Yii2 - Removing an item from the dropDownList - php

Question

In my ticket form I have a dropDownList for the employees, and in the employees model I have employee_status which is 'Available', 'Not Available'
If I change the status of the employee to 'Not Available' how am I going to remove it automatically from the dropDownList in Ticket form?
The Employee Dropdown from Ticket
<?= $form->field($model, 'employee_id')->dropDownlist(
ArrayHelper::map(Employee::find()->all(), 'id', 'employee_name'),
[
'prompt' => 'Select Employee ID',
'style' => 'width:200px'
]); ?>

Answer 1

You need to create a dependent dropdown for get employee list according to employee_status.Write down below code in view file for creating dependent dropdown :-
use yii\helpers\ArrayHelper;
echo $form->field($model, 'employee_status')->dropDownList([0=>'Available' , 1 => 'Not Available'],
[
'prompt' => 'Select Employee Status',
'style' => 'width:200px',
'onchange'=>'$.post( "'.Yii::$app->urlManager->createUrl('site/get-employee?status=').'"+$(this).val(), function( data ) {
$( "select#employee-employee_id" ).html( data );
});']);
<?= $form->field($model, 'employee_id')->dropDownlist(
ArrayHelper::map(Employee::find()->all(), 'id', 'employee_name'),
[
'prompt' => 'Select Employee ID',
'style' => 'width:200px'
]); ?>
Now write a controller action for get data for child dropdown. Controller action code like below :-
SiteController.php
public function actionGetEmployee($status)
{
$employee= \common\models\Employee::find()
->where(['status' => $status])
->orderBy('id DESC')
->all();
if (!empty($employee)) {
foreach($employee as $employee) {
echo "<option value='".$employee->id."'>".$employee->name."</option>";
}
} else {
echo "<option>-</option>";
}
}
Note : change the model namespace according to your code.

Answer 2

Perform a find query with your given criteria.
Since we only ever want available employees in our list, we can write:
Employee::find('status=:status', [
':status' => 'Available'
])->all();

Answer 3

I finally get it
<?= $form->field($model, 'employee_id')->dropDownlist(
ArrayHelper::map(Employee::find()->where(['status' => 'Available'])->all(), 'id', 'employee_name'),
[
'prompt' => 'Select Employee ID',
'style' => 'width:200px'
]); ?>