当出现错误时，如何将用户重新填写的表单字段重新填写到表单中? [英] How can I re-fill form fields that a user filled out after I've redirected them back to the form when there was an error?

问题描述

简短版本:

• 我有一个包含100多个字段的表单，每个字段都有服务器端验证.
• 我的表格正在工作并且数据已成功提交；验证发生错误时，我什至将它们重定向回表单，并显示具体发生了什么错误.
• 将他们重定向回(大量)表格后，所有数据都消失了，需要再次输入.

我已经想到了几种回答我自己的问题的方法，但是它们并不是目前为止最优雅的解决方案.

I have already thought of a couple ways of answering my own question, but they aren't the most elegant solutions out there.

我当前的思维过程是:将所有输入的数据保存为$ _SESSION变量-每当他们加载表单时，就这样对每个输入执行 if 语句；

My current thought process is: save all of their inputted data as $_SESSION variables -- and whenever they load the form, do an if statement around each input, as such;

if(isset($_SESSION['foo_data'])) {

    echo "<input type='text' name='foo' value='$_SESSION["foo_data"]'>";

} else {

    echo "<input type='text' name='foo' placeholder='Enter your text here...'>";

}

此方法将有效，但是它还涉及到对140多个会话变量的繁琐定义，然后围绕 EVERY 的if/else语句进行了更为繁琐和巨大的创建>表单字段.

This method will work, but it also involves an immensely tedious definition of 140+ session variables, followed by an even more tedious and immense creating if/else statements around EVERY form field.

还有更好的方法吗?

其他信息:使用纯PHP，没有任何框架.

Additional info: using plain php, no frameworks of any kind.

推荐答案

不需要会话.您的基本计划应该是:

Sessions are unnecessary. Your basic plan should be:

• 从$ _POST()获取变量
• 验证表单值.
• 使用通过验证的值创建一个数组.
• 重定向到表单时，使用数组填充值.

在我开始使用CodeIgniter之前，我曾经使用 if 语句来验证并生成如下错误消息:

Before I started using CodeIgniter, I used to use if statements to validate and generate error messages like this:

if ( ! empty($_POST['email'])){
    if ($this->verifyInput($_POST['email'], 6)){
        $fill['email'] = $_POST['email'];//$fill is the array of values that passed validation
    } else $tally++;//$tally keeps a running count of the total number of erors
}

我对 $ this-> verifyInput 进行函数调用，该函数接受字段值和要执行的验证类型-在这种情况下为6，表示电子邮件.这是我的验证功能:

I make a function call to $this->verifyInput which accepts the field value and the type of validation to perform--in this case it's 6, which indicates email. Here's my validation function:

function verifyInput($input, $type){
    if ($type == 0)     $pattern =  '/^1$/';//just the number 1
    elseif ($type == 1) $pattern =  '/^[0-9]+$/';//just integers
    elseif ($type == 2) $pattern =  '/^[A-Za-zÁ-Úá-úàÀÜü]+$/';//just letters
    elseif ($type == 3) $pattern =  '/^[0-9A-Za-zÁ-Úá-úàÀÜü]+$/';//integers & letters
    elseif ($type == 4) $pattern =  '/^[A-Za-zÁ-Úá-ú0-9àÀÜü\s()\/\'":\*,.;\-!?&#$@]{1,1500}$/';//text
    elseif ($type == 5) $pattern =  '/^[A-Za-zÁ-Úá-úàÀÜü0-9\']+[A-Za-zÁ-Úá-úàÀÜü0-9 \'\-\.]+$/';//name
    elseif ($type == 6) $pattern = '/^.+@[^\.].*\.[a-z]{2,}$/';//e-mail
    elseif ($type == 7) $pattern = '/^((\(0?[1-9][0-9]\))|(0?[1-9][0-9]))?[ -.]?([1-9][0-9]{3})[ -.]?([0-9]{4})$/';//brazilian phone
    if (preg_match($pattern, $input) == 1) return true;
    else return false;
}

验证完成后，我将使用 $ fill 数组为每个字段预填表单:

Once the validation is done, I use the $fill array to prefill the form for each field:

<input class="field" type="text" name="email" value = "<?php echo $fill['email']; ?>"/>

您还应该确保 $ fill 包含空值，例如 $ fill ['email'] =''; 或检查以确保这些值在填充输入标签之前进行设置:

You should also make sure that $fill is iniciated with empty values such as $fill['email']=''; or check to make sure the values are set before filling the input tags:

<input class="field" type="text" name="email" value = "<?php if(isset($fill['email'])) echo $fill['email']; ?>"/>

这些只是可以满足您的需求的一般准则，但是我发现这是处理它的便捷方法.

These are just general guidelines that you can adapt to your needs, but I found this to be a convenient way to handle it.

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