The HTML5 Server-Sent event model allows you to push realtime data updates from the server to the browser. In this tutorial we will work through the process, with the EventSource object handling received data and writing it to the page. We will use HTML5 and JavaScript at client side, with PHP at server side. With existing models such as AJAX, the code in a Web page would continually ask the server to supply new data, but the onus was on the client to request the information. With Server-Sent requests, you...
In the previous lesson, we examined the basic functions of our banner ad tracking system, including the retrieval of records for both banner ads and advertisers. In this lesson, we will look at the functions responsible for generating reports and manipulating the data in the ads table and advertiser table. The getClientsList() function retrieves active client records and sorts them alphabetically by client name: function getClientsList() { // get clients from db $sql = "SELECT ad_client_id,...
In our last session, we looked at the process of entering information on ad banners and ad clients, as well as generating ad activity reports. This week, we examine how to retrieve a random banner ad. We will also learn how to delete, activate and deactivate ads and clients. The getRandomAd() function retrieves a random ad by using the PHP rand() function. The function returns the ad’s primary key ID, client ID, title, URL and redirect path. The function also updates the activity table for this banner...
There are many JavaScript frameworks that leverage HTML5. Paper.js is one of these frameworks that uses Document Object Model (DOM) to structure objects in an easy-to-understand manner. It offers creative and neat ways of doing lots of stuff on a Web browser that supports the <canvas> tag. It also offers a new and interesting approach to drawing vector graphics. The basic setup is shown below: <script src="js/paper.js" type="text/javascript"></script> <script src="js/main.js"...
With CSS3, you can transform the appearance of Web page elements. The skew transform allows you to skew a particular element or group of elements, by supplying a number of degrees to skew along the X and Y axes. Your code needs to be tailored to the specific browsers supporting CSS3 and you do, of course, need to remember that not all browsers support these properties yet. The CSS3 skew transform can execute as the user interacts with your pages, and you can optionally include a transition within the effect....
CSS3 transforms allow you to apply various visual effects to the items in your Web pages, including scaling elements to either increase or decrease their size. The scale transform requires only a single CSS declaration, but to ensure your pages work in the different CSS3 supporting browsers, you do need to add amended versions of the declaration to your code. As with any transform, you can apply the CSS3 scale effect on user interaction, as well as using an animated transition. Create a Page ... Create...
In our last PHP Ad Tracker lesson, we constructed the database tables for our ad banner application. Now we are ready to construct the data object that will hold the variables and functions that will display, add, edit and delete the data in those tables. Once we name all of the variables and functions, we will start applying the code to them. Variables: The data object class will hold two variables: one to hold the banner ad ID number from the ads table, and one to hold the database connection information....
CSS3 offers a wealth of possibilities in terms of visual and interactive effects, even allowing you to create animated elements without the need for either Flash or JavaScript. In this tutorial we'll go through the process of translating a page element using a CSS3 transform. The translate function essentially moves an element by a specified distance along the X and Y axes. You do need to provide browser-specific code to create reliable transforms, but the technique is not particularly complex....