Develop Reference

How can i do onclick event with html,css,js

I want the css codes of the blog1popup class to change when the image is clicked.
I know how to do this with hover, but i don't know how to make this action happen by clicking.
The element I want to use as this button;
<div class="row">
<div class="col-lg-4 col-md-6 sm-mb-35px">
<div class="blog-item">
<div class="img">
<img src="assets/img/blog-grid-1.jpg" alt=""></a>
<span class="day">14</span> <span class="month">April</span>
</div>
Fransa Geneline Islak Mendil İhracı
<p style="padding-left: 30px; padding-bottom: 20px; margin-top: -25px; line-height: 20px;">Tüm dünya ülkelerine yardımseverliği gösteren ülkemize..</p>
</div>
</div>
This is the element I want to have changes in the css codes.
<div class="blog1popup"></div>
Example on hover technique;
.blog-item:hover > .blog1popup{
opacity: 100%;
}

You can add click event on blog-item class, then you can add classes to any element or change any css property using jquery methods.
Eg.
$(".blog-item").on("click", function (e) {
$(".blog1popup").css("opacity", "100%");
$(".blog1popup").addClass("any-class");
});

a robust way to toggle item display in Jquery

I want to toggle whether to display an item I should do the following:
$(item).css("display", "none")
$(item).css("display", "block")
But this method is not robust enough, given that the item might be "display: flex" or "display: table".
I think in react, I can just delete that element and re-render it when I need to, but is there any simple way to do that using jQuery besides directly modify the html to delete that element?
Thanks.

you should use toggleClass() in case you are working with flex then it would be a better approach to keep the flex properties in a separate class and add/remove or in easy words toggle the flex class if you want to hide or show that container with defaults set to display:none in a separate class, in this way either the container is flex or table it works either ways see the example below
$(".show").on('click', function() {
if ($(this).siblings('.my-item').css('display') == 'flex') {
$(this).siblings('.my-item').toggleClass('myflex');
} else {
$(this).siblings('.my-item').toggleClass('myTable');
}
})
.my-item {
display: none;
}
.myflex {
display: flex;
background-color: #f8f8f8;
}
.myTable {
display: block;
background-color: #d8d8d8;
}
.container {
margin-top: 10px;
border: 5px dashed #c8c8c8;
}
.show {
padding: 10px;
cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
<a class="show">TOGLLE THIS ITEM</a>
<div class="my-item myflex">1
</div>
</div>
<div class="container">
<a class="show">TOGLLE THIS ITEM</a>
<div class="my-item myflex">2
</div>
</div>
<div class="container">
<a class="show">TOGLLE THIS ITEM</a>
<div class="my-item myTable">TABLE DISPLAY
</div>
</div>
<div class="container">
<a class="show">TOGLLE THIS ITEM</a>
<div class="my-item myflex">3
</div>
</div>
<div class="container">
<a class="show">TOGLLE THIS ITEM</a>
<div class="my-item myflex">4
</div>
</div>
<div class="container">
<a class="show">TOGLLE THIS ITEM</a>
<div class="my-item myflex">5
</div>
</div>

You could also add a custom css class and switch them using below. This would also give a bit more control over styling.
$(item).addClass('display-none');
$(item).removeClass('display-none');
$(item).removeClass('display-none display-flex'); // For removing multiple classes
and for example the css properties would be like
.display-none{
display: none !important;
}

Why not just use jQuery's show/hide functions?
$(item).hide();
$(item).show();
hide function is roughly equivalent to calling .css( "display", "none" ), except that the value of the display property is saved in jQuery's data cache so that display can later be restored to its initial value. (from jQuery documentation)
$('#btnToggle').click(function(){
if($('#item').is(':visible'))
{
$('#item').hide();
}
else
{
$('#item').show();
}
$('#log').html("Current display state: " + $('#item').css('display'));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="btnToggle">toggle</button>
<div id="item" style="display: flex;">
flex div
</div>
<div id="log">
</div>

