We Keep Coding

How to swap images from side bar to the middle div on clicking on those sidebar images?

I'm new to JavaScript and I'm trying to build a web page and I've 3 images of that product in my sidebar and one main image in the middle now I want to get the sidebar image in the middle when a user clicks on that sidebar image. I don't know how to go about this. I've already tried couple of ways which I've found online, one of them is this
1. How to swap image and video to another div?
But these are not working out for me.

What you have to do is save both images in a variable and then swap them. Look at the example below
var imgleft,
imgcenter,
$center = $(".center img");
$(".sidebar img").click(function(){
imgleft = $(this).attr("src");
imgcenter = $center.attr("src");
$center.attr("src", imgleft);
$(this).attr("src", imgcenter);
});
.sidebar{
position: absolute;
top: 0;
width: 70px;
height: 100%;
background: red;
}
.center{
width: 80px;
height: 80px;
margin:25% auto;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="sidebar">
<img src="http://placehold.it/70x70">
<img src="http://placehold.it/70x60">
<img src="http://placehold.it/70x50">
</div>
<div class="center">
<img src="http://placehold.it/70x40">
</div>

You can use javascript's event handling (on each of your sidebar images) to solve this problem. First add the following java script code in your html:
<script type="text/javascript">
function changeToImage1(){
if(centerImage.src != "[1st-image-url.*]"){
centerImage.src = "[1st-image-url.*]";
}
}
function changeToImage2(){
if(centerImage.src != "[2nd-image-url.*]"){
centerImage.src = "[2nd-image-url.*]";
}
}
function changeToImage3(){
if(centerImage.src != "[3rd-image-url.*]"){
centerImage.src = "[3rd-image-url.*]";
}
}
</script>
Then you can simply add the above functions in the onClick attributes of your three sidebar div's accordingly. This can be done like this:
<div id = "first" onclick = "changeToImage1()">
...
</div>
<div id = "second" onclick = "changeToImage2()">
...
</div>
<div id = "third" onclick = "changeToImage3()">
...
</div>

Smooth scroll to id except when user is already at that location

I'm running the following script when a user clicks on a button, to scroll to a specific div on the page, along with a few other unrelated functions.
The problem is that the button itself is supposed to always remains in view, and thus can be spam-clicked to cause the page to 'lag' while it's busy moving over and over to the same location. I would like to counter this behavior by only executing the scroll when the page is not already at that specific location.
Unfortunately I have no real experience working with JavaScript/jQuery and have not been able to find an example of something like this being used.
Here's my sample code:
HTML
<div id="navButton">Button</div>
<div id="listContent">Content that must be visible after button click goes here</div>
Script
window.onload=function(){
document.getElementById("navButton").onclick = function(){
$("html, body").animate({scrollTop: $("#listContent").offset().top -165}, 400);
}
}

Maybe this Example could help you... Change the hash first then listen to the hashchange Event. When you reload the page it will scroll down to your anchor.
$(document).ready(function() {
// check for hash when page has loaded
if (getHash() != null) {
checkForScrolling();
}
});
// check for hash when hash has changed
window.onhashchange = function() {
checkForScrolling();
};
// return hash if so or null if hash is empty
function getHash() {
var hash = window.location.hash.replace('#', '');
if (hash != '') {
return hash;
} else {
return null;
}
}
// this function handles your scrolling
function checkForScrolling() {
// first get your element by attribute selector
var elem = $('[data-anchor="' + getHash() + '"]');
// cheeck if element exists
if (elem.length > 0) {
$('html, body').stop().animate({
scrollTop: elem.offset().top
}, 300);
}
}
body {
font-family: Helvetica
}
section {
position: relative;
margin-bottom: 10px;
padding: 20px;
height: 300px;
background-color: #eee;
}
section a {
display: block;
position: absolute;
bottom: 10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
<h1 data-anchor="start">Smooth Scrolling</h1>
<ul>
<li>Scroll to Anchor 1
</li>
<li>Scroll to Anchor 2
</li>
<li>Scroll to Anchor 3
</li>
</ul>
<section>
<h2 data-anchor="1">First Anchor</h2>
Back to top
</section>
<section>
<h2 data-anchor="2">Second Anchor</h2>
Back to top
</section>
<section>
<h2 data-anchor="3">Third Anchor</h2>
Back to top
</section>
</div>

Try this if worked
<div id="navButton" onclick="moveElement('listContent');">Button</div>
<div id="listContent">Content that must be visible after button click goes here</div>
You will need jquery included for this script code
function moveElement(divId) {
$('html, body').animate({
scrollTop: $("#"+divId).offset().top
}, 2000);
}
And if you see it not working then try by adding below css. It will make gap between button and your div.
#navButton {
height: 300px;
border:1px solid green;
}
#listContent {
height: 900px;
border: 1px solid red;
}

JQuery - only last event handler triggers in event delegation series?

