Passing JavaScript object to another function - javascript

I'm using an API that allows me to access JSON objects which I've used and convert in to a JavaScript object. I get a console log of film names so this works.
Now I'm I was wondering is it possible to reference this film object in other functions? or do I need to do a request in every function to access the film properties?
$("#search-button").click(function(){
search();
});
function search() {
var userInput = $("#content-container-search").val().replace(/\s+/g,"%20");
var searchTerm = "".concat(standardURL, apiKey, 'query=', userInput);
var request = new XMLHttpRequest();
request.open('GET', searchTerm , true);
request.onload = function(data) {
var data = JSON.parse(this.response);
if(data['results']){
data.results.forEach(film => {
if(film['title']){
console.log("film title : " + film.title);
}
});
}
}
request.send();
}

I think you need to understand the scope of each variable... if you do so, you can create a variable with greater scope, for example if you create a var data; outside the search function, and when you receive the data you do: data=JSON.parse(this.response); you will have access to data variable from outside the function
something like this:
$("#search-button").click(function(){
search();
});
var data;
function search() {
var userInput = $("#content-container-search").val().replace(/\s+/g,"%20");
var searchTerm = "".concat(standardURL, apiKey, 'query=', userInput);
var request = new XMLHttpRequest();
request.open('GET', searchTerm , true);
request.onload = function(data) {
data = JSON.parse(this.response);
data.results.forEach(film => {
console.log(film.title);
});
}
request.send();
}

There are two ways you can do as follow:
$("#search-button").click(function(){
search();
});
var firmList; // global variable
function search() {
var userInput = $("#content-container-search").val().replace(/\s+/g,"%20");
var searchTerm = "".concat(standardURL, apiKey, 'query=', userInput);
var request = new XMLHttpRequest();
request.open('GET', searchTerm , true);
request.onload = function(data) {
var data = JSON.parse(this.response);
firmList = data; // set data to global variable.
data.results.forEach(film => {
console.log(film.title);
});
}
request.send();
}
function test(){ // test external function
console.log(firmList); // will log the object
}
/*******************OR *****************/
request.onload = function(data) {
var data = JSON.parse(this.response);
test(data); // pass the object to another function.
data.results.forEach(film => {
console.log(film.title);
});
}
function test(_object){ // test function.
console.log(_object); // will log the parsed response object here.
}

Related

How do I make multiple API calls via XMLHttpRequest?

I'm not that experienced when it comes to APIs so excuse me in advance.
I'm trying to get a button to display the contents (response) of an API, and the code below works wonders. I'm wondering how I would make the exact same request, but instead of the "explicit" endpoint, I want a "history" endpoint instead.
How would I do this?
const data = null;
const xhr = new XMLHttpRequest();
xhr.withCredentials = true;
var object1;
xhr.addEventListener("readystatechange", function () {
if (this.readyState === this.DONE) {
object1 = JSON.parse(this.responseText);
}
document.getElementById('thejoke').innerHTML = object1.value;
});
xhr.open("GET", "https://api.chucknorris.io/jokes/random?category=explicit");
xhr.send(data);
The simplest answer would be to make it a function:
function send(category) {
const url = "https://api.chucknorris.io/jokes/random?category=" + category
const data = null;
const xhr = new XMLHttpRequest();
xhr.withCredentials = true;
var object1;
xhr.addEventListener("readystatechange", function () {
if (this.readyState === this.DONE) {
object1 = JSON.parse(this.responseText);
}
document.getElementById('thejoke').innerHTML = object1.value;
});
xhr.open("GET", "");
xhr.send(data);
}
And then you can you call it like this:
send("explicit");
The only problem you then face is that object1 is not available outside of the function. You could work around this by making object1 a global variable, or do the things you want to directly in the EventListener.

How can I get the value from the json I get through XMLHttpRequest?

How can I get the url, title and img from the json I get through XMLHttpRequest?
const base_url = "https://api.jikan.moe/v3"
function random(){
return Math.floor(Math.random() * 99999);
}
function sendRequest(meyhod,base_url){
return new Promise((resolve, reject) => {
var request = new XMLHttpRequest();
var id = random();
request.open('GET', `${base_url}/anime/${id}`);
request.responseType = 'json'
request.onreadystatechange = function () {
if (this.readyState === 4) {
if(this.status !== 200){
return testjs();
}
else{
request.onload = () =>{
resolve(request.response)
}}
}
};
request.send();
})
}
function testjs(){
sendRequest('GET', base_url)
.then(data => console.log(data))
.then(animepost)
}
function animepost(data){
console.log(data.image_url)
console.log(data.title)
console.log(data.url)
}
Perhaps I messed up the queries somewhere.
The arguments you pass to your sendRequest are very weird.
function sendRequest(meyhod,base_url){
You are not using methode plus you only you use the 'GET' method and baseUrl is accessible within the function.
You should be passing the id like this
function sendRequest(id){
that you are using here
request.open('GET', `${base_url}/anime/${id}`);\
and your testjs should look somthing like this
function testjs(){
sendRequest(theIdYouWantToFetch)

