Question

我使用以下代码添加值

$debdes = $_POST['debdes'];
$debamt = $_POST['debamt'];
$crdes  = $_POST['crdes'];
$cramt  = $_POST['cramt'];
$date   = $_POST['date'];
include_once ("db.php");

$ucbook = "INSERT INTO cbook(debdes,debamt,crdes,cramt,date) VALUES ('$debdes','$debamt','$crdes','$cramt','$date');";

现在我希望如果“debamt”被填充“debdes”不应该是空的，如果“cramt”被填充，那么“crdes”不应该是空的，同时按下提交按钮，所以如果有人按下提交按钮它显示一条消息说首先填写“debdes”。

Answer 1

您正在寻找的是一些基本的表单验证：

$debdes = $_POST['debdes'];
$debamt = $_POST['debamt'];
$crdes  = $_POST['crdes'];
$cramt  = $_POST['cramt'];
$date   = $_POST['date'];
include_once ("db.php");

$errors = array();

// Check for error conditions
if(!empty($debamt) && empty($debdes)) {
    $errors[] = 'Fill also debdes';
}

if(!empty($cramt) && empty($crdes)) {
    $errors[] = 'Fill also crdes';
}

// If no errors were found, execute the query
if(count($errors) == 0) {
    $ucbook = "INSERT INTO cbook(debdes,debamt,crdes,cramt,date) VALUES     ('$debdes','$debamt','$crdes','$cramt','$date');";
} else {
    // If there are errors, display them:
    echo implode('<br />', $errors);
}

Answer 2

在上一个表单本身上，您可以使用“提交”按钮触发javascript函数，如下所示： -

function validate(){
    var debamt=document.*form_name*.debamt.value;
    var debdes=document.*form_name*.debdes.value;
    var error_message;
    if(debamt!=null && debdes==null){      
        error_message = 'Please fill debdes value first!!!';
    }
    var cramt=document.*form_name*.cramt.value;
    var crdes=document.*form_name*.crdes.value;
    if(cramt!=null && crdes==null){      
        error_message = '\nPlease fill crdes value first!!!';
    }
    alert(error_message);
}

Answer 3

 if( ! empty($_POST['debdes']) && empty($_POST['debdes']))
     die('fill "debdes" first');

对于cramt和crdes来说同样如此。

Answer 4

$debdes = $_POST['debdes'];
$debamt = $_POST['debamt'];
$crdes  = $_POST['crdes'];
$cramt  = $_POST['cramt'];
$date   = $_POST['date'];

if ( !empty($debamt) && empty($debdes) ) {
    show_error('debdes');
}

if ( !empty($cramt) && empty($crdes) ) {
    show_error('drdes');
}

function show_error($string) {
    echo "Value '$string' must be filled.";
    exit;
}

include_once ("db.php");

$ucbook = "INSERT INTO cbook(debdes,debamt,crdes,cramt,date)
           VALUES ('$debdes','$debamt','$crdes','$cramt','$date');";

php停止将空值传递给mysql

4 个答案: