Develop Reference

Loading javascript file depending on window size

I have this code:
$(window).scroll(function() {
if ($(this).scrollTop()>275)
{
$('.navbar-left').fadeIn();
}
else
{
$('.navbar-left').fadeOut();
}
});
to show my logo on my navbar when scrolled down. The problem is I want to disable this script when the window size is at 768px. I understand I could use:
if ( $(window).width() > 768) {
//Add your javascript for large screens here
}
else {
//Add your javascript for small screens here
}
However, I do not program javascript so this is very difficult for me to integrate into my existing code. Could someone kindly help?
I have attempted so I do not get MARKED DOWN.
if ( $(window).width() > 768) {
if ($(this).scrollTop()>275)
{
$('.navbar-left').fadeIn();
}
else
{
$('.navbar-left').fadeOut();
}
});
}

Here you go.
(function(){
$(window).scroll(()=>{
if(window.innerWidth <= 768){
if($(window).scrollTop() > 10){ //<- set to number you need
$('.navbar-left').fadeOut();
}
else{
$('.navbar-left').fadeIn();
}
}
});
}())
.wrapper{ height: 100px; } /* you may need this to prevent jankiness */
.navbar-left{
height: 100px;
background-color: #f00;
}
.push {
height: 1000px; /* just to test scrolling with no content */
}
<div class="wrapper">
<div class="navbar-left">navbar left</div>
</div>
<div class="push"></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>

Scroll to top button showing when not on top of the page

I would like to have a scroll to top arrow fixed in my page using angular bootstrap.
Currently I have
<div class="col-md-1">
<div class="affix">
<div>
<a th:href="#{/}" href="#" target="_self"><img id="image" src="source" alt="yoli" width="50px" /></a>
</div>
Scroll to top
</div>
</div>
<div class="col-md-6">
<div id="search-bar" ng-include="blabla"></div>
<li ng-repeat="something"></li>
</div>
However when the "Scroll to top" is click it only works first time since the url changes to ...#search-bar and when you click it again nothing happens. So how do I scroll to top without changing the url?
And also question how do I make the "Scroll to top" only show when the search-bar is not showing?
I was thinking about using $anchorScroll and using id'ed numbers on li and if it's higher then "element-3" then show the button, however not sure if that would work.
UPDATE:
I am thinking of following this example, that is using navigation bars that is #search and #results and make the #search href visible on #results active and #results one hidden.

You can do this without jQuery as well:
function filterPath(string) {
return string
.replace(/^\//, '')
.replace(/(index|default).[a-zA-Z]{3,4}$/, '')
.replace(/\/$/, '');
}
const locationPath = filterPath(location.pathname);
document.querySelectorAll('a[href*="#"]').forEach(link => {
let thisPath = filterPath(link.pathname) || locationPath;
if ((location.hostname == link.hostname || !link.hostname)
&& (locationPath == thisPath)
) {
let hashName = link.hash.replace(/#/, '');
if (hashName) {
let targetEl = document.getElementById(hashName);
if (targetEl) {
link.addEventListener('click', () => {
event.preventDefault();
targetEl.scrollIntoView({
top: 50,
left: 0,
behavior: "smooth"
});
});
}
}
}
});

Here is how you can do it. Create a button:
Scroll To Top
CSS:
.scrollToTop{
width:100px;
height:130px;
padding:10px;
text-align:center;
background: whiteSmoke;
font-weight: bold;
color: #444;
text-decoration: none;
position:fixed;
top:75px;
right:40px;
display:none;
background: url('arrow_up.png') no-repeat 0px 20px;
}
.scrollToTop:hover{
text-decoration:none;
}
JavaScript:
$(document).ready(function(){
//Check to see if the window is top if not then display button
$(window).scroll(function(){
if ($(this).scrollTop() > 100) {
$('.scrollToTop').fadeIn();
} else {
$('.scrollToTop').fadeOut();
}
});
//Click event to scroll to top
$('.scrollToTop').click(function(){
$('html, body').animate({scrollTop : 0},800);
return false;
});
});
You can find a demo here. The source presented is taken from here.

