blocks|key|381114|text|你可以像下面这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|381115|<select>
++++++++@foreach+($dropItems+as+$item)
++++++++++++{{--+*/+
++++++++++++++++$selected+=+'';
++++++++++++++++if+(+Input::has('group')+&&+Input::get('group')+==+$item)+{
++++++++++++++++++++$selected+=+'selected';
++++++++++++++++}
+++++++++++++/*+--}}
+++++++++++++<option+value="dayofweek"+{{+$selected+}}>Day+Of+week+</option>
++++++++@endforeach
++++</select>|code-block|syntax|javascript|381116|或者你可以用|381117|{!!+Form::select('day_drop_down',+$daysArray+,+(+Input::has('group')+&&++Input::get('group')+==+'')?Input::get('group'):0,+['class'+=>+'form-control',+'id'=>'productTemplate'])+!!}|381118|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can do like below,

<pre><code>&lt;select&gt;
 @foreach ($dropItems as $item)
 {{-- */ 
 $selected = '';
 if ( Input::has('group') &amp;&amp; Input::get('group') == $item) {
 $selected = 'selected';
 }
 /* --}}
 &lt;option value="dayofweek" {{ $selected }}&gt;Day Of week &lt;/option&gt;
 @endforeach
 &lt;/select&gt;
</code></pre>

OR you can use

<pre><code>{!! Form::select('day_drop_down', $daysArray , ( Input::has('group') &amp;&amp; Input::get('group') == '')?Input::get('group'):0, ['class' =&gt; 'form-control', 'id'=&gt;'productTemplate']) !!}
</code></pre>

blocks|key|1143791|text|问题是，您的控制器住在哪里？您正在进行服务器端编程吗？然后控制器和模型驻留在服务器上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1143792|如果您正在进行客户端编程，那么所有三个层都位于浏览器HTML/CSS+(视图)、Javascript+(Controller和Model)中。|1143793|如果是后者，那么您应该清除HTML：|1143794|<option+value="dayofweek">Day+Of+week+</option>|code-block|syntax|javascript|1143795|只有Javascript+(在控制器中)进行操作：|1143796|+val+=+get('group')+==+'dayofweek'+?+'selected'+:+''}}
$('dayofweek').val+=+val;|1143797|(对不起，javascript可能是错的.但你知道这个主意。)|1143798|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

The question is, where does your controller reside? Are you doing server side programming? Then the controller and the model reside on the server.

If you are doing client side programming then all three layers live in the browser HTML/CSS (the view), Javascript (Controller and Model).

If the later then you should have your HTML clean :

<pre><code>&lt;option value="dayofweek"&gt;Day Of week &lt;/option&gt;
</code></pre>

And only your Javascript (in the controller) does the manipulation :

<pre><code> val = get('group') == 'dayofweek' ? 'selected' : ''}}
$('dayofweek').val = val;
</code></pre>

(sorry the javascript is probably wrong... but you get the idea.)

blocks|key|381189|text|是的，您可以在视图中执行if语句。不这样做是疯狂的，因为这将意味着你的观点将完全是静态的，这是相当不切实际的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|381190|--但是--让这些语句依赖于类似于Input的东西可能是个坏主意。你的观点应该比这更解耦。假设您将在几种不同的场景中使用特定的视图；换句话说，许多不同的控制器可能希望呈现相同的视图。不能保证在所有这些场景中都使用了一个Input，或者具体地调用了这个输入。控制器应该处理直接输入，视图应该接收像控制器设置的$currentGroup这样的变量。您希望在输入和输出之间设置一些隔离，而不是立即将它们连接在一起，以提高可重用性和灵活性。|BOLD|381191|entityMap^0|C|2|0|0|4|H|5|31|5|49|D|0^^$0|@$1|2|3|4|5|6|7|K|8|@$9|L|A|M|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|N|8|@$9|O|A|P|B|H]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|I|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|J|$]]

Yes, you can do <code>if</code> statements in your view. It would be madness not to, since that would mean your views would be entirely static, which is pretty impractical.

However, it's probably a bad idea to have these statements depend on something like <code>Input</code>. Your views should be more decoupled than that. Imagine that you're going to use a particular view in several different scenarios; in other words, many different controllers may want to render the same view. There is no guarantee that an <code>Input</code> was used in every one of those scenarios, or what that input was called specifically. The controller should handle the direct input, the view should receive a variable like <code>$currentGroup</code> which the controller sets. You want to put some insulation between input and output, and not tie them together so immediately to increase re-usability and flexibility.

I'm pretty new to programming and I have a simple question about the MVC pattern. I started learning Laravel, which has views, controllers and models. 

My question is: Can I have <code>if</code>s like this one in my views? 

<code>&lt;option value="dayofweek" {{Input::get('group') == 'dayofweek' ? 'selected' : ''}}&gt;Day Of week &lt;/option&gt;</code>

I have several <code>&lt;option&gt;</code>s in my <code>&lt;select&gt;</code> and it looks kind of ugly, especially when I add additional statement to the condition <code>Input::has('group') &amp;&amp; ...</code>.

Should I build the select with its options in my controller since I have the same data there and perform all checks and then just let the view render selected and non-selected options?

PS: I know I can, but should I?

MVC - Can I do ifs in views

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我对编程非常陌生，对于MVC模式我有一个简单的问题。我开始学习Laravel，它有视图，控制器和模型。我的问题是:我的观点中能有像这样的if吗？<option value="dayofweek" {{Input::get('group') == 'dayofweek' ? 'selected' : ''}}>Day O...

问MVC -我可以在视图中执行ifs吗？
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