You can do a
$(item).css("display", "none")
and assign the flex or table value of the display property to any custom attribute, e.g. $(item).attr("disp_prop","flex") and on returning back to display you can do a simple.
$(item).css("display", $(item).attr("disp_prop"))

Replace class in order to replace image on click with jquery

I read a number of articles and answers here on Stack Overflow but none of them answered my question as I'm really a noob when it comes to jQuery and I'm not sure how to do this.
I have a HTML landing page on which I'm trying to show several images on which you click and they get replaced with another image and when clicked again or at another image the original one is shown.
I have this so far:
<div class="santa">
<img class="show" src="images/santa.png" alt="">
<img class="hide" src="images/bubble.png" alt="">
</div>
.hide { display: none; }
.show { display: block; }
I want to show santa.png by default and when clicked on to change it to bubble.png, meaning default class is show and when clicked on it's hide for santa and vice versa.
Thanks in advance!

The simple way to do this is to call toggle() on both the displayed and hidden images when one is clicked. This will invert the display state of both elements simultaneously:
$('.hide, .show').click(function() {
$(this).closest('div').find('.hide, .show').toggle();
})
.hide { display: none; }
.show { display: block; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="santa">
<img class="show" src="images/santa.png" alt="Santa">
<img class="hide" src="images/bubble.png" alt="Bubble">
</div>
<div class="santa">
<img class="show" src="images/santa.png" alt="Santa2">
<img class="hide" src="images/bubble.png" alt="Bubble2">
</div>
If you actually want to change the class values on the elements, then you can use toggleClass() instead:
$('.hide, .show').click(function() {
$(this).closest('div').find('.hide, .show').toggleClass('hide show');
})
.hide { display: none; }
.show { display: block; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="santa">
<img class="show" src="images/santa.png" alt="Santa">
<img class="hide" src="images/bubble.png" alt="Bubble">
</div>
<div class="santa">
<img class="show" src="images/santa.png" alt="Santa2">
<img class="hide" src="images/bubble.png" alt="Bubble2">
</div>

Since u are a beginner, my humble request is to learn vanillajs thoroughly before using libraries like jquery.
here is a pure js approach.. Cheers
let santaimg = document.getElementById('santa');
let bubbleimg = document.getElementById('bubble');
santaimg.onclick = showBubbleHideSanta;
function showBubbleHideSanta() {
santaimg.classList += " hide";
//santaimg.classList -= "show";
bubbleimg.classList -= " hide";
//bubbleimg.classList += "show";
}
.show {
display:block;
}
.hide {
display:none;
}
<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Jonathan_G_Meath_portrays_Santa_Claus.jpg/220px-Jonathan_G_Meath_portrays_Santa_Claus.jpg" id="santa" class="show"/>
<img src = "https://sophosnews.files.wordpress.com/2017/05/shutterstock_296886146.jpg?w=780&h=408&crop=1" id="bubble" class="hide"/>

Try this...if you have two images only...
HTML
<div class="santa">
<img class="show" src="http://via.placeholder.com/350x150" alt="img">
<img class="hide" src="http://via.placeholder.com/250x150" alt="img">
</div>
CSS
.show{
display:block;
}
.hide{
display:none;
}
img{
max-width:100%;
height:auto;
cursor:pointer;
}
JS
jQuery('.show, .hide').click(function() {
jQuery('.show, .hide').toggle();
});
Thanks !