How to show div with slide down effect only with javascript

I Want to show div on click with slideup effect using javascript(not jquery).
Here is my HTML code:-
<div class="title-box">show text</div>
<div class="box"><span class="activity-title">our regions bla bla</span></div>
Kindly advise me asap.

The question states that the solution needs to be done with pure JavaScript as opposed to jQuery, but it does not preclude the use of CSS. I would argue that CSS is the best approach because the slide effect is presentational.
See http://jsfiddle.net/L9s13nhf/
<html><head>
<style type="text/css">
#d {
height: 100px;
width: 100px;
border: 1px solid red;
margin-top: -200px;
transition: margin-top 2s;
}
#d.shown {
margin-top: 100px;
}
</style>
</head>
<body>
<button id="b">Toggle slide</button>
<div id="d">Weeeeeeee</div>
<script type="text/javascript">
var b = document.getElementById('b');
var d = document.getElementById('d');
b.addEventListener('click', function() {
d.classList.toggle('shown');
});
</script>
</body></html>
The basic algorithm is to add a class to the element you want to slide in/out whenever some button or link is clicked (I'd also argue that a button is more semantically appropriate here than an anchor tag which is more for linking web pages).
The CSS kicks in automatically and updates the margin-top of the sliding element to be visible on-screen. The transition property of the element tells the browser to animate the margin-top property for two seconds.

You can try below code:
Working Demo
document.getElementById('bar').onclick = (function()
{
var that, interval, step = 20,
id = document.getElementById('foo'),
handler = function()
{
that = that || this;
that.onclick = null;
id = document.getElementById('foo');
interval =setInterval (function()
{
id.style.top = (parseInt(id.style.top, 10) + step)+ 'px';
if (id.style.top === '0px' || id.style.top === '400px')
{
that.onclick = handler;
clearInterval(interval);
if (id.style.top === '400px')
{
id.style.display = 'none';
}
step *= -1;
}
else
{
id.style.display = 'block';
}
},100);
};
return handler;
}());

You can refer following below:
<div class="title-box">
show text
</div>
<div class="box" id="slidedown_demo" style="width:100px; height:80px; background:#ccc; text-align:center;">
<span class="activity-title">our regions bla bla</span>
</div>

Scroll helper for mobile website

I have a very long article page that I want to help mobile users scroll on. For very long lists in mobile apps there's usually a alphabetical index that can help users jump to various places in the list. How do I implement something like that for a webapp?
If it helps my stack is angularjs / jquery / phonegap.

Just use angular's built-in $anchorScroll service.
See the live example in angular's official docs. Here are the important pieces of code:
In your view template:
<div id="scrollArea" ng-controller="ScrollCtrl">
<a ng-click="gotoBottom()">Go to bottom</a>
<a id="bottom"></a> You're at the bottom!
</div>
In your controller:
function ScrollCtrl($scope, $location, $anchorScroll) {
$scope.gotoBottom = function (){
// set the location.hash to the id of
// the element you wish to scroll to.
$location.hash('bottom');
// call $anchorScroll()
$anchorScroll();
};
}

