我正在尝试从php向ajax发送“通知”或错误消息。我正在努力实现这样的目标:
PHP:
if (myString == '') {
// Send "stringIsEmpty" error to ajax
} else if (myString == 'foo') {
// Send "stringEqualsFoo" error to ajax
}
AJAX
$.ajax({
url: $(this).attr("action"),
context: document.body,
data: formData,
type: "POST",
contentType: false,
processData: false,
success: function(){
alert("It works");
},
error: function() {
if(stringIsEmpty) {
alert("String is empty");
} else if(stringEqualsFoo) {
alert("String equals Foo");
}
}
});
如何向ajax发送错误消息?
更新
这是我的php文件。我尝试使用echo
解决方案的答案,但是当我输出data
的内容(在ajax中)时,我得到undefined
:
<?php
$img=$_FILES['img'];
if($img['name']==''){
echo('noImage');
}else{
$filename = $img['tmp_name'];
$client_id="myId";
$handle = fopen($filename, "r");
$data = fread($handle, filesize($filename));
$pvars = array('image' => base64_encode($data));
$timeout = 30;
$curl = curl_init();
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_URL, 'https://api.imgur.com/3/image.json');
curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
curl_setopt($curl, CURLOPT_HTTPHEADER, array('Authorization: Client-ID ' . $client_id));
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $pvars);
$out = curl_exec($curl);
curl_close ($curl);
$pms = json_decode($out,true);
$url=$pms['data']['link'];
if($url!=""){
echo "<h2>Uploaded Without Any Problem</h2>";
echo "<img src='$url'/>";
}else{
echo "<h2>There's a Problem</h2>";
echo $pms['data']['error'];
header("HTTP/1.1 404 Not Found");
}
}
?>
我在echo("noImage")
if($img['name']==''){
答案 0 :(得分:5)
只有在请求失败时才会调用错误函数,请参阅http://api.jquery.com/jQuery.ajax/
因此,如果您从PHP服务器返回响应,则不会触发错误功能。但是,您可以根据从PHP发送的响应来定义一个处理错误的函数:
success: function(data){
if (data === "stringIsEmpty") {
triggerError("stringIsEmpty");
} else if (data === "stringEqualsFoo") {
triggerError("stringEqualsFoo");
}
},
然后你就可以得到这样的错误函数:
function triggerError(error) {
if (error === "stringIsEmpty") {
alert("Your string is empty!");
} else if (error === "stringEqualsFoo") {
alert("Your string is equal to Foo!");
}
}
如果您提出让post.php说出来的请求,您只需返回一个字符串:
// Create a function to see if the string is empty
$funcOutput = isStringEmpty();
echo $funcOutput;
或者特别针对这个例子:
echo "stringIsEmpty";
有关详细信息,请参阅:How to return data from PHP to a jQuery ajax call
答案 1 :(得分:3)
您可以通过更改php中的http响应代码来触发jQuery错误处理程序。任何4xx或5xx错误都应该有效,但最好留在rfc。
<强> PHP 强>:
// no output before the header()-call
header($_SERVER['SERVER_PROTOCOL'] . ' 500 Internal Server Error');
echo "foo";
<强>的jQuery 强>:
[...]
error: function(jqxhr) {
alert(jqxhr.responseText)
}
[...]
答案 2 :(得分:1)
问题是,如果你的php响应,那么它在技术上不是错误,必须在成功回调中处理。
Timespan
在你的PHP中:
$.ajax({
url: $(this).attr("action"),
context: document.body,
data: formData,
type: "POST",
contentType: false,
processData: false,
success: function(data){
alert('The response is: '+data);
if(data=="empty sting"){
alert("The string is empty");
} else if (data == 'foo') {
alert("The string equals 'foo'");
} else {
alert("It works");
}
},
});
答案 3 :(得分:0)
&#34;错误&#34;当调用在发送过程中失败时,将触发ajax方法的设置。错误如&#34;超时&#34;,&#34; 404&#34;等...
如果您想控制服务器的某些响应,您可以在&#34; success&#34;设置。
$.ajax({
url: $(this).attr("action"),
context: document.body,
data: formData,
type: "POST",
contentType: false,
processData: false,
success: function(response){
if (response == '') {
// Send "stringIsEmpty" error to ajax
} else if (response== 'foo') {
// Send "stringEqualsFoo" error to ajax
}
}
}
});
PHP可能是这样的
if (myString == '') {
echo '';
} else if (myString == 'foo') {
echo 'foo';
}
答案 4 :(得分:0)
我已经尝试过使用带有错误处理功能的jQuery AJAX和PHP引导程序模型
JavaScript文件:
// add receipt data
$('#insert_form').on("submit", function(event) {
event.preventDefault();
$.ajax({
url: "includes/user-insert.inc.php",
method: "POST",
data: $('#insert_form').serialize(),
async: true,
beforeSend: function() {
$('#insert').val("Inserting");
},
success: function(data) {
$('#insert_form')[0].reset();
$('#add_reciept').modal('hide');
dataTable.ajax.reload(null, false);
if (data == "No") {
$('#alert-danger').addClass('alert alert-danger');
$('#alert-danger').html('<strong>Oh snap!</strong> Sorry, that Record wasn\'t Added <b>Try Again</b>');
$('#alert-danger').fadeIn().show();
setTimeout(function() {
$('#alert-danger').fadeOut("slow");
}, 8000);
} else if (data == "Yes") {
$('#alert-success').html('<strong>Well done!</strong> A Record has been Added.');
$('#alert-success').addClass('alert alert-info');
$('#alert-success').fadeIn().show();
setTimeout(function() {
$('#alert-success').fadeOut("slow");
}, 8000);
}
},
error: function(err) {
$('#alert-danger').addClass('alert alert-danger');
$('#alert-danger').html('<strong>Oh snap!</strong> Sorry, that Record wasn\'t Added <b>Try Again</b>');
$('#alert-danger').fadeIn().show();
setTimeout(function() {
$('#alert-danger').fadeOut("slow");
}, 8000);
},
complete: function(data) {
$('#insert').val("Insert");
}
});
});
process.inc.php文件:
// check users again or not
$sql = "SELECT * FROM users_acc WHERE U_Email='$U_Email'";
$result = mysqli_query($conn, $sql);
$resultCheck = mysqli_num_rows($result);
if ($resultCheck > 0) {
echo 'No';
} else {
$query = "
INSERT INTO users_acc(Firstname, Lastname, U_Email, U_Password, Gender, user_role_id)
VALUES('$Firstname', '$Lastname', '$U_Email', '$U_Password', '$Gender' , '$user_role_id')
";
echo 'Yes';
}
答案 5 :(得分:-1)
因此,如果返回的字符串为空,或者它等于“foo”,您可能认为这是一个错误,但HTTP认为它是成功的,您需要在“成功”函数中查找这些字符串。 / p>