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HTML image maps allow the web page design to break an image into parts, each of whom has a different behavior when it does click to jump another page .

define an image map with HTML

Create a skeleton of the image in some map its website introducing the following HTML syntax. The name is necessary to refer to the map of the image itself .

Held Area elements within the map created in the previous step, one for each region can click on the image. The format for the area elements is :

Specify how each area element of how to assign a value attribute Rect, Circle, or POLY. [== === ==][=] Specify the coordinates of each element are by assigning coordinates the attribute value of a list of coordinates separated by commas. For Rect specify the left, top, right, down, and Circle, specify the center of the x coordinate, and their coordination, and radio; POLY to specify a series of X and Y coordinates .

Specify the destination to go to when the user clicks on each area element of assigning a URL href attribute value, as mipagina.html .

Add the usemap attributed to the image you’re mapping to tell the browser that the map you want to use that image. Example:

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concerns bulleted lists, lists as disorderly, in contrast to the lists of numbered points, which ordered the call lists . Disorderly lists are created using the element. Whether bulleted or numbered lists are a great way to improve the readability of their websites .

Defining an unordered list with HTML

Find a place in the page where we will build an unordered list .

Create the skeleton of the unordered list, by introducing an opening and closing tag. [ === ====][=] Form the unordered list by adding a class, style or list of specific attributes such as type specify how the bullet .

Individual Add to the list of items the unordered list by creating … elements between the opening and closing tags .

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superscript used for references to the note, as well as mathematical formulas. In HTML, superscripts specified by the element SUP .

Set in superscript text HTML

Find the text you want superscripted.

Enter an opening tag before the text and a closing tag later. The code for x2 y2 = 1 appears as follows: x2 y2 = 1

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subscript text is indispensable when presented chemical formulas and mathematical expressions. In HTML, subscript text can be specified with element subscript .

Set Text HTML

Place the text to be within a subscript beginning and ending tag, as shown in the line below: The chemical formula for water is H2O .

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There are multiple ways to delete data from a database in MySQL. Sometimes it may even be necessary to delete any pictures, because some tables are temporary - created to be the subject of a consultation SELECT INTO - and the need to be deleted after you’ve finished using them. MySQL allows you to delete rows, as a whole or even tables databases full of individual .

Delete records from a database MySQL Query

Rows to be deleted. You need to use SELECT query rows you want to delete before disposing actually .

Use the SELECT to prevent an error in the where clause. Using SELECT first make sure you have the data you really want to delete. Otherwise, the Delete command could be unrecoverable and you could lose data. This example deletes all customers with a balance of more than 0 of the customer database. Example: SELECT * from clients where balance> 0.0 ;

Remove the ranks. This consultation is almost identical to the SELECT query. This will drop these rows of the table, so make sure you really want to do it! Example: elimination of customers when balance> 0.0 ;

Remove the tables in a MySQL database

Remove the table. Deleting a table called “fall” and that is a very simple command. In this initial form, will give an error if the table does not exist. Example: drop table customers ;

Remove the table if it exists. It is easier to use this form rather than manually check to see if there is a table and then drop, or trying to remove a table that does not exist and having to deal with the error. Example: drop table IF EXISTS customers ;

Drop a temporary table. There is a limit of the drip command only temporary tables that are marked. It is safer way to drop temporary tables. Example: DROP temporary table customers ;

Remove databases MySQL

drop the basis of data using one of two forms of DROP. This will reduce the complete database and all tables in the database. Example: DROP Drop a database customers_db ;

database only if it exists. This command will remove an error message if the database does not exist. Example: drop database IF EXISTS customers_db ;

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echo function (or more precisely the construction of a language) is one of the most frequently used functions in PHP. All programming languages have a function that allows you to print text in the browser, and echo that is the function that is responsible for this in PHP .

Echo Variables Using PHP Advanced Simply

Pay attention to the general syntax of eco function: void echo ($ string arg1 [, chain $...]) If you are new to PHP (or programming in general) the example above could see incomprehensible and terrifying, but in reality it is very easy in practice .

Write a very simple example: $ = name “John Smith”; echo $ name; East script defines a variable name, which stores the value - in this case, John Smith. If we print the value of the variable name on the screen, what we do with the role echo .

prove a more difficult Example

[=== = ] Write a harder example - that do not use a chain, but it shows today’s date. First, calculated on the date of the date (), and then the result of departure using the echo. $ Today = date ( “YMD”); echo “Today is: $ .”;

today Apply special effects if they so wish. For example, you can focus the text, make it bold, printed in italics and so on. Plain HTML is used for this purpose .

Learn to Echo in an advanced mode

Use the echo output to several variables to once. Here is an example that employs a more complex environmental variable ($ browser = $ HTTP_USER_AGENT), in addition to the already familiar as variable dollars today, time and $ $ Name:

expect the first line of this script to print "Hello John Smith, ". The second line will print the current date and time and type of visitor's browser. The output will be in two lines - since you're using the>

Concatenation variables (or fusion, in secular terms) or pass multiple parameters consecutively rather than concatenate. The choice is yours, and the final result is the same .

