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script.js
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script.js
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"use strict";
let isTyping = false;
let arr = []; // stores img URLs
let placeholdersOnPage = 0;
let currentPage = 1;
let insertionNode = document.getElementById("cardInsertion");
let searchBar = document.getElementById('searchBar');
let searchLoader = document.getElementById('searchLoader');
let endDetector = document.getElementById('endDetector');
/*
* Initializing
*/
loadPlaceholders(40);
getTagMedia(searchBar.value);
/*
* Event Listeners
*/
searchBar.onkeydown = function(e) {
if (isTyping) return;
isTyping = true;
searchLoader.classList.add("loading");
}
searchBar.onkeyup = debounce(function() {
searchLoader.classList.remove("loading");
isTyping = false;
searchBarGo();
}, 1000);
window.onresize = throttle(function() {
console.log("resized!!!")
}, 2000);
let ObserverCallback = (entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
loadPlaceholders(30);
if ((arr.length - placeholdersOnPage) >= 30) {
shiftPlaceholders();
} else {
currentPage += 1;
getTagMedia(searchBar.value, currentPage);
}
}
})
}
let observer = new IntersectionObserver(ObserverCallback);
observer.observe(endDetector);
/*
* Function Limiters
*/
function debounce(callback, wait) {
var timeout;
return () => {
clearTimeout(timeout);
timeout = setTimeout(() => callback(...arguments), wait);
};
};
function throttle(callback, interval) {
var isRunning
return () => {
if (!isRunning) {
isRunning = true;
callback(...arguments);
setTimeout(()=> {isRunning = false}, interval);
}
}
}
/*
* Ping Instagram with current value of the searchbar (also cleans the value to have no hashtags/whitespace before querying)
*/
function searchBarGo(){
endDetector.classList.add("no-display");
let cleanedValue = searchBar.value.replace(/\s|#/g, '');
if (cleanedValue.length > 0) {
insertionNode.innerHTML = ""; // clear
window.scrollTo(0,0);
currentPage = 1;
arr = [];
loadPlaceholders(40);
getTagMedia(cleanedValue);
}
}
/*
* Inserts however many placeholders you want
*/
function loadPlaceholders(amount){
let placeholderTemplate = document.importNode(document.getElementById('phCard').content, true);
for (let i = 0; i < amount; i++) {
insertionNode.appendChild(placeholderTemplate.cloneNode(true));
}
placeholdersOnPage += amount;
}
/*
* string source - desired image src
* returns an HTML element
*/
function generateCard(source) {
var guts = `
<div class="image">
<img src="${source}">
</div>
<div class="content">
dfasfda
</div>`
var card = document.createElement("div");
card.className = "ui card";
card.innerHTML = guts;
return card;
}
/* Replaces placeholder elements with final content
* string source - desired image src
* returns an HTML element
*/
function shiftPlaceholders() {
let max = placeholdersOnPage;
for (let i = 0; i < max; i++) {
let e = arr.shift();
let myImage = new Image();
myImage.onload = () => {
let toRemove = document.querySelector(".placeholder.lazy");
toRemove.parentNode.appendChild(myImage);
toRemove.remove();
toRemove = document.querySelector(".placeholder.caption");
let guts = `<p>${e.caption.substring(0, 70)}${e.caption.length > 70? "..." : ""}</p>`
toRemove.parentNode.innerHTML = guts;
placeholdersOnPage -= 1;
}
myImage.src = e.url;
}
}
/*
* string tagName, number page (optional)
* returns a Promise object
*/
function getTagMedia(tagName, page) {
let req = new XMLHttpRequest();
return new Promise((resolve, reject)=> {
if (!page) {
req.open("get", `https://www.instagram.com/explore/tags/${tagName}/?__a=1`);
} else {
req.open("get", `https://www.instagram.com/explore/tags/${tagName}/?__a=1&page=${page}`);
}
req.onload = () => resolve(req.responseText);
req.onerror = () => reject(req.statusText);
req.send();
})
.then((response) => {
let j = JSON.parse(response);
let pictures = j.graphql.hashtag.edge_hashtag_to_media.edges;
pictures.forEach((e, i) => {
try {
arr.push({url: e.node.display_url, caption: e.node.edge_media_to_caption.edges[0].node.text, shortcode: e.node.shortcode});
} catch(err) {
console.log(err + "i dont know why javascript cannot parse it but ok")
}
})
endDetector.classList.remove("no-display");
shiftPlaceholders();
}).catch((err) => {
endDetector.classList.add("no-display");
insertionNode.innerHTML = `Cannot search for "${searchBar.value}. Error: ${err}."`;
placeholdersOnPage = 0;
})
}