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How do you write a function that has a class name and returns a array of strings in javascript?

Write a function that takes one or more class names as a parameter and returns an array of strings, where each string is the inner text content of an anchor tag in the current document that have any of the given classes

Maybe this one:
<a class="one" href="#">Link 1</a>
<a class="two" href="#">Link 2</a>
<a class="one" href="#">Link 3</a>
<a class="one" href="#">Link 4</a>
<a class="two" href="#">Link 5</a>
<a class="two" href="#">Link 6</a>
<a class="one" href="#">Link 7</a>
<button id="btn">Click me</button>
and JS
var button = document.getElementById('btn');
var className = "one";
button.addEventListener('click', function() {
find(className);
});
function find(str) {
var items = document.getElementsByClassName(str);
for(var i=0; i<items.length; i++) {
console.log(items[i].innerHTML);
}
}

function getTextsFromLinks(...classes) {
let resultArr = [];
for(let class of classes) {
for(let link of document.querySelectorAll(`.${class}`)) {
resultArr.push(link.innerText);
}
}
return resultArr;
}
Maybe this will work.

Get href attribute on click event with Javascript and Framework7

I'm struggling with a very simple problem that I can't solve.
I'm using Framework7 (JS Framework for mobile application) and I have two list in my page:
First list:
<ul>
<li>
<a id="android" class="link external" target="_blank" href="android_link"></a>
</li>
<li>
<a id="iOS" class="link external" target="_blank" href="ios_link"></a>
</li>
<li>
<a id="windows" class="link external" target="_blank" href="windows_link"></a>
</li>
</ul>
Second list:
<ul>
<li>
<a href="fb_link" target="_blank" class="item-link item-content link external" id="facebook">
<div class="item-media">
<i class="f7-icons">logo_facebook</i>
</div>
<div class="item-inner">
<div class="item-title">Facebook</div>
</div>
</a>
</li>
<li>
<a href=instagram_link" target="_blank" class="item-link item-content link external" id="instagram">
<div class="item-media">
<i class="f7-icons">logo_instagram</i>
</div>
<div class="item-inner">
<div class="item-title">Instagram</div>
</div>
</a>
</li>
</ul>
So, I need to take the href attribute on click event. I wrote this:
Dom7('.link.external').on('click', (event) => {
// First try
href = event.target.getAttribute('href')
console.log(href)
// Second trye
console.log(event.srcElement.href)
// Third try
var href = Dom7('a.link.external').attr('href');
var id = Dom7('a.link.external').attr('id');
console.log(href)
console.log(id)
})
I've tried three different solutions, but none of them work.
The first one and second one works only for the first list, I think because the <a> tag doesn't contains html inside.
The third one always return me the href and id of the first elements of the first list (android), even if I click in the second list.
Can you help me to solve this problem?

Solution 1
<ul>
<li>
<a id="android" class="link external" target="_blank" href="android_link" onclick="linkClicked(this); return false;"></a>
</li>
</ul>
<script>
function linkClicked(object) {
consile.log(object.getAttribute("href"));
return false;
}
</script>
Solution 2
var elements = document.getElementsByClassName('link');
for (var i = 0; i < elements.length; i++) {
elements[i].addEventListener('click', linkClicked, false);
}
function linkClicked() {
console.log(this.getAttribute("href"));
};

if you can use jquery, use this working code :
$('.link.external').on('click', (event) => {
href = event.target.getAttribute('href');
alert(href);
});
jsfiddle

