ajax如何从PHP文件返回错误消息 [英] ajax how to return an error message from a PHP file

问题描述

当我将鼠标悬停在任何单词上时，总是显示一个黑框.如果PHP代码返回文本，它将显示在黑框中(应该显示).但是，如果文本未返回，我希望它返回一个错误函数，以便以后可以更改黑框的CSS，以使其宽度为0px而不是400px.

At the moment when I hover over any word a black box is always showing. If the PHP code returns text it is displayed in the black box (which it should). However I want it to return an error function if the text is not returned so I can then later change the CSS for the black box so that it has a width of 0px instead of 400px.

var x = ($(this).text());
$.ajax({
    type: 'POST',
    url: 'process.php',
    data: { text1: x },
    success: function(response){
        $('#tooltip').text(response);
    }
});

try 
{
    $db = new PDO('sqlite:ordbas.db');
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);  
} catch(PDOException $err)
{
    echo "PDO fel $err";
}

if (isset($_POST['text1'])) {
    $text1 = $_POST['text1'];
    $results = $db->prepare("SELECT forord FROM words WHERE sokord='$text1'");
    $results->execute();
    $row = $results->fetch();
    echo $row[0];
}       

您可能已经发现，我遗漏了一些不重要的代码.希望有人能理解和帮助我！谢谢！

As you might have figured out there is some non-important code that I left out. I hope someone can understand and help me! Thanks!

推荐答案

以下正是您的操作方法:

Here is exactly how you can do it :

在您的PHP文件中:

if ($query) {
    echo "success"; //anything on success
} else {
    die(header("HTTP/1.0 404 Not Found")); //Throw an error on failure
}

在您的jQuery AJAX端:

var x = $(this).text();
$.ajax({
    type: 'POST',
    url: 'process.php',
    data: { text1: x },
    success:function(data) {
        alert(data); //=== Show Success Message==
    },
    error:function(data){
        alert("error occured"); //===Show Error Message====
    }
});

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