[larveral]Laravel 5 中基于 jQuery 实现分层级的类目树结构方法

时间:2020-12-06  来源:jquery  阅读:

今天,我要来分享下如何在Laravel 5中通过jQuery实现动态类目树结构:有些时候我们确实需要为类目及其子类目生成树结构以便于使用。

在本教程中,我只是简单在Laravel应用中创建一个“categories”表并通过一个嵌套的树结构来管理父类目和子类目。我使用jQuery来生成树视图布局,使用类目模型为层级数据设置关联关系,还为在类目树中创建新类目添加了表单。

在正式开始之前,先贴上最终效果图:

laravel-category-tree-view

下面正式开始开发之路。

第一步:安装Laravel 5.3应用

如果你还没有安装Laravel 5.3的话,那么第一步肯定是安装它。我们使用Composer进行安装:

composer create-project --prefer-dist laravel/laravel blog

如果没有Homestead之类的开发环境的话,需要在.env文件中配置数据库连接信息。

第二步:创建类目表和模型

在这一步中我们使用Laravel提供的Artisan命令为类目表生成迁移文件:

php artisan make:migration create_category_table

运行完该命令之后你会发现在database/migrations目录下新生成了一个迁移文件,编辑该文件代码如下:

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateCategoryTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create("categories", function (Blueprint $table) {
            $table->increments("id");
            $table->string("title");
            $table->integer("parent_id");
            $table->timestamps();
        });
    }

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

然后我们运行如下命令生成该表:

php artisan migrate

创建完数据表之后还需要创建一个与该数据表相对应的模型类app/Category.php:

namespace App;

use Illuminate\Database\Eloquent\Model;

class Category extends Model
{

    public $fillable = ["title","parent_id"];

    /**
     * Get the index name for the model.
     *
     * @return string
     */
    public function childs() {
        return $this->hasMany("App\Category","parent_id","id") ;
    }
}

第三步:创建路由

在这一步中我们需要创建两个路由,一个用于渲染类目树视图,一个用于添加新的类目。打开routes/web.php文件,添加如下两个路由:

Route::get("category-tree-view",["uses"=>"CategoryController@manageCategory"]);
Route::post("add-category",["as"=>"add.category","uses"=>"CategoryController@addCategory"]);

第四步:创建控制器

到了这里,我们需要创建路由中定义的控制器app/Http/Controllers/CategoryController.php,编写该文件代码如下:

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Category;

class CategoryController extends Controller
{
    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function manageCategory()
    {
        $categories = Category::where("parent_id", "=", 0)->get();
        $allCategories = Category::pluck("title","id")->all();
        return view("categoryTreeview",compact("categories","allCategories"));
    }

    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function addCategory(Request $request)
    {
        $this->validate($request, [
            "title" => "required",
        ]);
        $input = $request->all();
        $input["parent_id"] = empty($input["parent_id"]) ? 0 : $input["parent_id"];

        Category::create($input);

        return back()->with("success", "New Category added successfully.");
    }

}

第五步:创建视图

在这一步中,我们来创建两个Blade视图文件。首先是resources/views/categoryTreeview.blade.php:



   
        Laravel Category Treeview Example
       
       
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
       
   
   
       
           
                Manage Category TreeView
               
                   
                       
                           

Category List


                           

                                    @foreach($categories as $category)
                                        
                                         {{ $category->title }}
                                         @if(count($category->childs))
                                             @include("manageChild",["childs" => $category->childs])
                                         @endif
                                        
                                    @endforeach
                               
                           
                           
                               

    Add New Category

                                {!! Form::open(["route"=>"add.category"]) !!}

                                    @if ($message = Session::get("success"))
                                   
                                       
                                        {{ $message }}
                                   
                                    @endif

                                    has("title") ? "has-error" : "" }}">
                                        {!! Form::label("Title:") !!}
                                        {!! Form::text("title", old("title"), ["class"=>"form-control", "placeholder"=>"Enter Title"]) !!}
                                        {{ $errors->first("title") }}
                                   