Displaying pictures in html

I am learning about the DOM and incorporating Javascript in html files, I have tried this code that display and hide pictures using the event listener click. however, pictures don't seem to appear even no error is detected in the Chrome console.
NOTE: I only posted the concerned code, I omitted some of the HTML tags
<style>
.hide{
display: none;
}
</style>
<main>
<ul>
<li><a data-img="face" id="facebook" href="#"> Facebook </a></li>
<li><a data-img="insta" id="instagram" href="#"> Instagarm </a></li>
<li><a data-img="snap" id="snapchat" href="#"> Snapchat </a></li>
</ul>
<img class="hide" id="face" scr="https://cdn3.iconfinder.com/data/icons/free-social-icons/67/facebook_square-128.png">
<img class="hide" id="insta" scr="http://bikecleanse.com/wp-content/uploads/2016/10/Insta-Logo.png" >
<img class="hide" id="snap" scr="https://icon-icons.com/icons2/686/PNG/512/snapchat_snap_chat_icon_logo_social_app_red_icon-icons.com_61225.png">
</main>
<script type="text/javascript">
var face = document.getElementById('facebook');
var insta = document.getElementById('instagram');
var snap = document.getElementById('snapchat');
face.addEventListener("click", show);
insta.addEventListener("click", show);
snap.addEventListener("click", show);
function show() {
var picId = this.attributes["data-img"].value;
var pic = document.getElementById(picId);
if(pic.className === "hide"){
pic.className="";
} else {
pic.className= "hide";
}
}
</script>

First off, you issues is that it is src and not scr, so change that attribute and the images will show.
Second, I would recommend using classList with add, remove and contains. You could also use toggle to make your code even smaller like so:
<style>
.hide {
display: none;
}
</style>
<main>
<ul>
<li> <a data-img="face" id="facebook" href="#"> Facebook </a> </li>
<li> <a data-img="insta" id="instagram" href="#"> Instagarm </a> </li>
<li> <a data-img="snap" id="snapchat" href="#"> Snapchat </a> </li>
</ul>
<img class="hide" id="face" src="https://cdn3.iconfinder.com/data/icons/free-social-icons/67/facebook_square-128.png">
<img class="hide" id="insta" src="http://bikecleanse.com/wp-content/uploads/2016/10/Insta-Logo.png">
<img class="hide" id="snap" src="https://icon-icons.com/icons2/686/PNG/512/snapchat_snap_chat_icon_logo_social_app_red_icon-icons.com_61225.png">
</main>
<script type="text/javascript">
var face = document.getElementById('facebook');
var insta = document.getElementById('instagram');
var snap = document.getElementById('snapchat');
face.addEventListener("click", show);
insta.addEventListener("click", show);
snap.addEventListener("click", show);
function show() {
var picId = this.attributes["data-img"].value;
var pic = document.getElementById(picId);
pic.classList.toggle('hide', !pic.classList.contains('hide'))
}
</script>

I added the event input to your show function. I modified your show function like below. Check if this works for you:
function show(e) {
let picId = e.target.dataset.img;
let pic = document.getElementById(picId);
if(pic.classList.contains('hide'){
pic.classList.remove('hide');
}
else{
pic.classList.add('hide');
}
}

a href link clicked and div displays image

I would like a javascript method to display image in div depending on which a href link is clicked.
I have written some code but it needs developing further.
<script type=" ">
function changeImg(){
var image1 = new Image();
image1.src='car.png'
var imghol = document.getElementById("imageHolder");
var elements = document.getElementById("FS");
if(elements.onclick = function()){
imghol = image1;
}
</script>
<div class="ADS2"><h2>Vehicle Part</h2><p>Please select a part you wish to find;
<div class="vertical_menu">
<ul>
<li><a id="FS" href="#home" onclick="changeImg">Front Side</a></li>
<li><a id="RS" href="#news">Rear Side</a></li>
<li><a id="S" href="#contact">Side</a></li>
<li><a id="US"href="#about">Under Side</a></li>
<li><a id="I" href="#about">Interior</a></li>
</ul>
</div>
<div class="imageholder">
</div>
</div>

Keep it simple. Try this:
<script type="text/javascript">
function changeImg(image){
var imghol = document.getElementById("imageHolder");
imghol.src = image;
}
</script>
<div class="ADS2">
<h2>Vehicle Part</h2>
<p>Please select a part you wish to find;</p>
<div class="vertical_menu">
<ul>
<li><a id="FS" href="javascript:" onclick="changeImg('car.jpg');">Front Side</a></li>
<li><a id="RS" href="javascript:" onclick="changeImg('rear.png')">Rear Side</a></li>
<li><a id="S" href="javascript:" onclick="changeImg('caside.png')">Side</a></li>
<li><a id="US" href="javascript:" onclick="changeImg('under.png')">Under Side</a></li>
<li><a id="I" href="javascript:" onclick="changeImg('interior.png')">Interior</a></li>
</ul>
</div>
<div class="imageholder"><img id="imageHolder" /></div>
</div>

