We Keep Coding

How to make this JavaScript function with two nested functions return the correct string [duplicate]

This question already has answers here:
How do I return the response from an asynchronous call?
(41 answers)
Closed 2 years ago.
I'm trying to implement JavaScript tool for generating a random video from specific channel from youtube, I coded everything and it works fine in the console, however I cannot save the value in variable and to display the video later on my website. Is it possible to make the value of x (defined on the end of the pasted code) have the value of youtubeUrl
function getVideo() {
var channelId = "";
var apiKey = "";
var videosUrl = "https://www.googleapis.com/youtube/v3/search?order=date&part=snippet&channelId=" + channelId + "&maxResults=50&key=" + apiKey;
var ajax = new XMLHttpRequest();
ajax.open("GET", videosUrl, true);
ajax.send();
ajax.onreadystatechange = function() {
if(this.readyState == 4 && this.status == 200) {
var json = JSON.parse(this.responseText);
var videos = json.items;
var randomNumber = Math.floor(Math.random() * (videos.length + 1));
var randomVideo = videos[randomNumber];
var videoId = randomVideo.id.videoId;
var videoUrl = "https://www.googleapis.com/youtube/v3/videos?id=" + videoId + "&part=snippet,contentDetails,statistics&key=" + apiKey;
var ajax = new XMLHttpRequest();
ajax.open("GET", videoUrl, true);
ajax.send();
ajax.onreadystatechange = function() {
if(this.readyState == 4 && this.status == 200) {
var json = JSON.parse(this.responseText);
var singleVideo = json.items[0].id;
var youtubeUrl = "https://www.youtube.com/embed/" + singleVideo;
}
};
}
};
}
let x = getVideo(); // how to make it such that x has the value of youtubeUrl

Just wrap the content of your function inside a new Promise constructor and resolve it with the youtubeUrl:
function getVideo() {
return new Promise((resolve, reject) => {
var channelId = "";
var apiKey = "";
var videosUrl = "https://www.googleapis.com/youtube/v3/search?order=date&part=snippet&channelId=" + channelId + "&maxResults=50&key=" + apiKey;
var ajax = new XMLHttpRequest();
ajax.open("GET", videosUrl, true);
ajax.send();
ajax.onreadystatechange = function() {
if(this.readyState == 4 && this.status == 200) {
var json = JSON.parse(this.responseText);
var videos = json.items;
var randomNumber = Math.floor(Math.random() * (videos.length + 1));
var randomVideo = videos[randomNumber];
var videoId = randomVideo.id.videoId;
var videoUrl = "https://www.googleapis.com/youtube/v3/videos?id=" + videoId + "&part=snippet,contentDetails,statistics&key=" + apiKey;
var ajax = new XMLHttpRequest();
ajax.open("GET", videoUrl, true);
ajax.send();
ajax.onreadystatechange = function() {
if(this.readyState == 4 && this.status == 200) {
var json = JSON.parse(this.responseText);
var singleVideo = json.items[0].id;
var youtubeUrl = "https://www.youtube.com/embed/" + singleVideo;
resolve(youtubeUrl);
}
};
}
};
}
let x = await getVideo();

i trying to call this API address but didn't display

var xbtc = new XMLHttpRequest();
xbtc.open('GET', 'https://bittrex.com/api/v1.1/public/getmarketsummary?market=btc-xem', true);
xbtc.onreadystatechange = function(){
if(xbtc.readyState == 4){
var ticker = JSON.parse(xbtc.responseText);
pc = market.Last;
console.log(pc);
}
};

javascript .send() not working on mobile

this javascript is working on desktop but not on mobile browsers. Is there an edit which could resolve this?
The script send the results to a questionnaire to a google document to pull out the results. It works ok on a desktop browser but no luck on mobiles.
<script>
var myForm = document.getElementById("questionnaire");
if (myForm) {
myForm.onsubmit = function(evt) {
evt.preventDefault();
var questionDiv = document.getElementById('question-div');
var busyDiv = document.getElementById('busy');
var resultDiv = document.getElementById('result-div');
var resultList = document.getElementById('result-list');
var xhr = new XMLHttpRequest();
var url = "https://script.google.com/macros/s/AKfycbzGx6a6eogfVTaKD_3a4kiLBZfcdD5GMoonNsSSY1-sCCJfPDI/exec";
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.onload = function() {
if(xhr.readyState == 4 && xhr.status == 200) {
var response = JSON.parse(xhr.responseText);
var result = response.result;
for (var i in result) {
var e = result[i];
if (e) {
var li = document.createElement('li');
if (e.url) {
var a = document.createElement('a');
a.href = e.url;
a.textContent = e.name;
li.appendChild(a);
} else {
li.textContent = e.name;
}
resultList.appendChild(li);
}
}
busyDiv.hidden = true;
resultDiv.hidden = false;
}
}
var form = document.getElementById('questionnaire');
var formData = new FormData(form);
var fields = ['name','email','yob','gender','income','asset','q1','q2','q3','q4','q5','q6','q7','q8','q9','q10'];
var params = [];
for (var i in fields) {
var field = fields[i];
params.push(field + "=" + formData.get(field));
}
xhr.send(params.join('&'));
questionDiv.hidden=true;
busyDiv.hidden=false;
return false;
};
}
</script>

