jquery css background image slideshow with transtion effect

问题

I need to add some nice transition fade effect to the change of the following simple sideshow:

    var images = [
 "http://static1.squarespace.com/static/550b669de4b0d91b0f49935d/t/551b6575e4b0c2174c3a6f54/1427858806833/flowers.jpg?format=1500w",
      "http://cimages.prvd.com/is/image/ProvideCommerce/PF_15_R105_MINIMAL_VA0211_W1_SQ?$PFCProductImage$",
      "https://i.kinja-img.com/gawker-media/image/upload/s--8a-AXhau--/c_scale,fl_progressive,q_80,w_800/zec3un8rzcmblrdlyswb.jpg",
      "http://media02.hongkiat.com/ww-flower-wallpapers/purplecrocus.jpg",
      "http://www.ninthstreetflowers.com/smp/Smp1/images/flower4.jpg",
      "http://magic-spells-and-potions.com/images/flower-language-vertical.png",
    ];

    var i = 0;
    var div;
    $(function() {

      div = $('.header_summer');
      console.log("loaded");
      setTimeout(changeBack, 1000);
    });

    function changeBack() {
      i = ++i % images.length;
      if (i > images.length) {
        i = 0;
      }
      console.log('url("' + images[i] + '");');

      // div.css('background-image', "url('" + images[i] + "')");

      // preload image check

//
  		$('<img/>').attr('src', images[i]).load(function() 
  		{
		   $(this).remove();
		   $('.header_summer').css('background', 'url("' + images[i] +'") no-repeat 0px 0px');
		});
		
		//
      setTimeout(changeBack, 5000);
    }

.header_summer  {
	background: url('../tpl/mblmhv1/images/summer_cover1.jpg') no-repeat 0px 0px;
	
	background-size: cover;
	min-height:920px; /* 800px; */
	
	
	
	/* TRANSISITION - not qorking here
	transition(background-image 0.5s ease-in-out);
	
    transition: opacity 1s ease-in-out;
    -webkit-transition: opacity 1s ease-in-out;
    -moz-transition: opacity 1s ease-in-out;
    -o-transition: opacity 1s ease-in-out;
    */
}

<script src="https://code.jquery.com/jquery-2.1.4.js"></script>
  <div class='header_summer'></div>

I have tried appending .fadeIn() to the jquery line that changes the image, and transition effects in the CSS - what am I missing?

回答1:

Try this:

.header_summer {
    background: url('../tpl/mblmhv1/images/summer_cover1.jpg') no-repeat 0px 0px;

    background-size: cover;
    min-height:920px; /* 800px; */
    transition: background-image 0.2s ease-in-out;
}

回答2:

It should work with just the transition property defined on your CSS class as any changes to the element should trigger the transition (i.e. when you update the background, you should see the transition):

.header_summer {
  background: url('http://static1.squarespace.com/static/550b669de4b0d91b0f49935d/t/551b6575e4b0c2174c3a6f54/1427858806833/flowers.jpg?format=1500w') no-repeat 0px 0px;
  background-size: cover;
  min-height: 920px;
  /* Transitions and their cross-browser friends */
  -webkit-transition: 1s ease-in-out;
  -moz-transition: 1s ease-in-out;
  -o-transition: 1s ease-in-out;
  transition: 1s ease-in-out;
}

The syntax generally uses the form <property> <duration> <timing-function> <delay>, so your current transition would be looking for the opacity property to change, which it doesn't seem to be.

You should consider using background instead :

transition: background 1s ease-in-out;
-webkit-transition: background 1s ease-in-out;
-moz-transition: background 1s ease-in-out;
-o-transition: background 1s ease-in-out;

Example

.header_summer {
  background: url('http://static1.squarespace.com/static/550b669de4b0d91b0f49935d/t/551b6575e4b0c2174c3a6f54/1427858806833/flowers.jpg?format=1500w') no-repeat 0px 0px;
  background-size: cover;
  min-height: 920px;

  -webkit-transition: 1s ease-in-out;
  -moz-transition: 1s ease-in-out;
  -o-transition: 1s ease-in-out;
  transition: 1s ease-in-out;
}

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Flowers and stuff...</title>
</head>

<body>
  <!-- Your element to switch through -->
  <div class='header_summer'></div>
  <script src="https://code.jquery.com/jquery-2.1.4.js"></script>
  <script>
    // Define your images
    var images = [
 "http://static1.squarespace.com/static/550b669de4b0d91b0f49935d/t/551b6575e4b0c2174c3a6f54/1427858806833/flowers.jpg?format=1500w",
      "http://cimages.prvd.com/is/image/ProvideCommerce/PF_15_R105_MINIMAL_VA0211_W1_SQ?$PFCProductImage$",
      "https://i.kinja-img.com/gawker-media/image/upload/s--8a-AXhau--/c_scale,fl_progressive,q_80,w_800/zec3un8rzcmblrdlyswb.jpg",
      "http://media02.hongkiat.com/ww-flower-wallpapers/purplecrocus.jpg",
      "http://www.ninthstreetflowers.com/smp/Smp1/images/flower4.jpg",
      "http://magic-spells-and-potions.com/images/flower-language-vertical.png",
    ];
     // Define your variables
    var i = 0;
    var div;
    $(function() {
      // Set up your div
      div = $('.header_summer');
      console.log("loaded");
      setTimeout(changeBack, 1000);
    });

    function changeBack() {
      i = ++i % images.length;
      if (i > images.length) {
        i = 0;
      }
      console.log('url("' + images[i] + '");');
      div.css('background-image', "url('" + images[i] + "')");
      setTimeout(changeBack, 5000);
    }
  </script>
</body>
</html>

来源：https://stackoverflow.com/questions/37333917/jquery-css-background-image-slideshow-with-transtion-effect

标签

javascript

jquery

html

css

transition