Laravel 简单实现Ajax滚动加载示例

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概述

开发H5项目的时候我们总是需要用到下拉滚动刷新的方式加载页面。这里用 Laravel 实现一下，直接上代码：

创建模型

这里我们不妨创建一个文章（Post）模型，并且生成测试数据 50 条吧。

php artisan make:model -m

模型Post.php

namespace App;

use IlluminateDatabaseEloquentModel;

class Post extends Model
{

 public $fillable = ['title','description'];

 
}

迁移文件

use IlluminateDatabaseSchemaBlueprint;
use IlluminateDatabaseMigrationsMigration;

class CreatePostTable extends Migration
{
 /**
  * Run the migrations.
  *
  * @return void
  */
 public function up()
 {
  Schema::create('posts', function (Blueprint $table) {
   $table->increments('id');
   $table->string('title');
   $table->text('description');
   $table->timestamps();
  });
 }

 /**
  * Reverse the migrations.
  *
  * @return void
  */
 public function down()
 {
  Schema::drop("posts");
 }
}

测试数据 ModelFactory.php

$factory->define(AppPost::class, function (FakerGenerator $faker) {
 return [
  'title' => $faker->sentence,
  'description' => $faker->paragraph,
 ];
});

填充

<?php

use IlluminateDatabaseSeeder;

class DatabaseSeeder extends Seeder
{
 /**
  * Run the database seeds.
  *
  * @return void
  */
 public function run()
 {
  // $this->call(UsersTableSeeder::class);
  factory(AppPost::class, 50)->create();
 }
}

路由

Route::get('my-post', 'PostController@myPost');

控制器

namespace AppHttpControllers;

use IlluminateHttpRequest;
use AppHttpRequests;
use AppPost;

class PostController extends Controller
{

 public function myPost(Request $request)
 {
  $posts = Post::paginate(6); 

  if ($request->ajax()) {
   $view = view('data',compact('posts'))->render();
   return response()->json(['html'=>$view]);
  }

  return view('my-post',compact('posts'));
 }

}

视图文件 resources/view/my-post.php

<!DOCTYPE html>
<html>
<head>
 <title>Laravel 分页滚动加载</title>
 <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
 <link href="http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="external nofollow" rel="stylesheet">
 <style type="text/css">
  .ajax-load{
   background: #e1e1e1;
   padding: 10px 0px;
   width: 100%;
  }
 </style>
</head>
<body>

<div class="container">
 <h2 class="text-center">Laravel 分页滚动加载</h2>
 <br/>
 <div class="col-md-12" id="post-data">
  @include('data')
 </div>
</div>

<div class="ajax-load text-center" style="display:none">
 <p>![](./loader.gif)加载更多……</p>
</div>

<script type="text/javascript">
 var page = 1;
 $(window).scroll(function() {
  if($(window).scrollTop() + $(window).height() + 1>= $(document).height()) {
   page++;
   loadMoreData(page);
  }
 });

 function loadMoreData(page){
  $.ajax(
   {
    url: '?page=' + page,
    type: "get",
    beforeSend: function()
    {
     $('.ajax-load').show();
    }
   })
   .done(function(data)
   {
    //console.log(data.html);
    if(data.html == " "){
     $('.ajax-load').html("没有数据了……");
     return;
    }
    $('.ajax-load').hide();
    $("#post-data").append(data.html);
   })
   .fail(function(jqXHR, ajaxOptions, thrownError)
   {
    alert('服务未响应……');
   });
 }
</script>

</body>
</html>

resources/view/data.php

@foreach($posts as $post)
<div>
 <h3><a href="">{{ $post->title }}</a></h3>
 <p>{{ str_limit($post->description, 400) }}</p>

 <div class="text-right">
  <button class="btn btn-success">Read More</button>
 </div>

 <hr style="margin-top:5px;">
</div>
@endforeach

效果：