I'm creating a page only with JavaScript without using Jquery but I want to insert the buttons on the page depending on the number of elements and the number of elements per page, the innerHTML of line 34 does not insert the buttons on the page if I check the value of divButtons per console is correct but does not appear on the page.
// Global Variables
var itemsPerPage = 10;
var list = document.getElementsByClassName('student-list');
var items = document.getElementsByClassName('student-item');
var actualPage = 1;
var divButtons = document.getElementsByClassName("pagination");
var index;
var message;
// Count the numbrer of items in the list
var getNumberOfItems = function () {
var numbrerOfItems = items.length;
return (numbrerOfItems);
}
// Generating rhe number of pages
var getNumberOfPages = function () {
var numberOfPages = parseInt(getNumberOfItems() / itemsPerPage);
if ( getNumberOfItems() % itemsPerPage > 0 ){
numberOfPages += 1;
}
return numberOfPages;
}
// add the navigations buttons
var addButtons = function (activePage) {
message = "<ul>";
for (var i = 0; i < getNumberOfPages(); i++) {
message += "<li><a ";
if(activePage === (i +1)){
message += "class = 'active' ";
}
message += "href='#' onclick = 'changePage(" + (i + 1) + ")'>" + ( i +1 ) + "</a></li>";
}
message += "</ul>";
divButtons.innerHTML(message);
}
var hideItems = function () {
for (var i = 0; i < getNumberOfItems(); i++) {
items[i].style.display = "none";
}
}
function showItemsByPage (page) {
for (var i = 0; i <= itemsPerPage - 1; i++) {
index = page * itemsPerPage - itemsPerPage + i;
items[index].style.display = "block";
}
}
function changePage (number) {
document.addEventListener( "DOMContentLoaded", hideItems());
document.addEventListener( "DOMContentLoaded", showItemsByPage(number));
document.addEventListener( "DOMContentLoaded", addButtons(number));
}
changePage(1);body{
background-color: #e1f1f6;
font-family: Helvetica, sans-serif;
color: #222;
}
.page{
margin: 50px auto;
width: 70%;
background-color: #fff;
border-radius: 5px;
padding: 50px;
}
.page-header{
margin-bottom: 20px;
}
.page-header h2{
float: left;
font-size: 22px;
text-transform: uppercase;
font-weight: bold;
color: #555;
}
.page-header .student-search{
float: right;
}
.page-header .student-search input{
border-radius: 5px;
border: 1px solid #eaeaea;
padding: 8px 15px;
font-size: 14px;
}
.page-header .student-search button{
border-radius: 5px;
border: 1px solid #eaeaea;
padding: 8px 15px;
font-size: 14px;
background-color: #4ba6c3;
color: #fff
}
.student-list{}
.student-item{
margin: 0 0 20px 0;
padding: 0 0 20px 0;
border-bottom: 1px solid #eaeaea;
}
.student-details{
width: 50%;
float: left;
}
.student-details .avatar{
width: 40px;
height: auto;
border-radius: 20px;
float: left;
margin-right: 14px
}
.student-details h3{
margin: 4px 0 2px 0;
font-weight: bold;
color: #4ba6c3;
}
.student-details .email{
color: #888;
font-size: 14px;
}
.joined-details{
width: 50%;
float: left;
text-align: right;
}
.joined-details .date{
margin-top: 15px;
display: block;
font-size: 14px;
color: #999;
}
.student-item:last-child{
margin: 0;
padding: 0;
border-bottom: none;
}
.pagination{
margin: 40px 0 0 0;
text-align: center;
}
.pagination li{
display: inline;
}
.pagination li a{
border: 1px solid #eaeaea;
border-radius: 5px;
padding: 3px 8px;
text-decoration: none;
color: #4ba6c3;
}
.pagination li a.active,
.pagination li a:hover{
background-color: #4ba6c3;
color: #fff;
}
.hidenItems{
display: none;
}
.showItems{
display: block;
}<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>Students</title>
<link rel="stylesheet" href="css/reset.css">
<link rel="stylesheet" href="css/design.css">
</head>
<body>
<div class="page">
<div class="page-header cf">
<h2>Students</h2>
</div>
<ul class="student-list">
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/67.jpg">
<h3>iboya vat</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/15/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/75.jpg">
<h3>aapo niskanen</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/15/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/34.jpg">
<h3>phillip cox</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/11/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/38.jpg">
<h3>zilda moreira</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/15/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/23.jpg">
<h3>lilou le gall</h3>
<span class="email">lilou.le [email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/16/13</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/94.jpg">
<h3>lucy hall</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/11/16</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/24.jpg">
<h3>mark colin</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 01/14/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/14.jpg">
<h3>sara alves</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/19/16</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/49.jpg">
<h3>ramon macrae</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/13/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/15.jpg">
<h3>connor taylor</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/18/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/11.jpg">
<h3>aymeric morel</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/13/13</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/49.jpg">
<h3>lorenz otto</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/11/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/29.jpg">
