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Showing posts from November 24, 2012

Javascript popup window

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Javascript popup window is the small window which is created by javascript. The syntax for javascript popup window is given below: window.open(url, name, [windowFeatures]) where url: The url of the page to open in the new window. name: A name is the name of the window. windowFeatures: They are the parameters which determines the various features of window to be included in the popup window like status bar, address bar,width,height, etc. The table shows the features and the string tokens you use: status     The status bar at the bottom of the window. toolbar     The standard browser toolbar, with buttons such as Back and Forward. location     The Location entry field where you enter the URL. menubar     The menu bar of the window directories     The standard browser directory buttons, such as What’s New and What’s Cool resizable     Allow/Disallow the user to resize the window....
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Javascript: alert box, prompt box and confirm box

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Alert box: It displays an alert dialog with a text message and OK button Example: Code: <html> <head> <script type=”text/javascript”> function showAlert() {     alert(“Hey!! This is an alert box”); } </script> </head> <body> <input type=”button” onClick=”showAlert()” value=”Show” /> </body> </html> In above example, only the text Hey!! This is an alert box appears. Prompt Box: Prompt is used to allow a user to enter something, and do something with that value. Code: <html> <head> <script type=”text/javascript”> function showPrompt() {     var name=prompt(“Please enter your name”, “Awaken Nepal”);     if(name!=null && name!=”")     {     document.write(“Hello”+name+”! How are you?”);     } } </script> </head> <body> <input type=”button” onClick=”showPrompt()...
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To show/hide any content using javascript

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Code: <script language=”javascript”> function showContent() { var ele = document.getElementById(“toggleText”); var text = document.getElementById(“displayText”); if(ele.style.display == “block”) { ele.style.display = “none”; text.innerHTML = “show”; } else { ele.style.display = “block”; text.innerHTML = “hide”; } } </script> <a id=”displayText” href=”javascript:showContent();”>show</a> <== click Here <div id=”toggleText” style=”display: none”><h1>This is hidden content</h1></div> Output: Before link is clicked After link is clicked  
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HTML Layouts – Using Tables

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Website Layouts Website Layout is very important to make your website look good. So you need to design your website properly. There is two ways of designing layout.  Using Table Using CSS(Without using table) Here, we will discuss using tables.
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Nesting of Table

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To use table inside of another table is called nesting of tables. As according to the need, we might need to show different information in an appropriate ways, so we need table inside another table.
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HTML Frames

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With frames, several Web pages can be displayed in the same browser window. Note: Do not expect frames to be supported in future versions of HTML. Frames allow for multiple .html documents to be displayed inside of one browser window at a time. This means that one page has no content on it, but rather tells the browser which web pages you would like to open. With the addition of CSS and PHP, frames have become outdated. The disadvantages of using frames are:     Frames are not expected to be supported in future versions of HTML     Frames are difficult to use. (Printing the entire page is difficult).     The web developer must keep track of more HTML documents The HTML frameset Element The frameset element holds one or more frame elements. Each frame element can hold a separate document. The frameset element states HOW MANY columns or rows there will be in the frameset, and HOW MUCH percentage/pixels of space will occupy e...
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HTML Forms

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HTML forms are used to pass data to a server. A form can contain input elements like text fields, checkboxes, radio-buttons, submit buttons and more. A form can also contain select lists, textarea, fieldset, legend, and label elements. The <form> tag is used to create an HTML form:
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MySQL: SQL

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SQL is a standard language for accessing and manipulating databases. To connect any and every database and to execute, insert, update or delete any records, we need SQL.. Brief description about SQL:     SQL stands for Structured Query Language     SQL lets you access and manipulate databases     SQL is an ANSI (American National Standards Institute) standard What Can SQL do?     SQL can execute queries against a database     SQL can retrieve data from a database     SQL can insert records in a database     SQL can update records in a database     SQL can delete records from a database     SQL can create new databases     SQL can create new tables in a database     SQL can create stored procedures in a database     SQL can create views in a database     SQL can set permissi...
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MySQL Connection

