我正在使用远程验证方法，并对 http://jqueryvalidation.org/remote-method/ 的以下部分有疑问.
响应被评估为 JSON，并且对于有效元素必须为 true，对于无效元素可以为任何 false、未定义或 null，使用默认消息；或字符串，例如。错误消息显示为“该名称已被占用，请尝试 peter123”。
如果服务器echo('custom error');，则没有通过验证，但不显示错误。为什么不呢？
如果服务器执行 echo(null); 或 echo(false);，或者根本没有回显，则客户端似乎不会得到响应，它没有通过验证，并且不显示默认消息。它不应该显示默认消息吗？同样，如果服务器执行 echo('undefined');，客户端会收到“undefined”，但不会显示默认消息。
服务器脚本
<?php
header('Content-Type: text/plain;');
//The following passes validation
//echo('true');
//The following results in the client receiving 1, and "1" is displayed as error
//echo(true);
//echo(1);
//echo('1');
//The following will trigger the default message
//echo(0);
//echo('null');
//echo('false');
//echo('0');
//The following results in no ajax response to client, and no message is displayed.
//Doesn't this result in client getting undefined which should display the default message
//echo(null);
//echo(false);
//no echo at all
//Client receives "undefined", but it doesn't display the default message. Shouldn't it?
//echo('undefined');
//Client receives "custom error", but it doesn't display this text. Shouldn't it?
echo('custom error');
?>
客户端脚本
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Testing</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.13.1/jquery.validate.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
var validator=$("#myForm").validate({
rules: {
bla: {
minlength:2,
maxlength:4,
required:true,
remote: {url:"validate.php",type:'get',data:{a:1,b:2,c:3}}
//remote: "validate.php"
}
},
messages: {
bla: {
remote:"default message"
}
}
});
});
</script>
</head>
<body>
<form id="myForm" method="post">
<input name="bla" id="bla" value="">
<input type="submit" value="submit">
</form>
</body>
</html>
最佳答案
"If the server echo('custom error');, it does not pass validation, but the error is not displayed. Why not?"
因为您需要将服务器响应作为 JSON 字符串发送回来；不是常规字符串，也不是 bool 值。
echo json_encode('this is going to be the error message');
这将通过验证...
echo json_encode('true');
这将导致验证失败并使用默认消息...
echo json_encode('false');
这些也将像上面一样工作......
echo 'true' // pass
echo 'false' // fail using default message
这行不通...
echo 'custom message';
//The following results in the client receiving 1, and "1" is displayed as error [snip] ....
文档:
"The response is evaluated as JSON and must be... any false, undefined or null for invalid elements"
任何不被解释为包含“true”的字符串的内容都将无法通过验证。 由于您没有将这些响应作为 JSON 进行回显，因此您的各种错误消息被证明是非常不可预测的。
是的，我同意文档中的 JSON 措辞有点含糊。 “评估为 JSON” 似乎暗示插件正在执行转换。不是这种情况。服务器响应在评估时必须已经是 JSON。
<小时/>type:'get'
GET 已经是 remote 方法的默认值，不需要指定。
我创建了一个pull request将文档更改为:
The serverside response must be a JSON string that must be
"true"for valid elements, and can be"false",undefined, ornullfor invalid elements, using the default error message. If the serverside response is a string, eg."That name is already taken, try peter123 instead", this string will be displayed as a custom error message in place of the default.
关于php - jQuery 验证器远程方法，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29775304/