jQuery AppendChild With Images

I am trying to append an image into a span, it works perfectly outputting the image path as text using:
homeTeamName_span.appendChild(homeTeamName_crest);
However, when trying to wrap image tags around it, it doesn't do anything and no data will load because of it.
What would be the reason for this?
homeTeamName_span.appendChild("<img src='homeTeamName_crest' />");
Function source
window.onload = function() {
var xmlhttp = new XMLHttpRequest();
var url = "http://bushell.net/football/site/includes/webservice.php?service=allfixtures&limit=10&competition=427";
var url2 = "http://bushell.net/football/site/includes/webservice.php?service=allfixtures&limit=10&competition=426"
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
getECL(xmlhttp.responseText);
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
function getECL(response) {
var ECL_arr = JSON.parse(response);
var i;
//add 6hrs
var ecl_games = document.getElementById("ecl-games");
for(i = 0; i < ECL_arr.length; i++) {
var gameInfo_container = document.createElement("LI");
ecl_games.appendChild(gameInfo_container);
var homeTeamName_span = document.createElement("SPAN");
homeTeamName_span.className = "text-right";
var homeTeamName_text = document.createTextNode(ECL_arr[i].homeTeamName);
homeTeamName_span.appendChild(homeTeamName_text);
gameInfo_container.appendChild(homeTeamName_span);
var date_span = document.createElement("SPAN");
date_span.className = "d-g";
var date_span_text = document.createTextNode(ECL_arr[i].date);
date_span.appendChild(date_span_text);
gameInfo_container.appendChild(date_span);
var awayTeamName_span = document.createElement("SPAN");
awayTeamName_span.className = "text-left";
var awayTeamName_text = document.createTextNode(ECL_arr[i].awayTeamName);
awayTeamName_span.appendChild(awayTeamName_text);
gameInfo_container.appendChild(awayTeamName_span);
}
xmlhttp.onreadystatechange=function() {
if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
getPrem(xmlhttp.responseText);
}
}
xmlhttp.open("GET", url2, true);
xmlhttp.send();
function getPrem(response){
var prem_arr = JSON.parse(response);
var prem_games = document.getElementById("prem-games");
for(var j = 0; j<prem_arr.length; j++) {
var gameInfo_container = document.createElement("LI");
prem_games.appendChild(gameInfo_container);
var homeTeamName_span = document.createElement("SPAN");
homeTeamName_span.className = "text-right";
var homeTeamName_text = document.createTextNode(prem_arr[j].homeTeamName);
var homeTeamName_crest = document.createTextNode(prem_arr[j].homeTeamCrest);
homeTeamName_span.appendChild("<img src='homeTeamName_crest' />");
homeTeamName_span.appendChild(homeTeamName_text);
gameInfo_container.appendChild(homeTeamName_span);
var date_span = document.createElement("SPAN");
date_span.className = "d-g";
var date_span_text = document.createTextNode(prem_arr[j].date);
date_span.appendChild(date_span_text);
gameInfo_container.appendChild(date_span);
var awayTeamName_span = document.createElement("SPAN");
awayTeamName_span.className = "text-left";
var awayTeamName_text = document.createTextNode(prem_arr[j].awayTeamName);
awayTeamName_span.appendChild(awayTeamName_text);
gameInfo_container.appendChild(awayTeamName_span);
}
console.log("loop finished");
}
}

this shoud work , if homeTeamName_crest is the path of the picture
$(homeTeamName_span).append("<img src='"+homeTeamName_crest+"' />")

What if you do this?
var homeTeamName_crest = prem_arr[j].homeTeamCrest; // <--- change this line, don't make it a textNode
homeTeamName_span.appendChild("<img src='" + homeTeamName_crest + '/>"); // <--- change this line, we want to interpolate the string as the path to the image

JS search returned xhr.responseText for div then remove div

I would like to search a xhr.responseText for a div with an id like "something" and then remove all the content from the xhr.responseText contained within that div.
Here is my xhr code:
function getSource(source) {
var url = source[0];
var date = source[1];
/****DEALS WITH CORS****/
var cors_api_host = 'cors-anywhere.herokuapp.com';
var cors_api_url = 'https://' + cors_api_host + '/';
var slice = [].slice;
var origin = self.location.protocol + '//' + self.location.host;
var open = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function () {
var args = slice.call(arguments);
var targetOrigin = /^https?:\/\/([^\/]+)/i.exec(args[1]);
if (targetOrigin && targetOrigin[0].toLowerCase() !== origin &&
targetOrigin[1] !== cors_api_host) {
args[1] = cors_api_url + args[1];
}
return open.apply(this, args);
};
/****END DEALS WITH CORS****/
var xhr = new XMLHttpRequest();
xhr.open("GET", cors_api_url+url, true);
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
var resp = xhr.responseText;
var respWithoutDiv = removeErroneousData(resp);
}
else{
return "Failed to remove data.";
}
}
xhr.send();
}
remove div here:
/*This must be in JS not JQUERY, its in a web worker*/
function removeErroneousData(resp) {
var removedDivResp = "";
/*pseudo code for removing div*/
if (resp.contains(div with id disclosures){
removedDivResp = resp.removeData(div, 'disclosures');
}
return removedDivResp;
}

You can dump the response in a div and then search for that div you want empty its content.
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
var resp = xhr.responseText;
$('div').attr('id', 'resp').html(resp);
$('#resp').find('disclosures').html('');
//var respWithoutDiv = removeErroneousData(resp);
}
else{
return "Failed to remove data.";
}
}