Laravel 通过 jquery submit() 提交表单后的文件验证；

Question

当我尝试通过 jquery 提交表单后验证图像文件时

$('#logo').submit();

我总是收到验证错误

The img field is required

这是我用来验证文件的验证

$input = array('img' => Input::file('img'));
$rules = array(
        'img' => 'required',
);
// Now pass the input and rules into the validator
$validator = Validator::make($input, $rules);

// check if the validator failed -----------------------
if ($validator->fails()) {
    // get the error messages from the validator
    $messages = $validator->messages();
    // redirect our user back to the form with the errors from the validator
    print_r($messages);
}

我没能确定脚本有什么问题，帮助我克服这个问题。提前致谢。

Answer 1

如果您提交的表单包含 <input type="file"> 和 ajax/jquery，这几乎是不可能的，除非您使用类似 Jquery file upload 或 dropzone.js, 等。但是您仍然可以使用 XMLHttpRequest 自行完成此操作。下面的例子：

var forms = document.querySelector('form#yourFormId');

   var request = new XMLHttpRequest();

   var formDatas = new FormData(forms);
   request.open('post','upload');
   //Here "upload" is your post route
   request.send(formDatas);

   request.onreadystatechange = function() {
    if (request.readyState === 4) {
      if (request.status === 200) {
       //The request was successful

     }else{

    //Request wasn't OK
}

那么你应该可以在控制器中调用你输入的文件名：

Input::get('inputFileName')

Answer 2

要将 jQuery + ajax 的文件提交到 Laravel，我遵循以下方法：

示例表格：

<form class="form-horizontal" role="form" method="POST" id="imageUpload" action="some/backend/method" enctype="multipart/form-data">
    <div class="form-group">
        <div class="alert alert-danger" style="display: none;"></div>
        <label class="col-sm-3 control-label no-padding-right"> <i class="fa fa-asterisk light-red"></i> Image</label>
        <div class="col-sm-9">
            <input type="file" name="image" class="form-control" required/>
        </div>
    </div>
</form>

Note: set an ID to the form.

示例ajax请求：

$.ajax({
    type: 'POST',
    data: new FormData($("#imageUpload")[0]),
    url: 'some/backend/method',
    processData: false,
    contentType: false
}).done(function (result) {
    if ($.isEmptyObject(result.error)) {
        window.location.reload();
    } else {
        var messages = '';
        for (var key in result.error) {
            if (result.error.hasOwnProperty(key)) {
                messages += result.error[key] + '<br />';
            }
        }
        $("#imageUpload .alert").html(messages).css('display', 'block');
    }
}, "json");

Note: processData: false & contentType: false are quite important.

在后端 (Laravel):

$validator = Validator::make(Input::all(), [
    'image' =>'required'
]);

if ($validator->fails()) {
    return Response::json(['error' => $validator->messages()]);
} else {
    return Response::json(['success' => true]);
}

Laravel 通过 jquery submit() 提交表单后的文件验证；

Laravel file validation after submitting form via jquery submit();

jquery

file-upload

laravel

laravel-4

laravel-validation