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Front End Technology Articles
Page 547 of 652
Websockets Apache Server compatibility in HTML5
When an app is to be developed that displays new data whenever it is stored in a folder through XML, we use websockets apache server.Mod_websocket or php websocket can be used.we can also use self-hosted realtime web technology for realtime communication between server and client.A hosted realtime web solutions and realtime push aspect of your application can be offloaded.However, Apache server is not good in long-running persistant connections between server and client.Best solution for this is:While using Apache as application server we need to use second dedicated realtime webserver.Self hosted realtime webserver can be used to handle many concurrent connectionsA ...
Read MoreAllow only access to camera device in HTML5
The only access to camera device is not possible in iOS. The official specification suggests the following −A User Agent implementation of this specification is advised to seek user consent before initiating capture of content by microphone or camera. This may be necessary to meet regulatory, legal and best practice requirements related to the privacy of user data. In addition, the User Agent implementation is advised to provide an indication to the user when an input device is enabled and make it possible for the user to terminate such capture.Similarly, the User Agent is advised to offer user control, such ...
Read MorePlace autofocus in the text box when a page gets loaded without JavaScript support in HTML?
The autofocus attribute is a boolean attribute. When present, it specifies that an element should automatically get focus when the page loads. An example is given below First Name: Last Name:
Read MoreHTML 5 versus XHTML 1.0 Transitional
HTML is expressed as SGML and XHTML is expressed in XML. Creating XHTML is connected with more restrictions in the form of markup.Avoid using the or tags in XHTML 1.0 Transitional, as those are not an element of that specification.Convert from HTML to XHTMLAdd an XHTML to the first line of every pageAdd a xmlns attribute to the HTML element of every pageChange all element names to lowercaseClose all empty elementsChange all attribute names to lowercaseQuote all attribute values
Read MoreCan we delete the “getContext” property of HTML5 Canvas tag through script?
There is no description in HTML5 specification, which says deletion of a getContext property by the script is valid.We can write a code in which we delete getContext property of HTMLCanvasElement and then in the separate statement we make it undefined.Delete window.HTMLCanvasElement.prototype.getContext; _assertSame(window.HTMLCanvasElement.prototype.getContext, undefined, "window.HTMLCanvasElement.prototype.getContext", "undefined");
Read MoreHTML5 Geolocation without SSL connection
HTML 5 Geolocation is used to find out the location of the user. This can be without SSL connection. This can be generated as follows −// Variable apigeo shows successful location: var apigeo = function(position) { alert("API geolocation success!lat = " + position.coords.latitude + "lng = " + position.coords.longitude); }; var tryapigeo = function() { jQuery.post( "check the location on google map", function(success) { apiGeolocationSuccess({coords: {latitude: success.location.lat, longitude: success.location.lng}}); }) //Gives success on given geolocation .failure(function(err) { //On failure, alert with failure is shown alert("error while showing geolocation! "+err); ...
Read MoreWhat is the difference between SVG and HTML5 Canvas?
The HTML element is a container for SVG graphics. SVG stands for Scalable Vector Graphics. SVG and useful for defining graphics such as boxes, circles, text, etc. SVG stands for Scalable Vector Graphics and is a language for describing 2D-graphics and graphical applications in XML and the XML is then rendered by an SVG viewer. Most of the web browsers can display SVG just like they can display PNG, GIF, and JPG.The HTML element is used to draw graphics, via JavaScript. The element is a container for graphics.SVGHTML CanvasSVG has better scalability. So it can be printed with ...
Read MoreDrawing text to HTML5 <canvas> with @fontface does not work at the first time
Drawing text in a canvas with a typeface that is loaded via @font-face does not show text correctly at first. This is because the browser has not yet loaded the font from network. Therefore, it makes use of the font, which is already available.The font has to be completed loaded before it is used. This can be ensured using tag. If you want to make sure that the font is available and have some other elements preloaded, then you can do this by using the tag as under You can also load font like this −var newFont = ...
Read MoreHow to programmatically empty browser cache with HTML?
You can tell your browser not to cache your page by using the following meta tags − In addition, try the following: Append a parameter/string to the filename in the script tag. Change it when the file changes.Then the next time you update the file, just update the version i.e.
Read MorePreventing an image from being draggable or selectable in HTML without using JS
Add the following code snippet to image properties, and prevent images from being dragged and selected.img { user-drag: none; user-select: none; -moz-user-select: none; -webkit-user-drag: none; -webkit-user-select: none; -ms-user-select: none; }On double click on a text or image, it is highlighted (selected). The user select property can be used to prevent this. By setting this property to none, we can prevent our image from being selected (highlighted).ExampleYou can try to run the following code to prevent the image from being selected − img { -drag: none; user-select: none; -moz-user-select: none; -webkit-user-drag: none; -webkit-user-select: none; -ms-user-select: none; }
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