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Javascript Articles
Page 514 of 534
Improve performance of a HTML5 Canvas with particles bouncing around
To enhance the performance of Canvas with particles bouncing around, try the following:Separate the calculations from the drawing.Request a redraw after you have updated your calculations.Optimize collision detection by not testing evert particle against each other.Reduce callback usage.Reduce function calls.Inline.
Read MoreDifference between div~div and div:not(:first-of-type)?
Both are same in terms of matching elements. Let us see an example: If you have CSS rules with both selectors matching the same elements, then your div: not(:first-of-type) will get precedence due to the: first-of-type pseudo-class.
Read MoreWhat HTML5 tag should be used for filtering search results.
To filter search results, use the element. The header should be in the section of the search results: Search results
Read MoreHTML5 <audio> tag not working in Android Webview
Use Mediaplayer of Android for playing audio. You need to call function of Android from JavaScript that you have written in HTML file.WebView wv = (WebView) findViewById(R.id.webview); wv.addJavascriptInterface(new WebAppInterface(this), "Android"); public class WebAppInterface { Context mContext; WebAppInterface(Context c) { mContext = c; } @JavascriptInterface public void showToast(String toast) { Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show(); } }The following is my JavaScript: function showAndroidToast(toast) { Android.showToast(toast); }
Read MoreHow to set focus on a text input in a list with AngularJS and HTML5
To set focus on a text input in a list, try the following code:newApp.directive('focus', function () { return function (scope, element, attrs) { attrs.$observe('focus', function (newValue) { newValue === 'true' && element[0].focus(); }); } });The following is the HTML:{{cue.isNewest}}
Read MoreStrange cursor placement in modal when using autofocus in Internet Explorer with HTML
To solve this problem, use the following:.modal.fade { transition:opacity .3s linear; }You can also solve it by forcing the modal to fade in without sliding.windowClass: 'modal fade in'
Read MoreCancels ongoing watchPosition call in HTML5
The clearWatch method cancels an ongoing watchPosition call. When canceled, the watchPosition call stops retrieving updates about the current geographic location of the device. var watchID; var geoLoc; function showLocation(position) { var latitude = position.coords.latitude; var longitude = position.coords.longitude; alert("Latitude : " + latitude + " Longitude: " + longitude); } function errorHandler(err) ...
Read MoreError codes returned in the PositionError object HTML5 Geolocation
The following table describes the possible error codes returned in the PositionError object:CodeConstantDescription0UNKNOWN_ERRORThe method failed to retrieve the location of the device due to an unknown error.1PERMISSION_DENIEDThe method failed to retrieve the location of the device because the application does not have permission to use the Location Service.2POSITION_UNAVAILABLEThe location of the device could not be determined.3TIMEOUTThe method was unable to retrieve the location information within the specified maximum timeout interval.Following is a sample code, which makes use of the PositionError object. Here errorHandler method is a callback method:function errorHandler( err ) { if (err.code == 1) { ...
Read MoreHow to delete Web Storage?
Storing sensitive data on local machine could be dangerous and could leave a security hole. The Session Storage Data would be deleted by the browser immediately after the session gets terminated.To clear a local storage setting you would need to call localStorage.remove('key'); where 'key' is the key to the value you want to remove. If you want to clear all settings, you need to call localStorage.clear() method. localStorage.clear(); // Reset number of hits. if( localStorage.hits ){ ...
Read MoreMediaStream in HTML5
The MediaStream represents synchronized streams of media. If there is no audio tracks, it returns an empty array and it will check video stream, if webcam connected, stream.getVideoTracks() returns an array of one MediaStreamTrack representing the stream from the webcam.function gotStream(stream) { window.AudioContext = window.AudioContext || window.webkitAudioContext; var audioContext = new AudioContext(); // Create an AudioNode from the stream var mediaStreamSource = audioContext.createMediaStreamSource(stream); // Connect it to destination to hear yourself // or any other node for processing! mediaStreamSource.connect(audioContext.destination); } navigator.getUserMedia({audio:true}, gotStream);
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