You can also set images to load within a percentage of the viewport height. Or you can use a script, to apply the options to all images on the page: You can either apply the threshold setting via the data-options tag: This image loads when it gets to within 200px of the viewport edge: This means the image will probably have preloaded by the time the user gets to it (unless they scroll down the page quickly). Instead, you can set the threshold to lazy-load the image before it comes into view. This means the user might notice the image loading. Images that are out of sight are lazy-loaded as soon as they enter the viewport (when the user scrolls down the page). To disable lazy loading of your responsive images, set lazy to false: not a responsive image), set resize to false: To use lazy loading on an image with fixed width or height (i.e. To remove the fade-in effect, apply this style in your HTML page: You can adjust the speed or opacity of the effect by adding -image-loading and -image-loaded classes to your page. The loading effect smoothly fades in the image, giving a discreet feeling. To use lazy loading, add a class of Sirv to an image, like so: Images out of view will not load unless the user scrolls down the page and they come into view. Only images within the viewable part of the page will load. This loading method fetches the image when it is needed, instead of fetching all images on page load. To help pages load as fast as possible, for the best user experience, Sirv responsive images automatically use lazy loading. This technique is ideal for full-page-width responsive images that you often see on home pages, to give a dramatic first impression. While the width will change depending on the size of the users screen, the height will remain the same: All of Sirv's 70+ dynamic imaging options are available.įor example, you can create a full width responsive image that is cropped to a certain height (in % or px). You can add other dynamic image effects to your responsive images. It is 32% smaller at 92KB (automatically served zipped at 39KB to the browser): Reference the sirv.js file, if it's not already in your page (it's the same file used for embedding zooms/spins):Īlternatively, use the lighter JavaScript file named (without Sirv Spin). Add class="Sirv" to your image and use data-src instead of src, for example:Ģ. Once the full image loads, the onLoad handler will trigger a state change and have an animated cross fade between the blurred placeholder image and the real hi-res image.To use responsive imaging, follow these two steps:ġ. The user's browser will then choose the optimal image and download that one instead of the src. This will load right away and take up minimal space on the initial download (the sample project placeholder is 1.5K gzipped). The code below has one img using the placeholder image, which is inlined as a datauri. See facebook's write up for further details. This delivers a fully rendered experience to the user as quick as possible without empty boxes or jumpy reflow/layouts. Placeholder images are tiny images that are inlined and blurred until the hi-res image is loaded. Optionally you make also create a placeholder image. Var responsive = require ( 'resize-image?sizes=200w,sizes=900w!./myImage.jpg' ) var img = require ( './myImage.jpg' ). This loader need to be set in the javascript source, not the webpack config file. The loader creates the various sized images and return the proper formated result for the property (including any file name changes for long term caching). Use the sizes param of the resize-image-loader to set all the desired widths. image sizeĩ00 px width image (resized & optimized srcset) Below is the render times with the full image vs a responsive one and a placeholder image. Sample MetricsĬheck out the test folder for a sample use case. This will greatly improve page load times and time to first render while reducing the cost for the user 2. Older browsers will default back to the normal src image. If srcset is supported the browser will use the device's screensize and pixel density to determine the best image to download. Modern browser have an additional attibute on the img tag called srcset. Resize-image-loader will create responsive images using webpack and gm so only the most effecient image is downloaded for the user's device. Hyper optimize your images to have massive improvement page load times.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |