//CODE

//FRONT END

//elements: 1. dynamicDataset; 2. likeButton; 3. likesText (connected to the likes field via the dataset)

import wixData from 'wix-data';

$w.onReady(function () {

    $w("#dynamicDataset").onReady(() => {

        let item = $w("#dynamicDataset").getCurrentItem();

        $w("#likeButton").onClick((event) => {

            $w("#likesText").text = (Number($w("#likesText").text) + 1).toString();

            item.likesUpdate = true;

            wixData.update("collectionName", item).then(() => { $w("#dynamicDataset").refresh();})

        })

    })

});

​

//BACK  END

//filed in collection: field key: likes; Field Type: Number;

//backend/data.js

import wixData from 'wix-data';

 

export function collectionName_beforeUpdate(item, context) {

    if (item.likesUpdate) {

        return wixData.get(context.collectionName, item._id, { "suppressHooks": true })

            .then(itemToUpdate => {

                itemToUpdate.likes ? itemToUpdate.likes += 1 : itemToUpdate.likes = 1;

                return itemToUpdate;

            })

    }

    return item;

}

//replace the text in red by your real collection name

​