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Displaying an image in HTML is simply a question of creating a label that names of image file and specifies some of its attributes . The images are easy to create and add a tremendous resource for websites .

Create image

Use a text file or HTML editor to help you get your picture on the website .

Type the following :

replace the “myImage.gif” with the name File graphic to display .

Change out “This is my image” consistent with the text you want to show to viewers who have chosen not to view the images. Thus, these viewers will have an idea of what is happening and will not be tempted to click off your page .

Substitute the number next to the width and height attributes with the numbers reflect the number of pixels wide and high you want the image box to occupy .

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Occasionally, a method that I find a mistake, when it will fail and will tell you about it through a mechanism called an exception. In Ruby, exceptions arise when a method you find a mistake, will have its rescue program and handle the error .

Launches an exception

[= == =] Write some code to throw an exception, using the statement to make. In Ruby, raising the statement will stop implementing the method, then the rest .

Include the call to this method in a statement rescue matching. Otherwise, the final program and an error message will be displayed in the terminal. The following example shows an average of function, such as that found in grade book software .

Here, all test results are averaged. If the result is over 100%, there is no choice but to raise an exception because someone has cheated: def average (num1, num2, num3) av = (num1 num2 num3) / av 3.0if> 100raise “Someone cheated, the average is # () av “elsereturn avendend

Handle the exception

Write rescue the statement, calling the average method deputy a block with a ransom .

statement starting block with “begin”. You can have any number of “rescue” statements, and ends with the “end” of keywords. The statement rescue is a type of clause, as well: a type followed by => and a variable name. Excluding the type declaration will allow the rescue to catch all exceptions thrown .

When the declaration was made rescue, which raised the value ascribed to “e. ” There can be multiple statements rescue with multiple types of handling different types of errors: beginaverage (98, 92, 130) rescue => eputs “I caught someone cheating!” Puts “The error message is this: # () and” end [Write ====]

Else statements and ensure

Create a statement ensure, in addition the declaration of surrender. The statement guaranteed always runs when the bloc is over. Regardless of how he left the block, whether or not there was an exception raised, including whether or not to rescue the exception itself, ensure the statement is always executed. The other allegation is executed only if there are no exceptions .

Here you want to make sure that the grade book is closed, thus ensuring close_grade book is called: beginaverage (98, 92, 130) rescue => eputs “I caught someone cheating!” Puts “The error message is this: # (e)”> Write a ensureclose_gradebookend

else. If there are no exceptions, another statement to congratulate the students for not cheating: elseputs “Well done, and you do not even cheat !”

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data reading and writing data to a file are common tasks in programming. The Ruby has a number of methods that make it easy to input a file entry .

a file

Identify filename of the file you want to open and .

Determine if you want to read the file, writing to file or both. If you want to read a file, go “r” as the second argument to File.open. If you want to write, transmit “w”. To do both, spend “r “.

create a new file in order File.open method and store the result in a variable f = File.open (” myfile . txt “,” R “)

Use one of a series of methods to read and write the file. To read each line in order, you can use the method each_line, which has a block as an argument, deputy to do … end keywords, or {…} braces. Reading a file in this manner is similar to iterating over an array f = File.open ( “myfile.txt”, “r”) f.each_line do | line | puts “I read this line: line # ( ) “End [Read ====]

individual chains data format in several ways. After opening the file method is used to read a line and store the result in a variable f = File.open ( “myfile.txt”, “r”) line = f.getsputs “The line that I read is: # (Use the line }”

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Use the shortcut for each_line method, the method File.foreach. This method opens the file and uses each_line without having to open the file yourself. It also closes the file when it is finished: File.foreach ( “myfile.txt”) do | line | puts “I read this line: line # ( ) “Use the end

ReadLine method in situations where it would be easier to read any file lines in an array. Readline The method returns an array of all lines. following example will open a file, read all the lines with readline, then iterate on the array returned and print all lines: f = File.open ( “myfile.txt”, “r”) = lines f.readlineslines.each do | | puts “I read this line: line # ()” Final

file

Close Close file with the close method. Remember to call the close method, otherwise the file would never be closed: f = File.open ( “myfile.txt”, “r”) # … Do something with the filef.close [= Close ===]

automatically if no need to keep the record open for long. File.open The method can take a block as an argument .

Pass block, and the file will be closed automatically at the end of the block. File.open also return the result of the block if one is passed to it, as opposed to a file handle. Blocks automatically return the result of his last speech. In this example , File.open returns the result of the ReadLine method despite the fact that there is no return statement: lines = File.open ( “myfile.txt”, “r”) do | file | file.readlinesend

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Learning to introduce a file in Perl is both simple and very useful .

Create a FILEHANDLE , Is the way it interacts with Perl files .

Open the file with the command open, which has two parameters. The first parameter is the name of FILEHANDLE to create. For purposes of standardization, most people use capital letters for FILEHANDLE their names. The second parameter is the name of the file to be opened. Example: open (MyFile, “

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