Laravel使用默认值设置创建表单选择

Question

Controller:

$employee = Staff::where('staff_id', '=', $id)->where('user_role', '=','Employee')->first();
$emp_loc = $employee->locations()->pivot()->only('loc_id');
$locations_list = Location::lists('address1', 'loc_id'); //get list of locations

View:

<!--location -->
<div class="control-group">
<label class="control-label">Location</label>
<div class="controls">
@if(isset($emp_loc))
{{ Form::select('location', $locations_list, $emp_loc) }}
@else
{{ Form::select('location', $locations_list) }}
@endif
</div>
</div>

The third parameter is meant to be the default value for the select box however it always begins at the first value.

Source Code:

<div class="control-group">
<label class="control-label">Location</label>
<div class="controls">
<select name="location"><option value="1">Bethel</option><option value="2">Brooklyn</option><option value="3">Germantown</option><option value="4">Memphis</option><option value="5">Brooklyn</option></select>        </div>
</div>

No default value set?

Answer 1

It might be a database configuration problem.

Go back to the migration file and make sure your foreign keys are set properly. This is what I would do to properly set them:

Schema::create('pivot', function(Blueprint $table) {
  $table->increments('id');
  $table->unsignedInteger('loc_id');
  $table->foreign('loc_id')
   ->references('id')->on('location_list');
  .....
}

Schema::create('location_list', function(Blueprint $table) {
  $table->increments('id');
  .....
}

Moreover, pay attention that in Firefox the selected value is not displayed properly. To fix this, change your drop-down list to (in Blade):

Form::select('location', $locations_list, $emp_loc, array('autocomplete'=>'off'))

This last part is a weird behavior of Firefox