I been trying to build an image slider from scratch that will slide automatically but then go to a certain slide when the corresponding dot at the bottom is clicked.
When I isolate and test each of my event delegation click functions individually, they work great to get the different photos to slide back and forth. But when all functions are together only the 3rd function works. Can you help?
To demonstrate I made a simple mock-up slider here which includes the following JavaScript/jQuery:
'use strict';
$(document).ready(function () {
//DOM cache
var $slider = $('section');
var $slideContainer = $slider.find('ul');
var $windowWidth = $slider.css('width');
var $windowWidthUnitless = $slider.width();
var $dot1 = $slider.find('#dot-1');
var $dot2 = $slider.find('#dot-2');
var $dot3 = $slider.find('#dot-3');
//config
var width = $windowWidth;
var doubleWidth = $windowWidthUnitless * 2;
$($slider).on('click',$dot1,function() {
$slideContainer.css('margin-left', 0);
$dot1.addClass('filled');
$dot2.removeClass('filled');
$dot3.removeClass('filled');
})
$($slider).on('click',$dot2,function() {
$slideContainer.css('margin-left', '-' +width);
$dot1.removeClass('filled');
$dot2.addClass('filled');
$dot3.removeClass('filled');
})
$($slider).on('click',$dot3,function() {
$slideContainer.css('margin-left', "-" +doubleWidth +"px");
$dot1.removeClass('filled');
$dot2.removeClass('filled');
$dot3.addClass('filled');
})
});
Acting on this html:
<section>
<ul>
<li>
<div id="slide-1"></div>
</li>
<li>
<div id="slide-2"></div>
</li>
<li>
<div id="slide-3"></div>
</li>
<li>
<div id="slide-1"></div>
</li>
</ul>
<div class="selected" id="dot-1"></div>
<div id="dot-2"></div>
<div id="dot-3"></div>
and CSS
* {
margin: 0;
padding: 0;
} /* just my default */
section {
overflow: hidden;
width:400px;
height:400px;
}
section ul {
width:1600px;
}
section li {
list-style-type: none;
display: inline;
float: left;
}
[id*="slide-"] {
height: 400px;
width: 400px;
}
[id*="dot-"] {
float:left;
height: 40px;
width: 40px;
border-radius: 20px;
position: relative;
bottom: 45px;
}
(if this helps, here's a more exact but still simplified version of my slider, that actually slides automatically as well and is meant to stop and go to a certain slide when a dot is clicked. Again, it only goes to the last slide.)

In each of the $($slider).on('click',$dotNumber,function() {...} lines, replace $dotNumber with '#dot-number'.
Example: $($slider).on('click','#dot-1',function() {...}
I don't know if there's a particular way to pass a jQuery object to specify a child element to target, but I do know that adding the CSS selector as the second parameter will do it. According to the man page, the second parameter (if it's not the callback) is a string.

Selecting child of previous parent jQuery

Lately I've been trying my hand at animation using CSS and jQuery, it went well, however, now I want to do a bit more.
That is, once the user clicks information should show up on top of the image.
At the moment, I just have a few tags on which I perform the animations and class toggles.
My question is, I've thought about doing the following:
<div class= "singleImage">
<img src.... class="actualImage">
<p>text to put over the image</p>
</div>
This would be done per image which means that I'll have about 5 of them with different images.
However, I don't know how to go about selecting the previous element of class "actualImage".
Has anyone got any suggestions?
Thank you

Use the jQuery prev function. Example: Assume you want to select the image previous to the second image:
var foo = $(".singleImage").eq(1);
var bar = $(foo).prev().find('.actualImage');
Fiddle

Try this:
$('singleImage').children('.actualImage').prev();

I'm not sure why you are trying to select the previous element, but you could do something akin to this:
Bind a function to the click event for the element containing your image and caption.
Inside this function, toggle the caption.
Also, bind a click event handler to the body to detect clicks "off" the containing element.
HTML:
<a href="#" class="has-caption">
<img src="http://placehold.it/300x300" />
<span class="caption">This is a caption</span>
</a>
CSS:
a.has-caption { position: relative; }
a.has-caption .caption {
background: rgba(0, 0, 0, .25);
bottom: 0;
color: #fff;
display: none;
height: 20px;
left: 0;
line-height: 20px;
position: absolute;
width: 100%;
}
a.has-caption img { vertical-align: bottom }
JavaScript
$('a.has-caption').on('click', function(e) {
e.preventDefault(); e.stopPropagation();
var self = $(this)
, tmpId = 'toggle-' + Date.now();
self.addClass(tmpId);
$('span.caption', self).toggle();
$('body').one('click', function(e) {
if (!$(event.target).closest('.' + tmpId).length) {
$('span.caption', '.' + tmpId).hide();
self.removeClass(tmpId);
};
});
});
http://jsfiddle.net/83s7W/