Reading JSON data from a url using javascript

I want to read data from this link http://starlord.hackerearth.com/gamesext.
I went through this https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/JSON and was able to obtain data from https://mdn.github.io/learning-area/javascript/oojs/json/superheroes.json.
Trying similar approach for getting data from http://starlord.hackerearth.com/gamesext is not working for me.
This is how I tried:
var requestURL = 'http://starlord.hackerearth.com/gamesext';
var request = new XMLHttpRequest();
request.open('GET', requestURL);
request.responseType = 'json';
request.send();
request.onload = function() {
var games = request.response;
document.getElementById("para").innerHTML = "for check";//para is a paragraph id
fun1(games);
}
function fun1(jsonObj){
//getting first title
document.getElementById("para").innerHTML = jsonObj[0]["title"];
}
I would want to know is that data in JSON and how to get it?
Try using the JSON.parse() method:
function fun1(jsonObj){
//getting first title
jsonObj = JSON.parse(jsonObj);
document.getElementById("para").innerHTML = jsonObj[0]["title"];
}
This will turn valid JSON into a javascript object that can be accessed as you are trying to do below.
This works perfectly fine for me:
var requestURL = 'http://starlord.hackerearth.com/gamesext';
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
console.log(xhttp.response[0].title) # LittleBigPlanet PS Vita
}
};
xhttp.open("GET", requestURL);
xhttp.responseType = 'json';
xhttp.send();
Give it a try!
Using fetch this is pretty simply.
Below is an example.
const url = 'https://mdn.github.io/learning-area/javascript/oojs/json/superheroes.json';
async function getData() {
const json = await (await fetch(url)).json();
console.log(json);
}
getData();
just put request.send(); after all the code you provided.

Passing extra arguments to XMLHttpRequest.onload

I'm trying to comunicate with a server, using XMLHttpRequest in javascript.
How can I pass info to the onload function?
// global variable that containts server response
var reply;
var makeRequest = function(extraInfo) {
var request = new XMLHttpRequest();
request.open(...);
request.onload = handler;
};
var handler = function(data) {
reply = data.target.response;
console.log("Server Reply: " + reply);
};
How can I pass the parameter extraInfo from makeRequest to the handler function? (without using a global variable)
Just use a closure in such way:
...
var makeRequest = function(extraInfo) {
var request = new XMLHttpRequest();
request.open(...);
request.onload = function(data) {
// extraInfo is accessible here
reply = data.target.response;
console.log("Server Reply: " + reply);
};
};
I figured out that passing extra info into the request handler can be done this way: (At least is good for me)
request.open(...);
request.extraInfo = identifier;
request.onload = function() {
identifier = this.extraInfo;
};
The accepted solution didn't work for me, but this did
const params = new FormData();
params.append('selectedValue', selectedValue);
const xhr = new XMLHttpRequest();
xhr.open('post', url, true);
xhr.send(params);
xhr.extraInfo = extraInfo; // <- set your data here
xhr.onload = (e) => {
const data = JSON.parse(xhr.responseText);
alert(xhr.extraInfo) /// <- access it like this
alert(e.target.extraInfo) // <- or like this
//return data;
};

How do I pass a variable to into HttpRequest?

I want to give the request.onload function a variable, and add the request.response into that variable. How do I do that?
function loadathing(url, target){
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.onload = function() {
target = request.response;
};
}
This doesn't work because it forgets what target is.
You have two problems here. First, in order to pass the response to target, you would need to do it on a property of target rather than target directly since target can't be a native value (native values such as strings and numbers cannot be passed by reference).
function loadathing(url, target){
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.onload = function() {
target.response = request.response;
};
}
var target = {};
loadathing('foo.php', target);
Secondly, since you are performing an asynchronous ajax request, you will need to add a callback to your function so that the outer code knows when target.response is populated.
function loadathing(url, target, cb){
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.onload = function() {
target.response = request.response;
cb();
};
}
var target = {};
loadathing('foo.php', target, function () {
console.log(target.response);
});
You can then simplify it by removing target all together and using the callback.
function loadathing(url, cb){
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.onload = function() {
cb(request.response);
};
}
loadathing('foo.php', function (response) {
console.log(response);
});

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