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Articles by karthikeya Boyini
Page 92 of 143
Phonegap + Windows Phone 8 : HTML5 viewport meta & scaling issue
Whenever you face such issue, it would mean you have not written the CSS properly.Just add the following in CSS −* { zoom:1; -ms-content-zooming:none; }For some code, even the following works −@viewport { width:320px; } @-ms-viewport { width:320px; zoom-user:fixed; max-zoom:1; min-zoom:1; }
Read MoreAnimating canvas to infinitely animate the noise to give the appearance of movement in HTML
The putImageData() method places the image data onto the canvas. To animate canvas, we create a reusable ImageData object outside the main loop,var ct = c.getContext("2d", {alpha: false}); // context without alpha channel. var a = ct.createImageData(c.width, c.height); var buffer = new Uint32Array(a.data.buffer); function loop() { noise(ct); requestAnimationFrame(loop) })() function noise(ct) { var l =buffer.length - 1; while(l--) buffer[l] = Math.random() >0; ct.putImageData(a, 0, 0); }
Read MoreHow do I get an address latitude-longitude using HTML5 Geolocation or Google API?
In order to get latitude and longitude using an HTML5 Geolocation or any Google API, we need to add JavaScript for this. The script is as follows −if (navigator.geolocation) { /* If current position is obtained then there is success otherwise there is failure. On failure, separate error message is shown */ navigator.geolocation.getCurrentPosition(successFunc, errorFunc); } else { alert(‘Geolocation is not enabled in your browser. Please use a latest browser to supports it.'); }
Read MoreHTML5 Canvas and select / drag-and-drop features in a JS library?
If you want to use HTML5 canvas to draw shapes, texts and curves and also want to attach traditional DOM events like onClick or drag and drop functions, a crossbar framework Raphael is used for doing drag and drop or touch events.This technology uses SVG and XML for older versions of IE. Drag and drag using HTML is shown below. Example Raphaël · Drag-n-drop ...
Read MoreHow to capture file not found exception in Java?
While using FileInputStream, FileOutputStream, and RandomAccessFile classes, we need to pass the path of the file to their constructors. In case of a file in the specified path does not exist a FileNotFoundException is raised.Examplepublic class Sample { public static void main(String args[]) throws Exception { File file = new File("myFile"); FileInputStream fis = new FileInputStream(file); System.out.println("Hello"); } }OutputException in thread "main" java.io.FileNotFoundException: myFile (The system cannot find the file specified) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.open(Unknown Source) at java.io.FileInputStream.(Unknown Source) ...
Read MoreHow to access the private methods of a class from outside of the class in Java?
You can access the private methods of a class using java reflection package.Step1 − Instantiate the Method class of the java.lang.reflect package by passing the method name of the method which is declared private.Step2 − Set the method accessible by passing value true to the setAccessible() method.Step3 − Finally, invoke the method using the invoke() method.Exampleimport java.lang.reflect.Method; public class DemoTest { private void sampleMethod() { System.out.println("hello"); } } public class SampleTest { public static void main(String args[]) throws Exception { Class c = Class.forName("DemoTest"); Object obj = c.newInstance(); ...
Read MoreHow do we initialize a variable in C++?
You can initialize a variable using the assignment operator or use its constructor when initializing it. For example,int i = 0; MyClass instance(1, "Hello");It will be automatically initialized ifIt's a class/struct instance in which the default constructor initializes all primitive types; like MyClass instance; You use array initializer syntax, e.g. int a[10] = {} (all zeroed) or int a[10] = {1,2}; (all zeroed except the first two items: a[0] == 1 and a[1] == 2) It is a global/extern variable It is defined static
Read MoreHow to build a java web application using SAP platform and HANA database?
You would require to change the connection.properties file of your local Tomcat Server (Server > Java Web Tomcat 8 Server-config/config_master/connection_data), to point to the HANA database.Here are the usual parameters that need to be configured for HANA databasejavax.persistence.jdbc.driver=com.sap.db.jdbc.Driver javax.persistence.jdbc.url=jdbc:sap://:/?reconnect=true&autocommit=false javax.persistence.jdbc.user=db-user javax.persistence.jdbc.password=db-pass eclipselink.target-database=HANA
Read MoreWhat MySQL returns, if the length of the original string is greater than the length specified as an argument in LPAD() or RPAD() functions?
In this case, MySQL will not pad anything and truncate the characters from the original string up to the value of length provided as the argument in LPAD() or RPAD() functions.Examplemysql> Select LPAD('ABCD',3,'*'); +--------------------+ | LPAD('ABCD',3,'*') | +--------------------+ | ABC | +--------------------+ 1 row in set (0.00 sec) mysql> Select RPAD('ABCD',3,'*'); +--------------------+ | RPAD('ABCD',3,'*') | +--------------------+ | ABC | +--------------------+ 1 row in set (0.00 sec)We can observe from the above example that both the functions do not pad ‘*’ and truncate the original string up to the length specified i.e. 3 as the argument.
Read MoreWhat is the use of MySQL BINARY keyword while performing string comparison?
When MySQL performs string comparison then it is not case-sensitive but with the help of BINARY keyword, MySQL can perform case-sensitive string comparison. It is because BINARY keyword instructs MySQL to compare the characters in the string using their underlying ASCII values rather than just their letters. It can be illustrated with the following example from table ‘Student_info’ having the following data −mysql> Select * from student_info; +------+---------+------------+------------+ | id | Name | Address | Subject | +------+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Chandigarh | ...
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