Learn JavaScript Coding example AJAX from JSON file PromiseALL multiple fetch requests to array URLs
Learn JavaScript Coding example AJAX from JSON file PromiseALL multiple fetch requests to array URLs AJAX JavaScript Fetch with PromiseAll Method for multiple URLs Exercise lesson to practice making fetch requests, using async and await with fetch and also how you can connect to multiple endpoints using promiseAll and return the results as one object value. Fetch can be used to connect to external files, like JSON and return the results of those data files into JavaScript code. The data needs time to load, that is why promises are used to handle the data once it’s ready and returned from the endpoint. Using async and await in the function can set up the promise to wait until a response is returned. Fetch can do the same with the chaining of then promises to handle the data once its arrived. You can also use promiseAll if there are multiple files that need to load data into one object. Once all the data is ready then the file contents can be used in the code and output on the page. Get source code at https://basescripts.com/ AJAX request example code exercise : Create 3 page buttons to make requests. Set up an element on the page to show the output of the results. Using the first button on click, connect to a json file and return the contents back using fetch. Output the results of the file onto the web page. The second button uses async on the main request function, and await to move to the next function once the request completes. Output the results of the file data into the web page. Create an array of the paths to several JSON files, with the same object structure in each file. Once the third button is pressed, use Promise.all to make fetch requests to each JSON file. Nest the map function within the Promise.all request, so that the code can iterate through each JSON file. Once all the requests are completed then output the content into the web page from the JSON files.