foreach Laravel-5< option选择 [英] foreach Laravel-5 <option select

问题描述

我尝试了很多代码变体，并试图在其他主题中找到类似的问题.因此，我有表用户，其中每个用户都有一个城市(存储为数字)，当然还有具有ID和城市名称的表城市(那里有40个城市).当真实用户打开其个人资料设置页面时，我希望选择并显示其城市.在此示例中，用户表"Alex"中的城市为"2".在表格city中:id为"2"，name_ru为"cityB".

I have tried a lot of variants of code and tried to find similar problem in other topics. So, i have table users where each user is having one city(stored as a number), and of course table city with id and name of city (40 cities is there). When real user open his profile settings page I want his city to be selected and and displayed in form. In this example in user table "Alex" is having city"2". In table city: id "2" and name_ru "cityB".

如果我尝试这样做:

@foreach(App\City::get() as $city)
<option value='{{ $city->id }}'>{{ $city->name_ru }}</option>
@endforeach

它仅显示城市，但我需要这样的结果:

It shows only cities, but I need result like this:

<option  value="1" > cityA</option>
<option selected value="2" > cityB </option>
<option value="3" > cityC </option>

所以问题是-如何只选择一个标签OPTION，其值等于该城市的编号，该标签存储在表用户中的"Alex".

So the question is - How to make SELECTED only one tag OPTION, which VALUE is equal to number of that city, which is stored in table users for "Alex".

我考虑了一下，但是什么也没显示:

I thought about this, but it shows nothing:

@foreach(App\City::get() as $city)
@if($user->city ==1)
<option selected value="1" > {{ $city->name_ru }}</option>
@elseif($user->city ==2)
<option selected value="2" > {{ $city->name_ru }}</option>
....
@endif
@endforeach

如果我尝试这样做:

@foreach(App\City::get() as $city)
@if($user->city ==1)
<option selected value="1" > {{ $city->name_ru }}</option>
@endif
@endforeach

@foreach(App\City::get() as $city)
@if($user->city ==2)
<option selected value="2" > {{ $city->name_ru }}</option>
@endif
@endforeach

@foreach(App\City::get() as $city)
@if($user->city ==3)
<option selected value="3" > {{ $city->name_ru }}</option>
@endif
@endforeach

我得到:

<option selected value="2" > cityA</option>
<option selected value="2" > cityB</option>
<option selected value="2" > cityC</option>

请帮助

推荐答案

尝试一下:

@foreach(App\City::get() as $city)
$selected = '';
if($city->id == 1)    // Any Id
{
    $selected = 'selected="selected"';
}
// $selected is initially empty and when the if criteria met it contains selected which make dropdown selected
<option value='{{ $city->id }}' {{$selected}} >{{ $city->name_ru }}</option>
@endforeach

已编辑:在视图上从类似 App \ City :: get()的模型中获取数据不是一个好主意，而是在控制器上获取并将其传递给视图是正确的方法.

Edited: fetching data from models like App\City::get() on view is not a good idea, instead fetch it on controller and pass it on to the view is the right way.

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