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Use addEventListener on a class not working

I am trying to convert my script using addEventListener with getElementById on a var for a getElementByClassName but this doesn't work. How to fix it?
See my code
Javascript:
var input = document.getElementByClassName('myClass');
_slider.noUiSlider.on('update', function( values, handle ) {
var value = values[handle];
if ( handle ) {
input.value = Math.round(value);
});
input.addEventListener('change', function(){
_slider.noUiSlider.set([null, this.value]);
}, false);
HTML:
<input type="number" class="myClass">
This script work perfectly if I find my div with an ID, but not work with a CLASS.

There is no getElementByClassName. There is getElementsByClassName that returns a collection. If there is only one, than select the first index.
var input = document.getElementsByClassName('myClass')[0];
Other option is querySelector
var input = document.querySelector('.myClass');
My guess is that you do not have just one element, but multiple, than you need to loop over the collection.
var inputs = document.getElementsByClassName('myClass');
//or
//var inputs = document.querySelectorAll('.myClass');
for( var i=0; i<inputs.length; i++){
inputs[i].addEventListener("click", function() { console.log(this); } );
}

var input = document.getElementById('id_name')
...here addEventListener will work because "id" will unique but in case of "class" there might be same values entered...So you have to select which element you want to manipulate...example ==>
var input = document.getElementsByClassName('class_name')[0] // after this addEventListener will work.
Hope this might help you :)

Selecting a table data using javascript/jquery

Hi i am new to javascript and jquery.I just like to know if there is any way of selecting a table data using this format:
$("#myTable").row[index1][index2];
where index1 is row index, index2 is column. Anything similar is fine too.

Try this : you can use .eq() in jQuery to traverse through tr and td with specified index
var td = $("#myTable").find('tr:eq('+index1+')').find('td:eq('+index2+')');
var data = $(td).text();// you can use .html() if you need html inside td

Try This:
$(function(){
$('input').click(function()
{
var t= $(this).attr('class');
var text= $('.time'+t).text();
alert(text);
});
$('td').click(function()
{
var index = this.cellIndex;
alert($('tr:first').find('td').eq(index).text());
});
});
http://jsfiddle.net/oL4pfgda/

It will iterate your table cells and print the values-
$("#myTable>tr>td").each(function () {
var cell_value = $(this).html();
alert(cell_value);
})

Each input values into each <span> or <div>

I am trying to get the value of each input and put it in the span tag below without using ID's or classes. It's easy if I use classes or Id's. But I need to be able to use it without those. I need each input values put into each span tag. I have two but it will be more in actuality.
Thanks in advance.
any help is appreciated
below is my fiddle
var input = $('input:text');
$(input).each(function(){
values = $(this).val();
});
$('b').each(function(){
$(this).html(values);
console.log(values);
});
http://jsfiddle.net/6LB76/3/

Simple enough, just juggle the index.
jQuery
$('input:text').each(function(i){//get index for each input
var tx = $(this).val();//get value for this input
$('b').eq(i).html(tx);//print value on output with same index
});
Which can easily be expanded to update irt, as you can see in this fiddle...

You need to loop through ieach input and then each output. This is assuming that you have exactly the same number of input fields and spans to show the values.
Here is the code:
var input = $('input:text');
var values = new Array();
$(input).each(function (i) {
values[i] = $(this).val();
});
$('b').each(function (i) {
$(this).html(values[i]);
console.log(values[i]);
});
Here is the Fiddle:

First, set a counter variable i to 0. The loop through each <b> element and increment i as we go through each. Populate the <b> element with the value of the input at index i.
function run() {
var inputs = $('input:text');
var i = 0;
$('b').each(function(){
$(this).html(inputs.eq(i++).val());
});
}
Here is the Fiddle
You're being somewhat vague in your question, so please clarify if this is not what you want.

How to get div text also with it's input's values

I was wondering how to obtain the text inside a given div, with also the input's values as text.
<div id="example">This is a <input type="text" value="right"/> test.</div>
If I just try to get text like this with jQuery :
$("#example").text();
The result would be This is a test. and I'd want : This is a right test.
The number of input would be unknow. As well as the order of the elements...
EDIT :
I finally resolved my own problem :
var finalText="";
$("#example").contents().filter(function() {
if(this.nodeType==3){ finalText =finalText+ this.nodeValue;}
else if(this.nodeName=="INPUT"){ finalText=finalText+this.value;}
return finalText
})
The living example
But #Jonathan Lonowski answer is more clear and simpler than mine !

Here is a quick plugin that will do this for you:
$(document).ready(function() {
$.fn.extend({
getContentText: function() {
var t = '';
this.contents().each(function(i,c) {
var method = $(c).is("input") ? "val" : "text";
t += $(c)[method]();
});
return t;
}
});
alert($("#example").getContentText());
});
Try it out here:
http://jsfiddle.net/wQpHM/

You might try cloning so you can replaceWith the inputs with their values. Then grab the text as you were:
var clone = $('#example').clone();
clone.find(':input').replaceWith(function () {
return $(this).val();
});
alert(clone.text());

You can loop though all children of the <div> and replace then with their values. Something like this:
$.fn.allText = function(){
var $this = this.clone();
$this.children().each(function(){
$(this, $this).replaceWith(this.value);
});
return $this.text();
};
alert($('#example').allText());
Demo: http://jsfiddle.net/4mGmH/

get html and strip html tags
$('#example')[0].innerHTML.replace(/(<([^>]+)>)/ig, '').replace(/(\s+)/g, ' ')

Using innerText
document.getElementbyId('example').innerText;
To get HTML tags:-
document.getElementbyId('example').innerHTML;
Refer this URL element.innerHTML

Put all element values in an array

I have the following markup:
<div class="class1"><p>line1</p><p>line 2</p></div>
With jQuery, how can I take the values of all the p tags within the div and place them in an array?

Use .map():
var arr = $('.class1 p').map(function () {
return $(this).text();
}).get();

I will assume you mean the contents of the <p> elements, not their value (which is nothing).
var text = [];
$('.class1 > p').each(function() {
text[text.length] = $(this).text();
});