Ways to switch out the background image using jQuery

I am currently using jQuery to dynamically change the background image of a web page. Right now, I have implemented two separate buttons that toggle between Image A and Image B. By default, Image A is displayed on the page.

My goal is to enhance this functionality by implementing a single button that switches the image and changes its label accordingly when clicked.

For Image A, the button should display "Zoom In". When clicked, Image B should replace Image A in the background, and the button text should change to "Zoom Out".

I hope that explanation makes sense!


jQuery(document).ready(function() {
   var images = ['image-A.gif'];

   var url = images[Math.floor(Math.random() * images.length)];
  var img = new Image();
  img.onload = function(){
    jQuery('#test').css({'background-image': 'url('+url+')','background-size' : 'cover', 'background-position' : '50px 0'});
jQuery('#test').fadeIn(1000);
  }
  img.src = url;
});

jQuery(function(){

jQuery("#aChange").click(function(){

    jQuery("#test").css("background-image", "url(image-B.gif)");
    jQuery("#test").css("background-position", "50px -100px");
    jQuery("#test").css("background-repeat", "no-repeat");
    jQuery("#test").css("background-size", "cover");

    return false;
});     

jQuery("#bChange").click(function(){

    jQuery("#test").css("background-image", "url(image-A.gif)");
    jQuery("#test").css("background-position", "50px 0");
    jQuery("#test").css("background-repeat", "no-repeat");
    jQuery("#test").css("background-size", "cover");

    return false;
});
});

Answer №1

To alternate between two background images in CSS, assign the classes

.image1 { background-image:url("here") }
and
.image2 { background-image:url("here") }
.

You can then toggle between the two by applying one to the background element with this jQuery script:

$('#theButton').click(function(){
    $('#background').toggleClass('image1').toggleClass('image2');
});

Did you know you can condense multiple CSS functions into one "line" like this?

$('.this').css({
    'color':'green',
    'border':'1px solid black',
    'position', 'absolute'
});

If you're not utilizing these features in jQuery, you're missing out on its true potential.

Answer №2

Here is a suggestion to achieve the desired outcome. You only need one button with the ID aChange.

jQuery(function() {
  jQuery('#aChange').click(function() {
    var text = jQuery('#aChange').val();

    if (text == "Zoom In") {

      jQuery("#test").css("background-image", "url(image-B.gif)");
      jQuery("#test").css("background-position", "50px -100px");
      jQuery("#test").css("background-repeat", "no-repeat");
      jQuery("#test").css("background-size", "cover");
    } 
    else {
      jQuery("#test").css("background-image", "url(image-A.gif)");
      jQuery("#test").css("background-position", "50px 0");
      jQuery("#test").css("background-repeat", "no-repeat");
      jQuery("#test").css("background-size", "cover");

    }
    jQuery('#aChange').val(text == "Zoom In" ? "Zoom Out" : "Zoom In");

  });
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input id="aChange" type="button" value="Zoom In">

Answer №3

$('.Zoom').click(function(){
    var $this = $(this);
    $this.toggleClass('Zoom');
    if($this.hasClass('Zoom')){
        $this.text('Zoom'); 
        $("html").css("background-color","yellow");
    } else {
        $this.text('Zoom Out');
        $("html").css("background-color","green");
    }
});

If my understanding is correct, this solution may be beneficial for you. Feel free to explore it: http://jsfiddle.net/V4u5X/703/

Answer №4

If you're looking to achieve this effect using just a little bit of jQuery and some CSS, check out the code below.

$("button").on("click", function() {
    $("body").toggleClass("img2");   
    $(this).text(function(i, text) {
        return text.indexOf("In") !== -1 && "Zoom Out" || "Zoom In";
    });
});
body {
    width: 100%;
    height: 100%;
    background-image: url("http://news.bbcimg.co.uk/media/images/76132000/jpg/_76132132_z3551404-blue_morpho_butterfly-spl.jpg");
    background-position: 50px 0;
    background-repeat: no-repeat;
    background-size: cover;
}

body.img2 {
   background-image: url("http://wallerz.net/wp-content/uploads/2014/10/4049_butterfly.jpg")
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button>Zoom In</button>

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