Yii2: can I customize just the input part of an ActiveField?

In How to custom input field in yii2? it shows how you can change the entire template when using $form->field($model, 'customer_name') to generate the HTML for a field in an ActiveForm.

But is there a way to modify just the HTML generated by the {input} tag in that template?

I would like to have Yii generate all the HTML for the label and error messages, but want to generate the actual input field myself (eg. due to limitations in Yii's dropDownList() features).

Solution

Extend ActiveField class (in my case \yii\bootstrap4\ActiveField) and override render function, then set $this->parts['{input}' with your custom code. e.g:

<?php

namespace common\widgets;

class MyCustomInput extends \yii\bootstrap4\ActiveField {
    public function render($content = null) {
        $this->parts['{input}'] = '<h3>This is my custom code for input.</h3>';

        return parent::render($content);
    }
}

NOTE: Remember you can get field's attributes using methods like:

\yii\helpers\Html::getInputName($this->model, $this->attribute)

$this->getInputId()