开启没事，待解决。。。

代码如下：
继承的类DCCaptchaAction.php

对应修改生成验证码的controller如下：

 

 

yii验证码问题总结：

http://blog.csdn.net/poly_sunny/article/details/19995801

 

Yii验证码总是不正确原因  

http://blog.163.com/wangzhenbo85@126/blog/static/1013632822013230315743/?suggestedreading&wumii