use this
HTML
<a onclick="changeImg('pic1.png')">Link 1</a>
<a onclick="changeImg('pic2.png')">Link 2</a>
<a onclick="changeImg('pic3.png')">Link 3</a>
<a onclick="changeImg('pic4.png')">Link 4</a>
.....
<div class="imageholder">
<img id="change_img_target" />
</div>
Javascript
function changeImg(url) {
document.getElementById("change_img_target").src = url;
}

You can also achieve this with jQuery. Be sure to include the jQuery library in your file. :)
HTML:
Link 1
Link 2
<div id="div">
</div>
jQuery (add this to the bottom of your page):
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(document).ready(function() {
function changeImg(url) {
var image = "<img src='url' />";
$("#div").html(image);
}
});
</script>

# Naveen,
You can achieve the solution using any of the following 2 answers.
Ans1:
<script type="text/javascript">
function preloader()
{
var imgs = ['chart1.jpg','chart2.jpg','chart3.jpg','chart4.jpg','chart5.jpg']; // take array of images
var container = document.getElementById('photos');
var docFrag = document.createDocumentFragment();
imgs.forEach(function(url, index, originalArray) {
var img = document.createElement('img');
img.src = url;
docFragenter code here.appendChild(img);
});
container.appendChild(docFrag);
}
</script>
<body onload="preloader();">
<div>
<table width="100%" style="height: 100%;" border="0">
<tr>
<td>
<p id="photos" onclick="preloader()" />
</td>
</tr>
</table>`
</div>
Ans2:
function preloader()
{
var imgs=['chart1.jpg','chart2.jpg','chart3.jpg','chart4.jpg','chart5.jpg'];
var container = document.getElementById('photos');
for (var i = 0, j = imgs.length; i < j; i++) {
var img = document.createElement('img');
img.src = imgs[i]; // img[i] refers to the current URL.
container.appendChild(img);
}
}
Link for more Help:
How to add a list of images to the document from an array of URLs?

Clicking on a list element to get an alert

Lets say I have a list of links:
<a id="home" href="#"> home link </a><br/>
<a id="list1" href="#"> some text1 </a><br/>
<a id="list2" href="#"> some text2 </a><br/>
<a id="list3"> href="#"> some text3 </a><br/>
<a id="list4" href="#"> some text4 </a><br/
<a id="list5" href="#"> some text5 </a><br/>
<a id="list sails" href="#"> sails link </a><br/>
and if some list link is clicked I get an alert with its text.
I wrote a script but it isn't right, it looks like this:
function lunch(){
alert( $(this).text()) }
for
<a id="listn" href="#" onclick="lunch()"> some text5 </a><br/>
How to do this in jQuery or just JavaScript?

$('a[id^=list]').click(function () {
alert($(this).text());
});
This will work for all links that has an id starting with 'list'. if you want it to work for all links change the selector to $('a').

You should pass the node instance into the lunch function.
< a id="listn" href="#" onclick="lunch(this)"> some text5 < /a>
And use this as argument
function lunch(node){ alert( $(node).text()) }

Do this:
<div id="links">
<a id="home" href="#">home link</a>
<a id="list1" class="list" href="#">some text1</a>
<a id="list2" class="list" href="#">some text2</a>
<a id="list3" class="list" href="#">some text3</a>
<a id="list4" class="list" href="#">some text4</a>
<a id="list5" class="list" href="#">some text5</a>
</div>
with:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
$("#links a").click(function() {
alert(this.id);
return false;
});
});
</script>
or to restrict it to just the list ilinks:
$("a.list").click(function() {
alert(this.id);
return false;
});
You'll note that I put a class in there instead of using an attribute selector, which generally isn't advised. Also, by the principles of Unobtrusive JavaScript you should add your event handlers this way rather than using onclick attributes.

The best thing to do would be to give each one a class, e.g `
$(function()
{
$('.lunchable').click(function()
{
alert($(this).text());
});
});