Web Technology Questions

- Name based is the virtual hosting that allows the virtual hosts to serve multiple hostnames that runs on single machine and having only one IP address.

- This is used when the web browser is used to request the resource from the server then the server respond using the hostname. 

- Web server uses HTTP protocol to respond to the requested hostname as the part of the request. 

- The server contains all the information of the website and the user that requests for the resources given. 

- Name based web hosting includes the resources and services that need to be given at the time of client’s request.

The cursor can set to wait in JavaScript by using the property ‘cursor’ property. The following example illustrates the usage.

window.document.body.style.cursor = "wait"; 

Arrays are created by using new Array() in Java Script.

For example : var employees = new Array();

The elements to this array is assigned as follows :

employees[0] = "Kumar"

employees[1] = "Fedrick"

- External Style Sheets are useful as it keeps the style and content separately and doesn’t allow it to mix with each other. It can control the styles for multiple documents, whereas inline style mixes the content with the style and make the code messier.

- External style sheet allows the creation of various classes in a structured way, whereas inline style sheet can’t create or control class elements.

- External style sheet can use selector and grouping methods to apply styles, whereas inline styles can’t use selector and grouping methods.

The storage of cookies on the hard disk depends on OS and the browser. The Netscape navigator on Windows, the file cookies.txt contains all the cookies. The path is :

c:\Program Files\Netscape\Users\username\cookies.txt

The Internet Explorer stores the cookies on a file by name username@website.txt is

c:\Windows\Cookies\username@Website.txt

The elements of JavaScript are accessed by their names. By default the browser is accessed by the element ‘windows’ and the page by ‘document’. The corresponding element has user defined names for forms and its elements. For example

var pwd = windows.document.frmLogin.password.value;

assigns the value of the password field of the form fromLogin in the current document, where password is the name of the element and frmLogin is the name of the form. Like wise any form element is accessed.

- Web accelerators are used to increase the loading of the web page faster and by providing extra features of caching, etc. 

- There are tools that are provided like internet accelerator of browser accelerator that provides security from the spyware and adware programs. 

- The security from the programs are required as they are harmful for the computer and the tools uses the strategies of pre-caching in which the data is automatically cached and when the website is opened again then the fetching is being done from the place where the content is saved. 

- Registry tweaks are used to improve the performance offering the risk management techniques for downloading the resources.

drawImage(image,x,y) method is used to draw an image on the canvas.