If you want to show/hide an element I suggest you to use .hide() and .show()
It's pure JQuery and no need of CSS.
"The matched elements will be hidden immediately, with no animation. This is roughly equivalent to calling .css( "display", "none" ), except that the value of the display property is saved in jQuery's data cache so that display can later be restored to its initial value"
http://api.jquery.com/hide/
Here is an exemple:
HTML
<div>
<img class="santa_img" src="images/santa.png" alt="santa">
<img class="bubble_img" src="images/bubble.png" alt="bubble">
</div>
JS (JQuery)
$(".santa_img").click(function(){
$(".santa_img").hide();
$(".bubble_img").show();
})
$(".bubble_img").click(function(){
$(".bubble_img").hide();
$(".santa_img").show();
})
$(".bubble_img").hide(); //Hidden by default

Same javascript event for different images?

I have an image that when hover, a div with an overlay will fade in and out.
<div id="img-one">
<div id="overlay-one">
<div class="card-overlay-text">
<p>Enlarge Image<p></div>
</div>
<img src="assets/img/card_one.jpg" alt="" />
</div>
However, I have multiple images and I need to repeat this code for each of these images (assigned with different div's id). How can I get, when hover on specific image.
The code only run on individual image only?
$(function() {
$('#img-one').hover(function() {
$('#overlay-one').stop(true,true).fadeIn();
}, function() {
$('#overlay-one').stop(true,true).fadeOut();
});
});

Use general class in all the image containers div's and overlay div's, like :
<div id="img-one" class='img-container'>
<div id="overlay-one" class='overlay'>
...
</div>
</div>
Then adjust you JS code to invoke just related overlay :
$(function() {
$('.img-container').hover(function() {
$('.overlay', this).stop(true,true).fadeIn();
}, function() {
$('.overlay', this).stop(true,true).fadeOut();
});
});
Hope this helps.
$(function() {
$('.img-container').hover(function() {
$('.overlay', this).stop(true,true).fadeIn();
}, function() {
$('.overlay', this).stop(true,true).fadeOut();
});
});
.img-container{
background-color: green;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class='img-container'>
<div class='overlay'>
<div class="card-overlay-text">
<p>Enlarge Image 1<p></div>
</div>
</div>
<div class='img-container'>
<div class='overlay'>
<div class="card-overlay-text">
<p>Enlarge Image 2<p></div>
</div>
</div>
<div class='img-container'>
<div class='overlay'>
<div class="card-overlay-text">
<p>Enlarge Image 3<p></div>
</div>
</div>

You'll better use classes. Then do something like this:
$('.main-container').find('.div-class-name').forEach(function(el) {
<bind a handler for each consequent element here>
});
You'll end up with a bunch of handlers that are bound to each individual ".div-class-name" element.

It is recommended to use classes because that is what classes are for and id's are not.
If your case demands some situation where you have no control over the HTML part, you can use wildcards in attribute selectors in some cases. Like div[id^=overlay] to selects all div with id starting with overlay
$(function() {
$('div[id^=img]').hover(function() {
$('div[id^=overlay]',this).stop(true,true).fadeIn();
}, function() {
$('div[id^=overlay]',this).stop(true,true).fadeOut();
});
});
div[id^=img]{
position: relative;
height:100px;
width:100px;
border:1px solid black;
margin:2px;
}
div[id^=img] > div[id^=overlay]{
position:absolute;
background:rgba(0,0,0,.2);
top:0;
left:0;
right:0;
bottom:0;
display:none;
width:100px;
color:#fff;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="img-one">
<div id="overlay-one">
<div class="card-overlay-text">
<p>Enlarge Image 1<p></div>
</div>
<img width="100" src="https://upload.wikimedia.org/wikipedia/commons/e/ed/Raff_House.jpg" alt="" />
</div>
<div id="img-two">
<div id="overlay-two">
<div class="card-overlay-text">
<p>Enlarge Image 2<p></div>
</div>
<img width="100" src="https://upload.wikimedia.org/wikipedia/commons/e/ed/Raff_House.jpg" alt="" />
</div>

