Select2 Krajee widget - using modal and getting the id of the value - yii2

Question

What is the way to get the value of the select item with modal. As it is shown in demo example (Using a select2 widget inside a modal dialog):
Modal::begin([
'options' => [
'id' => 'kartik-modal',
'tabindex' => false // important for Select2 to work properly
],
'header' => '<h4 style="margin:0; padding:0">Select2 Inside Modal</h4>',
'toggleButton' => ['label' => 'Show Modal', 'class' => 'btn btn-lg btn-primary'],
]);
echo Select2::widget([
'name' => 'state_40',
'data' => $data,
'options' => ['placeholder' => 'Select a state ...'],
'pluginOptions' => [
'allowClear' => true
],
]);
Modal::end();
I get the options to be shown and select, but I need id of the selected value to be saved somewhere so I can get it to be forwarded as part of the link in button.
For example:
Html::button('Example', ['value' => Url::to(['example/example', 'id' => ?]),'class' => 'btn btn-lg btn-primary ']);

Answer 1

this is a easy way. I´ve done it many times.
'options' => [
'class'=>'col-md-3','id'=>'id_select',
'placeholder' => 'Select the country',
],
with jquery :
var id_select = $('#id_select').val();
Or if you prefer ajax:
echo Html::a('<i class="fa fa-check"></i> Send',null,[
'class' => 'btn btn-primary',
'title' => Yii::t('yii', 'Enviar'),
'onclick'=>"
var id_select = $('#id_select').val();
$.ajax({
type:'post',
cache : false,
url : '".Url::toRoute(['example'])."&id='+id_select,
success : function(response) {
//ok
},
error: function() {
alert('Error');
}
});
]);
you can´t get all parameters with php, you need client languaje for get this.
However I´d invite you to use <form> with model, is more easy and fast.