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:
<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
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