Detailed explanation of how to implement Ajax to upload user avatars in Laravel projects-Laravel-php.cn

Detailed explanation of how to implement Ajax to upload user avatars in Laravel projects

藏色散人

Release： 2021-02-17 10:14:38

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In the process of writing web programs, we often encounter a classic file upload scenario: upload Avatar (picture). Based on the pursuit of the best user experience, write about the Ajax uploading avatar implemented in the Laravel project before.

1. Configure routing

Set routing in Laravel’s routes.php:

Route::get('/avatar/upload','UsersController@avatar');
Route::post('/avatar/upload','UsersController@avatarUpload');

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2. Configure controller

Add the corresponding avatar and avatarUpload methods in UsersController.php. The former is used to render the view, and the latter processes the actually uploaded image file.

 public function avatar()
    {

        return view('users.avatar');
    }

  public function avatarUpload()
    {
    //some codes to deal with upload avatar
    }

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3. Write the front-end code

This is actually set in the avatar.blade.php view file of the corresponding users/ folder Style, each tag of the following HTML can be set according to your own situation class and id:

<header class="profile-header">
 <img id="user-avatar" src="https://wt-prj.oss.aliyuncs.com/0d06af79c49d4e08abb1ab3f7ab6e860/772c684b-10a4-43cf-8eec-dda9e28a5a23.png">

<p id="validation-errors"></p>

<p class="avatar-upload" id="avatar-upload">
 {!! Form::open( [ 'url' => ['/avatar/upload/api'], 'method' => 'POST', 'id' => 'upload', 'files' => true ] ) !!}
<a href="#" class="btn button-change-profile-picture">
<label for="upload-profile-picture">
<span id="upload-avatar">更换新头像</span>
 <input name="image" id="image" type="file" class="manual-file-chooser js-manual-file-chooser js-avatar-field">
</label>
</a>
{!! Form::close() !!}


<p class="span5">
<p id="output" style="display:none">
</p>
</p>


<span id="filename"></span>
 </header>

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to implement Ajax requests in js, the Ajax here uses Jquery Third-party plug-in http://malsup.com/jquery/form/:

$(document).ready(function() {
            var options = {
                beforeSubmit:  showRequest,
                success:       showResponse,
                dataType: 'json'
            };
            $('#image').on('change', function(){
                $('#upload-avatar').html('正在上传...');
                $('#upload').ajaxForm(options).submit();
            });
        });
    function showRequest() {
        $("#validation-errors").hide().empty();
        $("#output").css('display','none');
        return true;
    }

    function showResponse(response)  {
        if(response.success == false)
        {
            var responseErrors = response.errors;
            $.each(responseErrors, function(index, value)
            {
                if (value.length != 0)
                {
                    $("#validation-errors").append('<p class="alert alert-error"><strong>'+ value +'</strong><p>');
                }
            });
            $("#validation-errors").show();
        } else {

          $('#user-avatar').attr('src',response.avatar);

        }
    }

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4. Process the uploaded image

Return to UsersController.php ##avatarUpload method, you can now process the uploaded image:

public function avatar()
    {
        $this->wrongTokenAjax();
        $file = Input::file('image');
        $input = array('image' => $file);
        $rules = array(
            'image' => 'image'
        );
        $validator = Validator::make($input, $rules);
        if ( $validator->fails() ) {
            return Response::json([
                'success' => false,
                'errors' => $validator->getMessageBag()->toArray()
            ]);

        }

        $destinationPath = 'uploads/';
        $filename = $file->getClientOriginalName();
        $file->move($destinationPath, $filename);
                return Response::json(
                    [
                        'success' => true,
                        'avatar' => asset($destinationPath.$filename),
                    ]
                );
            }



    }

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Note: Before uploading, confirm that it is created in laravel's
public/ directory uploads/ folder, and give corresponding permissions, such as:
sudo chmod -R 777 uploads/
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In the above

avatarUpload method, there is a wrongTokenAjaxMethod, this is used to test the token value of the Laravel system. It is also added in UsersController.php:

 public function wrongTokenAjax()
    {
        if ( Session::token() !== Request::get('_token') ) {
            $response = [
                'status' => false,
                'errors' => 'Wrong Token',
            ];

            return Response::json($response);
        }

    }

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5.Finally

A simple

Ajax demo for uploading images is now complete. In actual development, we also need to consider the following issues:

avatarUpload
method$file->move($destinationPath, $filename) <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">File::exists($username) or File::makeDirectory($username);</pre><div class="contentsignin">Copy after login</div></div>
avatar
field in the database, probably like this: Before the avatarUpload method returns the data, use a similar statement below ：<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">$user->avatar = your_avtar_upload_path; $user->save();</pre><div class="contentsignin">Copy after login</div></div>
```
function showResponse(response)  {

}
```
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, if the image is successfully returned, execute after
$('#user-avatar').attr('src',response.avatar)
: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> $('#user-avatar').Jcrop({ aspectRatio: 1, onSelect: updateCoords, setSelect: [120,120,10,10] });</pre><div class="contentsignin">Copy after login</div></div>You can implement image cropping on the front end, and then add the corresponding cropping data such as
height
,width,x-align of the cropped image. y-alignJust wait until it is sent to the backend for processing. If you use Intervention/Image, processing images on the backend is a piece of cake!

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