Laravel 5 基础(十一)- 子视图和表单复用
我们需要处理编辑文章的问题。当然我们可以手工添加新的路由,就像这样:
<code>Route::get('/articles/{id}/edit', '[email protected]');</code>
让我们在命令行下使用 artisan
的 route:list
来查看我们当前的路由:
<code>php artisan route:list</code>
在符合 RESTful 的情况下,可能直接使用 laravel 的 resource
路由是一种好的选择,然我们将所有的路由都去掉,只添加唯一的一个:
<code>Route::resource('articles', 'ArticlesController');</code>
再次使用 <code>php artisan route:list</code> 查看路由,哇,一堆的符合我们期望的路由产生了。每一项都仔细查看一下。
现在在控制器中添加方法:
<code> public function edit($id) { $article = Article::findOrFail($id); return view('articles.edit', compact('article')); }</code>
现在创建视图
<code>@extends('layout')@section('content') <h1 id="Edit-article-title">Edit: {!! $article->title !!} </h1> <hr/> ...</code>
好吧,我承认这些代码都是从 create.blade.php
中拷贝出来的,修改了一下,问题是我们需要重复吗?后面我们会处理这个问题,现在来看一下表单的提交问题。在路由中 <code>php artisan route:list</code> ,再看一遍,修改使用了 PATCH
方法,我们来修改视图:
<code>{!! Form::open(['method' => 'PATCH', 'url' => 'articles/' . $article->id]) !!} </code>
在浏览器中访问 /articles/1/edit
,查看一下源代码,发现laravel自动生成了 _method=PATCH
的隐藏字段。
一问题是,我们编辑文章,但是文章的信息并没有显示出来,我们修改一下视图:
<code> {!! Form::model($article, ['method' => 'PATCH', 'url' => 'articles/' . $article->id]) !!}</code>
OK,everything's ok,除了 published_on
字段仍然设置为当前日期,后面我们来处理。
现在在控制器中添加方法:
<code> public function update($id, \Illuminate\Http\Request $request) { $article = Article::findOrFail($id); $article->update($request->all()); return redirect('articles'); }</code>
我们在修改的过程中也需要验证,让我们复用我们的 Request 类,将 CreateArticleRequest
更名为更通用的 ArticleRequest
,别忘了修改 store
方法中的参数。
<code> public function update($id, Requests\ArticleRequest $request) { $article = Article::findOrFail($id); $article->update($request->all()); return redirect('articles'); }</code>
现在剩下的问题是我们的新建和编辑使用了大部分相同的代码,比如显示错误,但他们存在两份,我们来修改这个问题。
我们直接在 views/articles
下面新建文件 list.blade.php
,并把错误处理代码从 create.blade.php
中拷贝出来:
<code>@if ($errors->any()) <ul class="alert alert-danger"> @foreach($errors->all() as $error) <li>{{ $error }}</li> @endforeach </ul>@endif</code>
在 create.blade.php
只需用下面语句替换错误处理代码即可:
<code>@include('articles.list')</code>
让我们再来处理表单代码,表单代码中除了 form
不大一样和提交按钮有区别,其他都差不多。我们创建一个视图 articles/form_partial.blade.php
,将代码拷贝出来
<code><div class="form-group"> {!! Form::label('title', 'Title:') !!} {!! Form::text('title', null, ['class' => 'form-control']) !!}</div><div class="form-group"> {!! Form::label('body', 'Body:') !!} {!! Form::textarea('body', null, ['class' => 'form-control']) !!}</div><div class="form-group"> {!! Form::label('published_at', 'Publish On:') !!} {!! Form::input('date', 'published_at', date('Y-m-d'), ['class' => 'form-control']) !!}</div><div class="form-group"> {{--这里要设置变量,依据是编辑还是修改来改变,当然也可以不放置在partial中--}} {!! Form::submit($submitButtonText, ['class' => 'btn btn-primary form-control']) !!}</div></code>
修改 create.blade.php
<code>@extends('layout')@section('content') <h1 id="Write-a-New-Article">Write a New Article</h1> <hr/> @include('articles.list') {{--使用我们添加的 illuminate\html 开源库--}} {!! Form::open(['url' => 'articles']) !!} @include('articles.form_partial', ['submitButtonText' => 'Add Article']) {!! Form::close() !!}@stop</code>
修改 edit.blade.php
<code>@extends('layout')@section('content') <h1 id="Edit-article-title">Edit: {!! $article->title !!} </h1> <hr/> @include('articles.list') {{--使用我们添加的 illuminate\html 开源库--}} {!! Form::model($article, ['method' => 'PATCH', 'url' => 'articles/' . $article->id]) !!} @include('articles.form_partial', ['submitButtonText' => 'Update Article']) {!! Form::close() !!}@stop</code>

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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