如何在Yii2应用程序的多选下拉列表中显示选定的值？ [英] How to display selected values in multiple select dropdown in a Yii2 app?

问题描述

我正在研究Yii2。我正在使用这样的自定义数组创建多个选择下拉列表。

I am working on Yii2. I am creating multiple select drop down using custom array like this.

在控制器文件中：

$all_groups = Groups::find()->where(['=','group_created_by',$id])->orwhere(new Expression('FIND_IN_SET(:id_to_find, group_managers)'))->addParams([':id_to_find' => $id])->all(); // fetch all values

$selected_groups  = Groups::find()->where(['=','group_users',$updateId])->orwhere(new Expression('FIND_IN_SET(:id_to_find, group_users)'))->addParams([':id_to_find' => $updateId])->all(); // getting selected values

$all_groups_array = [];

 foreach ($all_groups as $group) {
     $all_groups_array[$group->id] = ucfirst($group->group_name);
 }

在视图上渲染数据：

return $this->render('mngr_userupdate', [
                        'model' => $model,
                        'all_groups_array'=>$all_groups_array,
                        'case'=>$case,
                        'email_error' => 'false',
                        'applied_email' =>   '' ,
                      ]);

因此它正在创建像这样的数组：

so it is creating array like this:

Array
(
    [11] => Mngr1 group
    [14] => Mngr 11 Group
)

竞争文件：

 <?= $form->field($model, 'group_user[]')->dropDownList($all_groups_array,['multiple' => 'multiple']) ?>

在创建用于插入数据的表单时效果很好。但是如何创建一个数组，我可以使用该数组在更新表单上显示选定的值。

It is working fine on create form for data insertion. but how to create array using which I can display selected values on update form.

编辑：

我刚刚发现，如果我像

<?= $form->field($model, 'group_user[]')->dropDownList($all_groups_array,['multiple' => 'multiple', 'options'=>['14'=>["Selected"=>true],'11' => ["Selected"=>true]]]); ?>

然后它将开始显示所选的值。即我必须创建一个像这样的数组

then it will start display values as selected. i.e. I have to create array like

[
'14'=>["Selected"=>true],
'11' => ["Selected"=>true]
]

为此，我正在使用像如下：

For this I am using loop like as follows:

foreach ($selected_groups as $key => $value) {
           $sel_groups_array[$value] = '' // what should be there or else
          }

如何创建

推荐答案

我已经创建了我的问题的解决方案，以防万一有人遇到此类问题，可以使用如下所示的循环：

I have created solution of my question, In case if anyone has the such kind of problem then he can use the loop like as follows:

foreach ($selected_groups as $group) {

  $sel_groups_array[$group->id] = array("selected"=>true);
}

在视图文件中，您可以使用数组将选定的多个值显示为如下：

and in the views file you can use the array for display selected multiple values as follows:

<?= $form->field($model, 'group_user[]')->dropDownList($all_groups_array,['multiple' => 'multiple','options' => $sel_groups_array]); ?>

由于该结构在更新表单上显示多个选定值，因此应如下所示：

Because the structure to display multiple selected values on update form, it should be like as follows:

$form->field($model, 'group_user[]')->dropDownList($all_groups_array,['multiple' => 'multiple', 'options'=>['14'=>["Selected"=>true],'11' => ["Selected"=>true]]]); 
// here 14 and 11 I am using as example

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