iOS7 Style List Navigator
If you want something nice on the phone, I just wrote this iOS7 style list navigator. I think the way Apple solved the problem is very straightforward. So we steal it.
It's written considering that you won't probably scroll the body, because in the many designs I've seen for smartphones, scrolling a container allows you to have fixed headers and footers for Android < 4 without getting mad.
A word of warning: this code is really fresh and untested.
SEE DEMO AND CODE
CSS (extract)
#scrolling {
padding-top: 44px;
overflow: scroll;
-webkit-overflow-scroll: touch;
height: 100%;
}
.menu {
position: fixed;
right: 0;
font-size: 12px;
text-align: center;
display: inline-block;
z-index: 2;
top: 58px;
}
.list .divider {
position: -webkit-sticky; /* will stop the label when it reaches the header */
top: 44px;
}
HTML (extract)
<div id="scrolling">
<ul class="menu">
<li>A</li>
<li>B</li>
<li>C</li>
<!-- etc -->
</ul>
<ul class="list">
<li class="divider" id="a">A</li>
<li>Amelia Webster</li>
<li>Andrew WifKinson</li>
<!-- etc -->
Javascript (zepto/jquery)
$(function() {
$(window).on("touchstart touchmove mouseover click", ".menu a", function(e) {
e.preventDefault();
clearInterval(t);
var steps = 25;
var padding = 68;
var target = $( $(this).attr("href") ).next("li");
if ( target.length > 0 ) {
var scroller = $("#scrolling")[0];
var step = parseInt((target[0].offsetTop - padding - scroller.scrollTop)/steps);
var stepno = 0;
setInterval( function() {
if ( stepno++ <= steps ) {
scroller.scrollTop += step;
} else {
clearInterval(t)
}
}, 20);
};
});
});
It performs a basic check of link validity before attempting the scroll. You can change padding to your needs.
Also, you will notice that we are targeting the first element after the required target. This is because Safari seems to go nuts because of the sticky positioning.
This code uses jQuery/Zepto selectors for the sake of brevity and readability. But these libraries are not really needed to achieve the result. With just a little extra digitation you could easily go dependency-free.
http://codepen.io/frapporti/pen/GtaLD

You can use a toggleable sidebar like this one. Resize your browser to the width of the screen of a mobile phone to understand what I mean.
Then create a directive in angularjs to wrap jQuery's animate function to scroll to a specific part in the article. Like this:
angular.module('yourModule', [])
.directive('scrollTo', function() {
return {
restrict : 'EA',
link: function(scope , element, attr){
$('html, body').animate({
scrollTop: $( attr['href'] ).offset().top
}, 300);
}
};
});
where href will be an id of a specific section in the article. Then all you need to do is apply the directive to the links in the sidebar.
...
<li><a href="#section-1" scroll-to>Jump to section 1</a></li>
...
Hope this helps.

This might be what you're looking for http://www.designkode.com/alphascroll-jquery-mobile/
Haven't used it myself, but seems pretty simple to get going with.

I think something like this could work for you: http://codepen.io/aecend/pen/AsnIE. This is just a basic prototype I put together to answer but I could expand on the concept if needed. Basically, it creates a translucent bar on the right side of the screen, finds each of the headings for articles (which would need to be adapted to suit your needs) and places clickable/tappable anchors to jump to individual articles. When you click one, the page scrolls to that article. I have a few ideas to make this actually usable, but here's the proof of concept.
CSS
#scrollhelper {
position: fixed;
top: 0;
right: 0;
height: 100%;
width: 5%;
background-color: rgba(0,0,0,0.2);
overflow: hidden;
}
#scrollhelper .point {
position: absolute;
display: block;
width: 100%;
height: 10px;
margin: 0 auto;
background-color: rgba(0,0,255,0.5);
}
JavaScript
var articles;
function buildScrollHelp() {
var bodyHeight = $("body").height();
var viewHeight = window.innerHeight;
$("#scrollhelper").html("");
articles.each(function() {
var top = $(this).offset().top;
var element = document.createElement("a");
element.className = "point";
element.href = "#" + $(this).attr("id");
element.style.top = ((top / bodyHeight) * viewHeight) + "px";
$(element).on("click", function(e){
e.preventDefault();
$('html, body').animate({
scrollTop: $($(this).attr("href")).offset().top
}, 500);
});
$("#scrollhelper")[0].appendChild(element);
});
}
$(document).ready(function() {
articles = $("body").children("[id]");
$("body").append("<div id=\"scrollhelper\"></div>");
$(window).resize(function(){
buildScrollHelp();
});
buildScrollHelp();
});

How to scroll back to the top of page on button click?

