通过选择yii 2中的下拉列表来更新textinput值

问题描述：

I'm very new to Yii and I'm trying to update a value of an textinput , depending on the value selected on a dropdown list. in my view I have this inside my active form

<?= $form->field($model, 'quantity')->textInput(['readonly' => !$model->isNewRecord]) ?>//this is an integer

<?= $form->field($model, 'allowquantity')->dropdownlist(['yes' =>'yes','no'=>'no']) ?>

I want to be able to change the value of the field quantity, depending on the selected value in dropdownlist. example, if i choose yes in the dropdown, it will retain the value in the quantity field. I choose no , it will turn the value to 0. this will happen in my update form so that i can update the values in the database. Any help will be much appreciated

我是Yii的新手，我正在尝试更新textinput的值，具体取决于值在下拉列表中选择。在我看来，我在我的活动表格中有这个 p> ＆lt;？= $ form-＆gt;字段（$ model，'quantity'） - ＆gt; textInput（['readonly '=＆gt;！$ model-＆gt; isNewRecord]）？＆gt; //这是一个整数＆lt;？= $ form-＆gt;字段（$ model，'allowquantity'） - ＆gt; dropdownlist（[' 是'=＆gt;'是'，'不'=＆gt;'不']）？＆gt; code> pre>

我希望能够更改值字段数量，取决于下拉列表中的选定值。例如，如果我在下拉列表中选择“是”，它将保留数量字段中的值。我选择不，它会将值转为0.这将在我的更新表单中发生，以便我可以更新数据库中的值。任何帮助将不胜感激 p> div>

答

Change your dropdown , make sure #quantity is the id of quantity textbox

echo $form->field($model, 'allowquantity')->dropDownList(['yes' =>'yes','no'=>'no'], 
             ['prompt'=>'-Choose a option-',
              'onchange'=>'if($(this).val() == "no"){
                 $("#quantity").val("0"); }'
              ]);

通过选择yii 2中的下拉列表来更新textinput值

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