Yii2 dropDownList mark option selected

问题

Hi i'm trying to make a drop down list with selected value but there is still no progress, drop down is rendenering but always first option is selected.

$company_id = (int) $params['company_id'];
$options = [
    'options' => [
         $company_id => [
            'selected' => 'selected',
            'label' => 'test'
        ]
     ]
];
echo $form->field($model, 'company_id')->dropDownList($companies_list, $options);

whats wrong with that code? I edited my code and i set 'label' => 'test' in my option, and this works, but selected still not

Ok solution found, in framework code i found in renderSelectionOptions method :

$attrs = isset($options[$key]) ? $options[$key] : [];
$attrs['value'] = (string) $key;
$attrs['selected'] = $selection !== null &&
    (!is_array($selection) && !strcmp($key, $selection)
    || is_array($selection) && in_array($key, $selection));

so all what i need to do is :

$model->company_id = $company_id;

before rendering section

回答1:

Just a note for future visitors:

If you are using ActiveForm then value of your model field will be used as the selected value but if you are not using ActiveForm and generating dropdown list with Html helper then dropDownList function accepts another parameter selection as well, in which you can pass the value that you want to make selected, as mentioned in docs

回答2:

Please try this

for ($x = 1; $x <= 40; $x++) {
       if ($x=="1"){
            $items[$x] = $x." week";
        }else{
            $items[$x] = $x." weeks";
        }
    }
$weeks=28;
<?= Html::dropDownList('s_id', $selection = $weeks, $items, ['prompt' => '--Choose Week--','class'=>'form-control']) ?>

来源：https://stackoverflow.com/questions/27108609/yii2-dropdownlist-mark-option-selected