I am creating my product pages by using the object tag code, but every time I click the "view" button, the next page is staying at the same position of previous page which I just viewed. How can I add functionality that will let me view from the top of page every time I click the "view" button?
<div id="container" class="clearfix"><!--! end of #sidebar -->
<div class="holder"></div>
<div id="content" class="defaults"><!-- navigation holder -->
<div id="title2">Office Section</div>
<!-- item container -->
<ul id="itemContainer">
<li>
<div id="product">
<div id="title">FuBang®</div>
<div class="imageOuter" style="margin:0">
<a class="image" href="officesection010.html">
<span class="rollover" ></span>
<img class="imgborder" src="product/officesection/010.jpg" width="165" height="165" />
</a>
</div><br />
<div id="text">Sofa </div><br />
<div id="button">
View Details
</div>
</div>
</li>
</ul>
<br />
<div id="title2"></div>
<div class="holder"></div>
</div>
</div> <!--! end of #content -->
</div> <!--! end of #container -->
When I click the "View Details" button at a specific position "x" here: http://postimg.org/image/vgs0lwhtr/
The next page shows the same position "x", but I want it to jump to the top of page:
http://postimg.org/image/vn80e2lph/

Using Javascript:
document.body.scrollTop = document.documentElement.scrollTop = 0;
Using jQuery:
$(function() {
$('body').scrollTop(0);
});

jQuery(document).ready(function($){
$(window).scroll(function(){
if ($(this).scrollTop() > 50) {
$('#backToTop').fadeIn('slow');
} else {
$('#backToTop').fadeOut('slow');
}
});
$('#backToTop').click(function(){
$("html, body").animate({ scrollTop: 0 }, 500);
//$("html, body").scrollTop(0); //For without animation
return false;
});
});
please refere this, may this help

Sometimes placing scroll to body doesn't work if your current content is generated through jQuery (as it was in my case). In such situation you can just do following.
$(function() {
$('html').scrollTop(0);
});

A small issue with Subhash's jQuery solution is that you must call this code within $(document).ready() in order for your $('body') selector to work. The ready event may not fire before parts of your page have been rendered to the screen.
An better approach is to simply modify the user's location as a work-around to this browser 'feature':
//Above all of your $(document).ready(...) code
document.location = "#";

Simple HTML solution for jumping between page parts
// Place a tag like this where you would like to go
// in your case at the top
<a name="top"></a>
// you will reach there by click of this link better use an image reach their by clicking on this we can also use an image, align in right
last

Back to top button, works in all browsers.To change the scroll speed simply change the x in counter -= x here x = 10
function scrollToTop(){
var myBody = document.body;
var id = setInterval(secondFunction,1);
var height = window.pageYOffset;
var counter = height;
function secondFunction(){
if(window.pageYOffset == 0){
clearInterval(id);
}
else {
if(!!navigator.userAgent.match(/Trident/g) || !!navigator.userAgent.match(/MSIE/g)){
counter -= 10;
counter--;
document.documentElement.scrollTop = counter;
}
else {
counter -= 10;
counter--;
myBody.scrollTop = counter;
}
}
}
}
body {
height: 5000px;
margin: 0;
padding: 0;
}
.backToTop {
position: fixed;
/* Fixed at page */
top: auto;
bottom: 20px;
left: auto;
right: 20px;
background-color: crimson;
color: white;
padding: 5px;
cursor: pointer;
}
header {
position: relative;
top: 0;
left: 0;
width: 100%;
height: 100px;
background-color: black;
}
<!-- back to top button -->
<span class="backToTop" onclick="scrollToTop()">TOP</span>
<!-- Header -->
<header>
</header>

Assign an id="#body" and tabindex in the <body> tag
<body id="#body" tabindex="1">
and use jquery focus()
$(function() {
$("#body").attr("tabindex",-1).focus();
}

You can use this method:
function gototop() {
if (window.scrollY>0) {
window.scrollTo(0,window.scrollY-20)
setTimeout("gototop()",10)
}
}