<h3>karl williamson</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 01/12/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/34.jpg">
<h3>ouassim heering</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 01/18/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/91.jpg">
<h3>roberto molina</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/13/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/28.jpg">
<h3>jordan hubert</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/13/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/29.jpg">
<h3>melvin baker</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/18/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/26.jpg">
<h3>everett gordon</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/17/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/82.jpg">
<h3>aiden ma</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/18/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/62.jpg">
<h3>florent gerard</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 02/12/13</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/96.jpg">
<h3>amber chen</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/12/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/9.jpg">
<h3>alexandra davies</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/11/13</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/57.jpg">
<h3>sergio cole</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 02/17/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/98.jpg">
<h3>edgar dixon</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/17/11</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/94.jpg">
<h3>kirk myers</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/17/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/28.jpg">
<h3>ani hesseling</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 08/14/16</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/24.jpg">
<h3>victoire bonnet</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/13/16</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/44.jpg">
<h3>marcos morales</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 01/12/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/75.jpg">
<h3>nils neumann</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 03/11/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/86.jpg">
<h3>emily harrison</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/18/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/41.jpg">
<h3>matthew fortin</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 03/18/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/32.jpg">
<h3>charlotte steward</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 02/18/11</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/3.jpg">
<h3>marceau rodriguez</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/13/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/91.jpg">
<h3>hudson anderson</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/12/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/33.jpg">
<h3>warren phillips</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 01/11/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/41.jpg">
<h3>leo niva</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/14/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/3.jpg">
<h3>hani prevoo</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 01/11/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/79.jpg">
<h3>veronica rodriguez</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/17/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/41.jpg">
<h3>ginestal das neves</h3>
<span class="email">ginestal.das [email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/19/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/63.jpg">
<h3>devon barnes</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/19/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/55.jpg">
<h3>brennan pierce</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/15/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/35.jpg">
<h3>zachary singh</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/19/11</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/35.jpg">
<h3>arlo harris</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 07/12/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/60.jpg">
<h3>hannah ginnish</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 05/17/14</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/95.jpg">
<h3>goos brunt</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 09/15/12</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/91.jpg">
<h3>eduard riedel</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/12/15</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/42.jpg">
<h3>geesken jekel</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 02/12/13</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/women/54.jpg">
<h3>dolores ryan</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 06/17/16</span>
</div>
</li>
<li class="student-item cf">
<div class="student-details">
<img class="avatar" src="https://randomuser.me/api/portraits/thumb/men/49.jpg">
<h3>steven rogers</h3>
<span class="email">[email protected]</span>
</div>
<div class="joined-details">
<span class="date">Joined 01/18/11</span>
</div>
</li>
</ul>
<div class="pagination">
</div>
</div>
<script type="text/javascript" src= "js/scripts.js">
</script>
</body>
</html>