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Connection with MySQL Database Before accessing database, you must create a connection to the database Syntax: mysql_connect(servername,username,password); where, servername specifies the server to connect to. Default value is “localhost” username specifies the username to log in with. Default value is the name of the user that owns the server process. To connect offline we use username “root”. password specifies the password to log in with. Default is “” Code : Creating connection to the database and selecting the required database <?php $con = mysql_connect(“localhost”,”root”,”"); if (!$con) { die(‘Could not connect: ‘ . mysql_error()); } else{ mysql_select_db(“test”, $con) }; ?> Here, we have store connection in a variable called $con and trap error using die function. Closing connection The connection will be closed automatically when the script ends. To close the connection before, use the mysql_close() function: <?php $con = mysql_conne...
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MySQL: Introduction

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MySOL is a database. With PHP, default database is MySQL. Database is needed to create any dynamic website or web application. Records or information for any website is kept in database in the forms of tables. Table is the collection of related data entries and it consist of columns and rows. A row of information is called tuple. What is Query? Query is a question or a request. With the help of query you can show, add,edit and delete any record. How to create database? Its very simple, just open your database, create database as below: 1)Open link http://localhost/phpmyadmin. 2)Click on the database tab. 3)Give name of database and create like below.   now  I will inside the database called test as below: How to create tables? 1)Once you have created database, click on the database. For example, I have created a database called test. So  2) Create table on the database test. 3) Give table name and number of fields needed and click on c...
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PHP Error Handling

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All the possible errors should be managed in such a way, it should be debugged properly. So in this case default error handling is used which is very simple. An error message with filename, line number and a message describing the error is sent to the browser. Error handling is an important part while creating any web applications or scripts or pages. If you want your viewers to not display any errors on your web page then you following code on the top of your page:    error_reporting(0); or if you only want to see Warning Messages and not Notice Messages: ini_set('display_errors',1); error_reporting(E_ALL); Error Handling with die() function Lets try using a simple example below: Code: <?php if(isset($_POST['submit'])){ $filename=$_FILES['image']['name']; $tmp_name=$_FILES['image']['tmp_name']; if(!move_uploaded_file($tmp_name,"img".$filename)){ die("Error in uploading"); } else { print("Up...
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Sending Emails

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PHP makes use of mail() function to send an email. This function requires three mandatory arguments that specify the recipient’s email address, the subject of the the message and the actual message additionally there are other two optional parameters. mail( to, subject, message, headers, parameters ); Here is the description for each parameters. Parameter Description to Required. Specifies the receiver / receivers of the email subject Required. Specifies the subject of the email. This parameter cannot contain any newline characters message Required. Defines the message to be sent. Each line should be separated with a LF (\n). Lines should not exceed 70 characters headers Optional. Specifies additional headers, like From, Cc, and Bcc. The additional headers should be separated with a CRLF (\r\n) parameters Optional. Specifies an additional parameter to the sendmail program As soon as the mail function is called PHP will attempt to send the email then...
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PHP Sessions

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A PHP session variable is used to store information about, or change settings for a user session. Session variables hold information about one single user, and are available to all pages in one application.A session creates a file in a temporary directory on the server where registered session variables and their values are stored. This data will be available to all pages on the site during that visit. A session ends when the user loses the browser or after leaving the site, the server will terminate the session after a predetermined period of time, commonly 30 minutes duration. Starting a PHP Session: A PHP session is easily started by making a call to the session_start() function.This function first checks if a session is already started and if none is started then it starts one. It is recommended to put the call to session_start() at the beginning of the page. Session variables are stored in associative array called $_SESSION[]. These variables can be accessed during lifetime of a...
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PHP Cookies

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A cookie is often used to identify a user.A cookie is a tiny little file on your client’s hard drive which contains data you have asked to be stored. Some clients specifically configure their browser to reject cookies, believing for one reason or another that they are malicious, and there is nothing you can do about this – that person’s browser will not be able to store your data. When creating cookies, you specify how long you want it to be valid for, and, once done, the cookie remains in place until that date, when it “expires”. Cookies are automatically sent to the web server (and received/parsed by PHP) each time a user visits you. That means that once we place our cookie, our visitors’ browsers will automatically send the contents of that cookie across to us each time they view our messageboard index, and PHP will read the value into the $_COOKIE superglobal array. As cookies are sent each time, it is incredibly important not to store too much information there – they can real...
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