Var botElement = topElement + $element.height() Var botView = topView + $(window).height() Get the current page visible area in the user screen COMPLETELY visible in the user viewport We are using append() outside the loop to improve performance.įor scaffolding purposes, we are using the Twitter Bootstrap plugin, so that the images are organized three per row using col-md-4 and row classes.Īnd finally, with the flickr div filled with our structure, we call the isVisible function and lazyLoadImage function which are defined as: A common mistake made by developers is to call append inside every loop. Observe that we are only constructing the string inside the loop and not appending it to the imagelist. $(".flickr").html("Error while loading images") Finally, we append the images to the flickr div outside the loop. If it is, display an error message to the user. The next step is to check if imageList is empty. the data-src attribute with the real flickr image pathĪnd a element with the image title displayed below the respective image. the current src attribute as a loading gif imageģ. We then loop through the response and create a new for each element.Ģ. We use $.getJSON to fetch data from the flickr service. The lazyLoadImage() function which we will define shortly, is called on the page scroll. After the flickr response call the lazyLoadImage function Wrap every three elements in a div row for scaffolding purposes Create a figcaption element with the image title - the data-src with the real flickr image path Create a new figure element with an img element with: When the page is scrolled call the lazyLoadImage function I have added some comments in the code to help you understand what’s going on: To begin with, we will need a simple as follows:įor layout purpose, this example uses css kept in Images/css/flickr.cssĬonsider the following piece of code. This makes the page load faster and also reduces the load on the server, by not requesting all the images at one go.Ĭreate a new file ‘FlickrLazyload.html’ and an ‘Images’ folder. Images outside of the viewport are not loaded, until the user scrolls to them. Lazy Loading is delaying the loading of images, particularly in long web pages that has a lot of images. We will use Twitter Bootstrap to make our page Responsive Design enabled. With this information under our belt, let's request a collection of photos from Flickr and display them on a page. So our request url will be similar to the following: Internally jQuery’s $.getJSON() function treats this request as if the web browser was requesting an external JavaScript file and thus makes the call successful. To get around that problem, we use the &jsoncallback=? piece to notify the external wesbite that we want to receive JSONP data. For security reasons you can’t send an XMLHTTP request to a different domain. We want data in JSON format, so we will add &format=json to the query string.įinally, in order to successfully request JSON data from another website, we will add one last bit to the URL: &jsoncallback=?. The Flickr photo feed service can return photo information in many different formats like RSS, Atom, CSV, and JSON. In the url, add the tag keyword to the URL to specify a tag for example: &tags=nature A tag is a word or short phrase that the photo owner uses to describe an element of the photo. Once you know which type of photo feed you’d like, you can search for tags on that Flickr’s public photo feed. To access photos from user accounts, you can use. The Flickr Feed Service allows you to get a listing of the 20 most recent photos from a particular person or a particular group. Flickr is a popular photo-sharing site and provides a couple of ways to retrieve photos and related information.
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