.replaceWith() to replace content in a div for different link elements

I am trying to load a div with different content based on the link I click...
While it seems to work for the first link when I click it, clicking the other links only replaces the content with the same content for 'encodeMe' , yet I have specified different content that I want to replace for 'htmlize-me'
The first run-through of this I did not use jQuery's .bind() function. I simply used .click() , and both had the same result. Looking through the jQuery API I thought using the .bind() function would bind each function within it to that particular page element, but it seems to apply it to all my links.
I've achieved the same effect using .hide and .show to toggle divs but I want to be more elegant about how I do that, and this was my attempted alternative...
here's the relevant html:
<label for="list-root">App Hardening</label>
<input type="checkbox" id="list-root" />
<ol>
<li id="encode-me"><a class="show-popup" href="#">encodeMe()</a></li>
<li id="htmlize-me"><a class="show-popup" href="#">htmlizeMe()</a></li>
</ol>
<div class="overlay-bg">
<div class="overlay-content">
<div class="the-content"></div>
<br><button class="close-button">Close</button>
</div>
</div>
here's the script I made to trigger the content change:
$('#encode-me').bind('click' , function() {
$('div.the-content').replaceWith('<h3 style="color: #008ccc;"> function encodeMe( string ) </h3>' +
'Found in <p>[web root]/redacted/redacted.asp</p>');
});
});
$('#htmlize-me').bind('click' , function() {
$('div.the-content').replaceWith('Hi, Im something different');
});
});

Try something like this:
Use html() instead of replaceWith()
$('#encode-me').bind('click' , function() {
$('div.the-content').html('<h3 style="color: #008ccc;"> function encodeMe( string ) </h3>' +
'Found in <p>[web root]/redacted/redacted.asp</p>');
});
});
$('#htmlize-me').bind('click' , function() {
$('div.the-content').html("Hi, I'm something different");
});
});

replaceWith does exactly what it sounds like, it replaces the div with the h3, so when you click the second link there is no div.
Try setting the innerHTML instead
$('#encode-me').on('click' , function() {
$('div.the-content').html('<h3 style="color: #008ccc;"> function encodeMe( string ) </h3>Found in <p>[web root]/redacted/redacted.asp</p>');
});
$('#htmlize-me').on('click' , function() {
$('div.the-content').html('Hi, I\'m something different');
});

So I figured out a more clever way to do this! Use the DOM to your advantage - set up a nested list structure and change the content using .find() on parent and child elements the list.
Markup
<span style="font-size:1.4em">Type
<ul class="row">
<li>Blah
<div class="overlay-content">
<p></p>
<p class="changeText">Blah</p>
</div>
</li>
<li>Blah2
<div class="overlay-content">
<p></p>
<p class="changeText">Blah2</p>
</div>
</li>
</ul>
</span><br>
<!-- OVERLAYS -->
<div class="overlay"></div>
CSS
.close {
border-radius: 10px;
background-image: url(../img/close-overlay.png);
position: absolute;
right:-10px;
top:-15px;
z-index:1002;
height: 35px;
width: 35px;
}
.overlay {
position:absolute;
top:0;
left:0;
z-index:10;
height:100%;
width:100%;
background:#000;
filter:alpha(opacity=60);
-moz-opacity:.60;
opacity:.60;
display:none;
}
.overlay-content {
position:fixed!important;
width: 60%;
height: 80%;
top: 50%;
left: 50%;
background-color: #f5f5f5;
display:none;
z-index:1002;
padding: 10px;
margin: 0 0 0 -20%;
cursor: default;
border-radius: 4px;
box-shadow: 0 0 5px rgba(0,0,0,0.9);
}
Script
$(document).ready(function(){
$('.show-popup').click(function() {
var ce = this;
$('.overlay').show('slow', function() {
$(ce).parent().find('.overlay-content').fadeIn('slow');
});
});
// show popup when you click on the link
$('.show-popup').click(function(event){
event.preventDefault(); // disable normal link function so that it doesn't refresh the page
var docHeight = $(document).height(); //grab the height of the page
var scrollTop = $(window).scrollTop(); //grab the px value from the top of the page to where you're scrolling
$('.overlay').show().css({'height' : docHeight}); //display your popup and set height to the page height
$('.overlay-content').css({'top': scrollTop+100+'px'}); //set the content 100px from the window top
});
/*
// hides the popup if user clicks anywhere outside the container
$('.overlay').click(function(){
$('.overlay').hide();
})
*/
// prevents the overlay from closing if user clicks inside the popup overlay
$('.overlay-content').click(function(){
return false;
});
$('.close').click(function() {
$('.overlay-content').hide('slow', function() {
$('.overlay').fadeOut();
});
});
});