                                    has("parent_id") ? "has-error" : "" }}">
                                        {!! Form::label("Category:") !!}
                                        {!! Form::select("parent_id",$allCategories, old("parent_id"), ["class"=>"form-control", "placeholder"=>"Select Category"]) !!}
                                        {{ $errors->first("parent_id") }}
                                   

                                   
                                       
                                   

                                {!! Form::close() !!}

                           
                       

                   
               
           
            <script src="/js/treeview.js"></script>
       

    然后是resources/views/manageChild.blade.php:


        @foreach($childs as $child)
       
            {{ $child->title }}
            @if(count($child->childs))
                @include("manageChild",["childs" => $child->childs])
            @endif
       
        @endforeach

    第六步:添加CSS和JS文件

    最后一步,我们来添加视图文件所需要的CSS和JS文件。

    public/css/treeview.css:

    .tree, .tree ul {
        margin:0;
        padding:0;
        list-style:none
    }
    .tree ul {
        margin-left:1em;
        position:relative
    }
    .tree ul ul {
        margin-left:.5em
    }
    .tree ul:before {
        content:"";
        display:block;
        width:0;
        position:absolute;
        top:0;
        bottom:0;
        left:0;
        border-left:1px solid
    }
    .tree li {
        margin:0;
        padding:0 1em;
        line-height:2em;
        color:#369;
        font-weight:700;
        position:relative
    }
    .tree ul li:before {
        content:"";
        display:block;
        width:10px;
        height:0;
        border-top:1px solid;
        margin-top:-1px;
        position:absolute;
        top:1em;
        left:0
    }
    .tree ul li:last-child:before {
        background:#fff;
        height:auto;
        top:1em;
        bottom:0
    }
    .indicator {
        margin-right:5px;
    }
    .tree li a {
        text-decoration: none;
        color:#369;
    }
    .tree li button, .tree li button:active, .tree li button:focus {
        text-decoration: none;
        color:#369;
        border:none;
        background:transparent;
        margin:0px 0px 0px 0px;
        padding:0px 0px 0px 0px;
        outline: 0;
    }
    public/js/treeview.js:

    $.fn.extend({
        treed: function (o) {

            var openedClass = "glyphicon-minus-sign";
            var closedClass = "glyphicon-plus-sign";

            if (typeof o != "undefined"){
                if (typeof o.openedClass != "undefined"){
                    openedClass = o.openedClass;
                }
                if (typeof o.closedClass != "undefined"){
                    closedClass = o.closedClass;
                }
            };

            /* initialize each of the top levels */
            var tree = $(this);
            tree.addClass("tree");
            tree.find("li").has("ul").each(function () {
                var branch = $(this);
                branch.prepend("");
                branch.addClass("branch");
                branch.on("click", function (e) {
                    if (this == e.target) {
                        var icon = $(this).children("i:first");
                        icon.toggleClass(openedClass + " " + closedClass);
                        $(this).children().children().toggle();
                    }
                })
                branch.children().children().toggle();
            });

            /* fire event from the dynamically added icon */
            tree.find(".branch .indicator").each(function(){
                $(this).on("click", function () {
                    $(this).closest("li").click();
                });
            });

            /* fire event to open branch if the li contains an anchor instead of text */
            tree.find(".branch>a").each(function () {
                $(this).on("click", function (e) {
                    $(this).closest("li").click();
                    e.preventDefault();
                });
            });

            /* fire event to open branch if the li contains a button instead of text */
            tree.find(".branch>button").each(function () {
                $(this).on("click", function (e) {
                    $(this).closest("li").click();
                    e.preventDefault();
                });
            });
        }
    });

    /* 初始化树状图 */
    $("#tree1").treed();

    好了,至此所有代码已经编写完成,你可以在浏览器中查看效果了。

    [larveral]Laravel 5 中基于 jQuery 实现分层级的类目树结构方法

    http://m.bbyears.com/wangyezhizuo/114793.html

    推荐访问:蜡染
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