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Web Programming
Web Programming is the category for programming for the Internet and World Wide Web. Q&A's include coding in technologies used for Browser, applet based applications, and more.
584 Questions
Why do web browsers make separate requests for every image on a web page?
The answer has to do with the way content is interpreted by the browser.
Simple answer:
The HTML content of the page is stored as text. Images are easily stored as separate binary files. The browser is software that takes code and process it to display a more human friendly version on screen. As the browser finds a reference to an image in the HTML code it downloads it, then places it in the page per the HTML instructions.
Longer answer:
To make it easier for web programmers to design sites, the HTML code of a webpage is written in plain language, or text. To use other content on the same page, lines of code are written that reference other files. since they are text files, they must be converted to and from binary to transmit them over the internet.
Images have a level of compression or data structure applied to them, so they are more easily stored as binary files. there is no translation that occurs as they are transmitted online.
Computers run through code character by character, line by line and run functions when certain instructions are read. Once the browser sees an tag it knows the current page is referencing an image so it downloads it.
There are two reason I can that of why images are transmitted as separate requests:
* Images can be stored on different web servers, so sending one large binary stream would require one server to assemble all of the data then transmit it to the user (quite a waste to transmit the same file data twice.)
* Because images can be in different formats, using different compressions (jpeg, gif, png). Each image is transmitted separately so as not to cause problems. Addendum:
HTTP/1.1 protocol allows a browser to download all items in the same connection (so long as the connection is to the same server). This means at connection level there is only one request but at protocol level there are still multiple requests being passed through the one connexion.
Maybe you do, maybe you don't. In your web development toolbox, you may have RoR, PHP, Python, etc. No one can do most jobs any better than another, its upto you which you want to use.
white spaces is allowed in xml but not before the xml declaration.
white space before the xml declaration is interpreted as a processing instruction.
Why is xml knowledge important to implement DITA?
The Darwin Information Typing Architecture (DITA) is an OASIS standard XML data model for authoring and publishing. Many third party tools support authoring, including Adobe FrameMaker, XMetaL, Arbortext, Quark XML Author, Oxygen XML Editor, easyDITA, and SDL Xopus. With the DITA Open Toolkit publishing system, DITA features single source publishing, inheritance, topic-based authoring, and content reuse.
To get the best out of DITA and o be able to create DITA contentyou will need to understand xml syntax because DITA map and topic documents are XML files.
XML is not a programming language so it doesnt do anything. Its a markup language that allows you to tranport and store data independant of platform or device, so an xml file containing data could be transefered from a mac system to a windows based one.
What are the two main parts of an HTML file What tags create them?
The html page <html> </html> and also the body <body></body> which contains the content.
How do you ftp a GDG file to mainframe with management class using QUOTE or QUOTE SITE command?
FTP <hostname> enter user & password ASCII (or BINARY) QUOTE SITE LRECL=200 BLKSIZE=16000 RECFM=FB PUT <local filename> 'SOME.DATASET(+1)' - use (+1) to create the next generation of an existing GDG. use (0) to access the curent version and (-1) to access one prior generation. Any (-/+ n) value can be used as long as it references a valid GDG. Enclose the DSN in single quotes. - the GDG base has to exist, FTP PUT will not create the base - set LRECL and BLKSIZE values appropriately for your purpose
Data mining just means gathering information. The purpose of data mining is to collect as much information as possible about any particular issue so that analysts can spot trends and predict what is likely to happen next. It is useful for companies because it helps them tailor their goods and services for the market.
Which are the core modules of drupal?
Following are the core modules of drupal.
• Block: controlling content in the sidebars Restricted to web administrator access only.
• Filter: Input formats for user content
• Node: the content Enabled.
• System: corn and caching Primary Web Site Admin access only.
• User: access and management settings Enabled, web administrator access only.
How do you block swear words on webpages?
Using PHP for example and the string replacement attributed to replace the swear words with *** or something.
Is there a site that will convert an RSS feed into a plain text file?
An RSS feed is a plain text file. There's no conversion necessary.
What are the responsibilities of the database designer?
As the name implies, a database designer develops both the logical and physical design of the database. For hierarchical databases, they define the parent-child relationships and in relational tables, the relations between tables. They also often develop validation rules, constraints and the like.
How does you create a delete button in PHP using Dreamweaver?
That question doesn't make much sense...delete for what?
What is open-source server-side scripting and what is the use of open-source server-side scripting?
Many software developers are generous enough to let others use scripts they created for the benefit of the community. That is basically open-source in my view.
In other words anything that is free is open-source. You can modify the content using those scripts and build your own custom software, website, CMS (Content Management System like Wordpress, Joomla) and MVC Frameworks (Model View Controller).
What is the difference between a numericial array and an associative array?
A numericial array is an array with keys made up of only integers. An associative array is an array with keys made up of anything that is not an integer. In some languages, it is possible to mix integer keys and non-integer keys into a mixed array.
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An XML appliance is a special purpose network device used to secure, manage and mediate XML traffic. They are most popularly implemented in Service Oriented Architectures to control XML based Web Services traffic, and increasingly in cloud oriented computing to help enterprises integrate on premise applications with off premise cloud hosted applications. XML Appliances are also commonly referred to as SOA Appliances, SOA Gateways, XML Gateways,Cloud Brokers.
Microsoft .NET's System.Data.Common.DataAdapter is a class that is used to connect to a database and execute SQL queries, usually used with a System.Data.DataSet.
How do you make a site like lockerz or swagbucks?
Its pretty simple if you use a program like Clickteam Multimedia Fusion. I would use lacewing, create a server (lacewing-based) in a frame in Fusion and a client program separately. I would then program how the two programs talk to each other (over the lacewing server) and store all of my files server-side for security. You would then want to Program the search engine (I do not know how, but I will look into it) and make it so the client sends the points won to the server whenever it gets triggered (it is up to you to decide when to trigger it). Lastly, you would make an e-shop containing all of the free prizes that emails you with user info whenever a user buys a product so you know when to buy it. All revenue would be made through ads that you place on the applet (you embed this into your site using vitilize, since that is compatible) and then advertise your new site.
The Tomcat server is a Java based Web Application container that was created to run Servlets and JavaServer Pages (JSP) in Web applications. As part of Apache's open source Jakarta project, it has nearly become the industry accepted standard reference implementation for both the Servlets and JSP API. Written by expert Servlets and JSP software architect and author James Goodwill, this column will feature introductory Web application development issues, Tomcat installation and configuration, deploying Web applications onto Tomcat, Struts and much more.
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What is a word or phrase or graphic that you click to move from one location to another?
A hyperlink is used to move from one location to another, either to a different location on the same web page, or to a different web page. A hyperlink can either be a single word, a phrase, or a graphic image. That is, a hyperlink can be contructed such that clicking on a signe word, a phrase, or a picture will activate the hyperlink.
You will have to parse the xml, but that is time consuming when done by hand. The easiest and fastest method would be to use an xml tool that could parse it for you, like tinyxml, xerces or LiquidXml.
Why XML is free and extensible?
xml is free because it is an open technology that does not require software to create it. XML is extensible because you write your own xml code and the open source nature of xml means it can work with just about any system or utility.
