This is skeleton code example on posting form data in JSON format processing by Yii’s controller action. Although this example uses Yii, the code can be easily adaped to pure PHP code.
Want to navigate through the grids or trying to sort and filter data without waiting for the entire page to load? You need yii\widgets\Pjax and wrap it around GridView.
In Yii V1, you use CJuiAutoComplete widget which displays an autocomplete field. There’s equivalent widget in Yii2 but I’ve not tried it yet because I tried something developed by external parties before I knew it exists. I’ve had successful use with the Typeahead widget, which is a wrapper class for Twitter Typeahead jQuery plugin.
Export is not available from the built-in GridView widget. However there’s an enhanced GridView widget that include this functionality, along with many other features missing from the built in widget.