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AJAXnotes.js
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AJAXnotes.js
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// AJAX is all about making requests via JS, in the browser, without the page refreshing.
// Asynchronous JavaScript And XML.
// Traditional browser requests happen in response to:
// - Entering a URL in the browser bar.
// - Clicking on a link.
// - Submitting a form.
// In all cases:
// - Browser makes request
// - Receives response
// - Replaces entire resource with result
// Around 1996, different browser adding new ways to make requests but with JavaScript.
// We can now make websites where we can load content from an API, from a server somewhere, make a request,
// get data back, and we don't have to refresh the page.
// AJAX is a concept or a way of srtucturing webpages in making requests.
// Reddit is so good that it makes all kinds of requests even you simply hover your mouse over items
// on pages (probably so it can collect info for ads, who knows?).
// Why use AJAX?
// - Don't need to reload entire page if just 1 thing is changing.
// - Interactive web sites.
// - Fewer full page loads from server. Your JS can talk to other servers directly.
// - Less info has to go across network.
// AJAX with Axios
// XMLHttpRequest is an old clunky, first request interface. Annoying syntax.
// To start a server on the teriminal, type $ python3 -m http.server (works if you downloaded python3)
// In the browser type in localhost:8000
// Can easily include Axios using a CDN link: <script src="https://unpkg.com/axios/dist/axios.js"></script>
// Making a Simple Request
// axios.get(url)
// Make GET request to that URL
// Not what we expected:
const response = axios.get('https://swapi.co/api/planets/')
console.log(response);
// "Promise {<pending>}"
// For now ignore what a promise is until we learn about Node.
// For now, all you need to know is that a promise is like a placeholder for a future value.
// At the moment, we don't have the value, because axios.get() doesn't actually get it itself.
// We want to wait for the promise to have that value before proceeding.
// But we don't know when the promise will receive its value!
// Asynchronicity
// AJAX requests are asynchronous. Async and Await will be important.
// - axios.get() completes before the response is received
// - This means that if we want to use the data we get back from our AJAX requests,
// we need to wait until the response has been given to us.
async function getData(){
const response = await axios.get('https://swapi.co/api/planets/')
console.log(response);
console.log("THIS LINE IS AFTER AXIOS.GET");
}
// Finally works. AJAX even parses the JSON object into regular JS automatically.
// With XHR we had to parse it manually.
// If you just want the names:
async function getData(){
const response = await axios.get('https://swapi.co/api/planets/')
for(let planet of response.data.results){
console.log(planet.name)
}
}
// Multiple Requests
async function getData(){
const response = await axios.get('https://swapi.co/api/planets/')
const {next, results} = response.data;
console.log(next); // a url should pop out
for(let planet of results){
console.log(planet.name)
}
const response2 = await axios.get(next)
const results2 = response2.data.results;
for(let planet of results2) {
console.log(planet.name)
}
}
// SpaceX Launch Data
async function getLaunches(){
const res = await axios.get('https://api.spacexdata.com/v3/launches/upcoming');
const ul = document.querySelector("#launches");
for(let launch of res.data){
const newLi = document.createElement('li');
newLi.inerText = launch.mission_name;
ul.append(newLi)
// console.log(launch.mission_name)
// console.log(launch.rocket.rocket_name)
}
}
// For manipulating the DOM
// <button id="getLaunches">Get Upcoming Launches</button>
// <ul id="launches"></ul>
// run getLaunches()
// You get a neat lsit of the launches.
// Mission name in bold, as well as the rocket:
async function getLaunches(){
const res = await axios.get('https://api.spacexdata.com/v3/launches/upcoming');
const ul = document.querySelector("#launches");
for(let launch of res.data){
const newLi = document.createElement('li');
const mission = document.createElement('B');
mission.innerText = launch.mission_name;
newLi.append(mission);
newLi.innerHTML += `- ${launch.rocket.rocket_name}`;
ul.append(newLi)
}
}
// So there is a button to show the launches:
async function getLaunches(){
const res = await axios.get('https://api.spacexdata.com/v3/launches/upcoming');
renderLaunches(res.data);
}
function renderLaunches(launches){
const ul = document.querySelector("#launches");
for(let launch of launches){
ul.append(makeLaunchLi(launch))
}
}
function makeLaunchLi(launch){
const newLi = document.createElement('li');
const mission = document.createElement('B');
mission.innerText = launch.mission_name;
newLi.append(mission);
newLi.innerHTML += `- ${launch.rocket.rocket_name}`;
return newLi;
}
const btn = document.querySelector('#getLaunches')
btn.addEventListener('click', getLaunches);
// Error handling:
// Everytime you call this function, you get a random dog image:
async function getRandomDog() {
const res = await axios.get('https://dog.ceo/api/breeds/image/random')
const img = document.querySelector("#dog")
img.src = res.data.message;
}
async function getDogByBreed(breed){ // Calling this function calls a specific breed.
