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I was wondering if it were possible to send an AJAX Post over to a controller contained within a custom module I have created. The reason for doing this is because I want to separate my logic out from the module-sales module.

Alternatively, would it be possible to contain the controller within Magento_Sales as currently my folder structure for this just contains overridden frontend files such as layout / template etc. Any help appreciated on this, cheers

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It is possible to create a controller and return a Json from it that you can process on success.

An example :

JS file

 var responseajax = $.ajax({
                    url: action,
                    data: formData,
                    dataType: 'json'
                });

Note that you can build an url with the urlBuilder :

Include the urlbuilder like this :

define(
    [
        'jquery',
        'mage/url',
    ],
    function ($, url) {
... 
                var url= url.build('path/to/controller');
...

Your controller will need to return a json

....
    public function __construct(
        Context $context,
        JsonFactory $jsonFactory,
        Data $jsonHelper,
    )
    {
....
        $this->_jsonFactory = $jsonFactory;
        $this->_jsonHelper = $jsonHelper;
        parent::__construct(
            $context
        );
    }

public function execute(){
$arraydata = your array data
        return $this->_jsonFactory->create()->setJsonData($this->_jsonHelper->jsonEncode($arraydata ));

}

And after that just process the data with your JS

...
responseajax.success(function (response) {
...
response is your json array or Object
....
}
...

This answer is based on the fact that you know how to create a basic route and controller.

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