PHP-停止在“提交”按钮上提交空白表格
[英]PHP - Stop empty form submission on submit button
问题描述
I have an html page(edituserdetails.html), where I have a form containing 3 textboxes: FirstName, LastName,Email and a submit button. 
我有一个html页面（edituserdetails.html），其中有一个包含3个文本框的表单：名字，姓氏，电子邮件和提交按钮。 On clicking submit button, I'm validating these 3 textboxes(inside a function " SaveEdit "). 单击提交按钮后，我正在验证这3个文本框（在“ SaveEdit ”函数中）。 Below is my code: 下面是我的代码：
if ($_POST['SaveUserDetails']) {
$Id = $args[2];
if(empty($_POST['FirstName']))
{
$this->smarty->assign('FirstNameEmpty',"Please enter your firstname!");
controller::display($this, 'tpl.edituserdetails.html');
}
if(empty($_POST['LastName']))
{
$this->smarty->assign('LastNameEmpty',"Please enter your lastname!");
controller::display($this, 'tpl.edituserdetails.html');
}
if(empty($_POST['Email']))
{
$this->smarty->assign('EmailEmpty',"Email field should not be empty!");
controller::display($this, 'tpl.edituserdetails.html');
}`
Now, the problem is that the same function loads the textboxes with contents from the database(This code is also inside SaveEdit ): 现在，问题是该函数从数据库中加载带有内容的文本框（此代码也位于SaveEdit内 ）：
$x = $args[2];
$x = mysql_real_escape_string($x);
$result = db::sql("Select contact_fname,contact_lname,contact_email from billing_buyer where id = '$x'");
$row = mysql_fetch_assoc($result);
$this->smarty->assign('FirstName', $row['contact_fname']);
$this->smarty->assign('LastName', $row['contact_lname']);
$this->smarty->assign('Email', $row['contact_email']);
Due to this, when I click 'Submit' button even with empty textboxes, page refreshes and fills textboxes from database. 因此，即使在文本框为空的情况下，单击“提交”按钮，页面也会刷新并填充数据库中的文本框。 As a result, my validations aren't working properly. 结果，我的验证无法正常工作。 Please help. 请帮忙。 Below is my html(I have used Smarty variable $FirstName,$LastName and $Email for dislaying the respective data. $FirstNameEmpty, $LastNameEmpty etc. are the smarty variables containing error messages for validation. 下面是我的html（我使用了Smarty变量$ FirstName，$ LastName和$ Email来放置各自的数据。$ FirstNameEmpty，$ LastNameEmpty等是包含用于验证错误消息的smarty变量。
<html>
<div>
<form action="" method="post" id="subscriptions" onsubmit="">
<input type="hidden" value="form" name="action">
<div class="form">
<h2><span>Edit User Details</span></h2>
<div>
<table id="im_list" class="primary_table" border="0" cellpadding="10px" cellspacing=0>
<tr>
<td>First Name</td>
<td class="bar_style"> <input type="text" name="FirstName" value="{$FirstName}"></td>
<td><font color="red">{$FirstNameEmpty}</font></td>
</tr>
<tr>
<td>Last Name</td>
<td class="bar_style"> <input type="text" name="LastName" value="{$LastName}"></td>
<td><font color="red">{$LastNameEmpty}</font></td>
</tr>
<tr>
<td>Contact email</td>
<td class="bar_style"><input type="text" name="Email" value="{$Email}"></td>
<td><font color="red">{$EmailEmpty}</font></td>
<td><font color="red">{$WrongEmailFormat}</font></td>
</tr>
<tr>
<td>
<input id="SaveUserDetails" name="SaveUserDetails" type="submit" value="Save Preferences">
</td>
</tr>
</table>
</div>
</div>
</form>
</div>
2 个解决方案
解决方案1
2 2015-04-28 13:05:31
If I understand correctly you have problem with fills. 如果我理解正确，您可能会遇到填充问题。 Try to do your select from DB only if form i success submited. 仅当成功提交表单后，才尝试从数据库中进行选择。 By the way, do update before select. 顺便说一句，请在选择之前进行更新。
success submited = all if clauses are passed. 成功提交=所有if子句均已通过。
Example: 例：
if(!empty($_POST['FirstName']) && !empty($_POST['LastName']) && !empty($_POST['Email']) ){
// update
// And select
$x = $args[2];
$x = mysql_real_escape_string($x);
$result = db::sql("Select contact_fname,contact_lname,contact_email from billing_buyer where id = '$x'");
$row = mysql_fetch_assoc($result);
$this->smarty->assign('FirstName', $row['contact_fname']);
$this->smarty->assign('LastName', $row['contact_lname']);
$this->smarty->assign('Email', $row['contact_email']);
}
解决方案2
1 已采纳 2015-04-28 13:03:16
Check my below method. 检查我下面的方法。 Initialize a flag with false, Inside each failed validation make it true. 用false初始化一个标志，在每个失败的验证中将其设置为true。
Before your select query add a condition to only if there is no validation error. 在选择查询之前，仅在没有验证错误时才添加条件。
<?php
function yourFunctionName(){
if ($_POST['SaveUserDetails']) {
$Id = $args[2];
$error = false;
if(empty($_POST['FirstName']))
{
$this->smarty->assign('FirstNameEmpty',"Please enter your firstname!");
controller::display($this, 'tpl.edituserdetails.html');
$error = true;
}
if(empty($_POST['LastName']))
{
$this->smarty->assign('LastNameEmpty',"Please enter your lastname!");
controller::display($this, 'tpl.edituserdetails.html');
$error = true;
}
if(empty($_POST['Email']))
{
$this->smarty->assign('EmailEmpty',"Email field should not be empty!");
controller::display($this, 'tpl.edituserdetails.html');
$error = true;
}
if(!$error){
$x = $args[2];
$x = mysql_real_escape_string($x);
$result = db::sql("Select contact_fname,contact_lname,contact_email from billing_buyer where id = '$x'");
$row = mysql_fetch_assoc($result);
$this->smarty->assign('FirstName', $row['contact_fname']);
$this->smarty->assign('LastName', $row['contact_lname']);
$this->smarty->assign('Email', $row['contact_email']);
}
}
}
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