const url = `https://dog.ceo/api/breed/${breed}/images/random`;
const res = await axios.get(url)
const img = document.querySelector("#dog")
img.src = res.data.message;
}
// HTML:
// <form action="" id="searchform">
// <input type="text" id="search">
// <button>Search</button>
// </form>
// <img src="" alt="" id="dog">
// If you call getDogByBreed('lab'), it won't work. You'll get an error because you hae to be specific.
// How do we handle errors? Try and catch.
async function getDogByBreed(breed){
try {
const url = `https://dog.ceo/api/breed/${breed}/images/random`;
const res = await axios.get(url)
const img = document.querySelector("#dog")
img.src = res.data.message;
} catch(e){
alert("BREED NOT FOUND!")
getRandomDog(); // This will still run even after there is an error.
}
}
const form = document.querySelector('#searchform')
const input = document.querySelector('#search')
form.addEventListener("submit", function(e){
e.preventDefault();
getDogByBreed(input.value);
input.value = ""; // Automatically makes the input blank.
})
// Axios get params
// .get
// axios.get(url, [config])
// config is an optional object many Axios methods use. It holds a specific configuration for what you needs.
// .get with Query Params
// To make request for /resource?a=1&b=2, can either use:
// axios.get("/resource?a=1&b=2s")
// or
// axios.get("/resource", {params: {a: 1, b: 2}})
async function getJoke(first, last){
let res = await axios.get(`http://api.icndb.com/jokes/random?firstName=${first}&lastName=${last}`)
console.log(res.data.value.joke)
}
getJoke("Butters", "Steele")
// The other way:
async function getJoke(firstName, lastName){
let res = await axios.get(`http://api.icndb.com/jokes/random`, {params: {firstName, lastName}})
console.log(res.data.value.joke)
}
getJoke("Butters", "Steele")
// Axios Post
// .post
// Similar to axios.post(url, [data,] [config])
async function getUsers(){
const res = await axios.get('https://regres.in/api/users');
console.log(res);
}
async function createUser(){
const res = await axios.post('https://regres.in/api/users', {username:
"Butters The Chicken", email:"butters@gmail.com", age: 1});
console.log(res)
}
createUser();
// Hacker snooze axios
// You don't have the right credentials, comes with an error message:
// Before, you didn't have a token, but now you do.
async function getUsers(token) {
const res = await axios.get('https://hack-or-snooze-v3.herokuapp.com/users', {params:
{token}});
console.log(res);
}
getUsers();
// On the website, you need to send a post request a url/signup.
async function signUp(username, password, name){
const res = await axios.post('https://hack-or-snooze-v3.herokuapp.com/signup', {user: { name,
username, password}})
console.log(res);
}
// signUp('butterschicken', "12324134kdnfvjnx", 'butters the chicken')
async function login(username, password){
const res = await axios.post('https://hack-or-snooze-v3.herokuapp.com/login', {user: { name,
username, password}})
console.log(res);
return res.data.token;
}
login('butterschicken', "12324134kdnfvjnx")
async function getUsersWithAuth(){
const token = await login('butterschicken', '12324134kdnfvjnx')
getUsers(token);
}
async function createStory(){
const token = await login('butterschicken', '12324134kdnfvjnx')
const newStory = {
token,
story: {
author: 'Butters',
title: 'BOCK BOCK BOCK',
url: 'http://chickens4lyfe.com'
}
}
const res = await axios.post('https://hack-or-snooze-v3.herokuapp.com/stories', newStory)
console.log(res);
}
createStory()