'Pass variable from custom hook to TPL file

I have created a custom module. Which simply registers a hook, whose only function is to obtain a list of products of a specific category.

The hook works perfectly. Then I call it from a TPL file, it is called correctly, but when I try to get the hook variable from the TPL file, I can't.

This is the code of my Hook.

    public function hookDisplayCaronteCategories($params){

        if (array_key_exists('max', $params)) {
            $max = $params['max'];
        }
        else{
            $max = 1000;
        }

        $category = new Category(
            $params['id_category'], //id de la categoría
            (int)Context::getContext()->language->id // id del idioma
        );
        $caronteProducts = $category->getProducts(
            (int)Context::getContext()->language->id, //id lenguaje
             1, //número de páginas
             $max, //productos por páginas
             'date_add', //order by
             'DESC', //order way
             false, //get total
             true, //mostrar activos
             false, // random
             1, // random_number_products
             true, //check access
             Context::getContext() //context
        );
        $this->smarty->assign(array('caronteProducts', $caronteProducts));
        return $this->display('http://localhost/rapture/themes/classic_child/templates/cms/page-6.tpl');
    }

The var_dump function at the end correctly displays the product data.

However, if I do a var_dump from the tpl, the function returns null. This is how I call the hook from the tpl.

      {hook h="displayCaronteCategories" id_category=11}
      {$caronteProducts|var_dump}

And this is what I get:

How can I get the hook variable in the tpl file?

Thank you.

Solution 1:^[1]

tldr: you need to send ajax request

As far as I know, tho. There are three ways to render page:

sending whole html page (with jinja params like you do in your example code)
sending json to client app
sending html with ajax to replace some element's inners

First method requires whole page reload.

I try to avoid writing js code when it's possible. Here is a nice js library htmx, which allows you to create axaj requests with html attributes.

main.py:

from flask import Flask, render_template, request

app = Flask(__name__)


@app.route('/')
def startup():
    return render_template('Loans.html')


@app.route('/bsearch', methods=['POST'])
def bsearch():
    '''Returns book name html'''
    found = "T"

    try:
        book_id = int(request.form["bid"])
        book_id = book_id if book_id >= 0 else None
    except BaseException:
        book_id = None

    i = 'idk what is `i` but that does not matter anyway'
    info = {i: [
        "Book 0",
        "Book 1",
        "Book 2",
        "Book 3",
        "Book 4",
        "Book 5",
    ]}

    
    if found == "T":
        try:
            html = info[i][book_id]
        except BaseException:
            html = "Book is not found"
    else:
        html = "Book is not found"

    return html


if __name__ == "__main__":
    app.run(debug=True)

Loans.html:

<html>

<head>
    <script src="https://unpkg.com/[email protected]"></script>
</head>

<body>
    <form hx-post="{{ url_for('bsearch') }}" hx-target="#returned_html_goes_here">
        Book id
        <br>
        <input type="text" name="bid" />
        <input type="submit" value="Search for books" /> 
    </form>
    <b>Book name: </b> <div id="returned_html_goes_here"></div>
</body>

</html>

You still can manually write ajax request function, but I think that's a waste of time when you can do the same thing with html.

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'Pass variable from custom hook to TPL file

Solution 1:[1]

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Solution 1:^[1]