You can try with the jQuery Easy Overlay Plugin
http://eivissapp.github.io/jquery-easy-overlay/
In the code, you should assign a class to the images, and call this statement (that will work for each image):
jQuery("img.yourclass").hover(function(){
jQuery(this).easyOverlay("start");
}, function(){
jQuery(this).easyOverlay("stop");
});
If you have fontawesome in the page, then execute this before the code above (otherwhise the plugin will use the fontawesome spinner inside the overlay div):
jQuery.fn.easyOverlay.options = { spin: false }

How to make multiple divs slidetoggle with changing arrow

I'm very new to javascript and jQuery and has now got completely stuck despite trying various options. I'm trying to create a expand/collapse section with multiple divs. I would like each div to open and close seperately, with an arrow at the side pointing up or down, depending whether the content is expanded or collapsed.
From the code I have written below, only the first div works correctly. The only thing which happen When you click on the two other divs, is that the arrow in the first div change.
Any help will be greatly appreciated.
Following is the CSS:
#header_background {
background-image: url(header-background.png);
width:748px;
height:43px;
margin-left: -17px;}
#expand_arrow {
display: inline-block;
width: 17px;
height: 18px;
float:left;
margin-left:20px;
padding-left:0px;
padding-top:11px;
background-repeat:no-repeat; }
.sub_header {
color:#204187;
font-weight:bold;
font-size:16px;
vertical-align:middle;
padding-left:4px;
padding-top:12px;
float:left;
text-decoration:none;
}
Here's the attempted javascript and jQuery:
function chngimg() {
var img = document.getElementById('expand_arrow').src;
if (img.indexOf('expand-arrow.png')!=-1) {
document.getElementById('expand_arrow').src = 'images/collapse-arrow.png';
}
else {
document.getElementById('expand_arrow').src = 'images/expand-arrow.png';
}
}
$(document).ready(function(){
$("#header_background").click(function(){
$("#section").slideToggle("slow");
});
});
And here's the HTML
<div id="header_background" >
<img id="expand_arrow" alt="" src="images/collapse-arrow.png" onclick="chngimg()">
<div class="sub_header" onclick="chngimg()">header 1</div>
</div>
<div id="section" style="display:none">
text 1
</div>
<div id="header_background" >
<img id="expand_arrow" alt="" src="images/collapse-arrow.png" onclick="chngimg()">
<div class="sub_header" onclick="chngimg()">header 2</div>
</div>
<div id="section" style="display:none">
text 2
</div>
<div id="header_background" >
<img id="expand_arrow" alt="" src="images/collapse-arrow.png" onclick="chngimg()">
<div class="sub_header" onclick="chngimg()">header 3</div>
</div>
<div id="section" style="display:none">
text 3
</div>

It's only working for the first set of elements because you're using IDs, and IDs have to be unique within the document (page). You could change to using classes and perform some simple DOM traversal to get the corresponding section based on the header that was clicked. Something like this:
$(document).ready(function() {
$('.header_background').click(function(e) {
$(this).next('.section').slideToggle('slow');
var img = $(this).find('img.expand_arrow')[0]; // the actual DOM element for the image
if (img.src.indexOf('expand-arrow.png') != -1) {
img.src = 'images/collapse-arrow.png';
}
else {
img.src = 'images/expand-arrow.png';
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="header_background" >
<img class="expand_arrow" alt="" src="images/collapse-arrow.png">
<div class="sub_header">header 1</div>
</div>
<div class="section" style="display:none">
text 1
</div>
<div class="header_background" >
<img class="expand_arrow" alt="" src="images/collapse-arrow.png">
<div class="sub_header">header 2</div>
</div>
<div class="section" style="display:none">
text 2
</div>
<div class="header_background" >
<img class="expand_arrow" alt="" src="images/collapse-arrow.png">
<div class="sub_header">header 3</div>
</div>
<div class="section" style="display:none">
text 3
</div>

Look for your next section of the header clicked like so. And change your id for class because ID need to be unique
$(".header_background").click(function(){
$(this).nextAll(".section:first").slideToggle("slow");
});