Laravel asynchronous request implementation

In web applications, asynchronous requests are a very useful technology. By executing requests in the background, it avoids the waste of time caused by waiting for the server response on the front end, and also improves the user experience. In the Laravel framework, we can use some methods to implement asynchronous request functions.

1. What is asynchronous request

Asynchronous request is a technology that sends a request to the server and processes the request in the background without refreshing the entire page. This technology can be applied in different scenarios, such as when we need to display the progress bar of a certain task or need the payment page to refresh automatically so that customers can feel the success of their payment.

2. How to use asynchronous requests in Laravel

1. Use the ajax method in jQuery to implement asynchronous requests.

You can easily use it with jQuery in Laravel to implement the function of asynchronous requests. We can complete this process through the following steps:

First, we need to introduce the jQuery library file. This step can be done in the header or at the top of our HTML template:

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>

Next, we need to write the code to send the asynchronous request. This code snippet can be included in any event handling function, such as after the user clicks a button:

$(document).ready(function(){
    $('#btn-submit').click(function(e){
        e.preventDefault();
        $.ajax({
            type: 'POST',
            url: '/payment',
            data: {
                'amount': $('#amount').val(),
                'payment_method': $('#payment_method').val(),
                '_token': $('input[name="_token"]').val()
            },
            success: function(data){
                console.log('success');
                console.log(data);
                //在此处将返回的data数据展示在前端页面上
            },
            error: function(XMLHttpRequest, textStatus, errorThrown) {
                console.log('error');
                console.log(XMLHttpRequest);
                console.log(textStatus);
                console.log(errorThrown);
            }
        });
    });
});

2. Use Laravel's queue function to implement asynchronous requests.

The bottom layer of Laravel comes with a queue system for executing tasks in the background. By using a queuing system, we can avoid the problem of clients waiting for long times for server responses, and we can also manage the execution of all background tasks for better scheduling and optimization.

Next, we will use Laravel's queue system to define the processing steps of asynchronous requests.

First, we need to define a new task class. This class needs to inherit the native Laravel task class and implement the handle() method in this class. The basic template can be as follows:

namespace AppJobs;
use IlluminateBusQueueable;
use IlluminateContractsQueueShouldQueue;
use IlluminateFoundationBusDispatchable;
use IlluminateQueueInteractsWithQueue;
use IlluminateQueueSerializesModels;

class ProcessPayment implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    protected $amount;
    protected $paymentMethod;

    /**
     * Create a new job instance.
     *
     * @return void
     */
    public function __construct($amount, $paymentMethod)
    {
        $this->amount = $amount;
        $this->paymentMethod = $paymentMethod;
    }

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle()
    {
        //在此处执行异步请求所需的所有工作，比如HTTP请求或电子邮件发送。

        //处理请求完毕后将结果保存在数据库中，供前端页面读取。
    }
}

Next, we can put the processing logic of asynchronous requests in the handle() method. By performing this task on the backend, you can avoid the problem of poor user experience caused by page freezes, and at the same time, the entire request will not be slowed down by the execution time of the backend.

Finally, we can trigger this task in a controller method to implement asynchronous request processing. For example:

public function submitPayment(Request $request)
{
    $amount = $request->input('amount');
    $method = $request->input('payment_method');
    ProcessPayment::dispatch($amount, $method); //触发异步请求任务
    return response()->json(['message' => 'success']);
}

3. Summary

Asynchronous requests play a very important role in the development of Web applications. Using asynchronous request technology can make our applications run faster and smoother, thus improving the user experience. In the Laravel framework, we can use jQuery's ajax method or Laravel's queue system to implement asynchronous request functions. No matter which method you use, it's important to keep in mind: asynchronous requests make applications faster, more efficient, and more user-friendly. I hope this article can help you when implementing asynchronous requests.

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