1.java script
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JavaScript is a lightweight programming language used to build interactive effects into web pages. It is interpreted rather than compiled, and is most commonly used on the client-side to manipulate web page content and interact with users. JavaScript code can be added directly via <script> tags or referenced externally. It allows for dynamic content, user feedback without page reloads, and richer interfaces. Limitations include a lack of file access from the client-side for security reasons and no multithreading capabilities. Basic form validation with JavaScript confirms required fields are completed and email addresses are properly formatted.
1.java script
- 2. Javascript JavaScript is a lightweight, interpreted programming language. It is designed for creating network-centric applications. It is complimentary to and integrated with Java. JavaScript is very easy to implement because it is integrated with HTML. It is open and cross-platform.
- 3. Client-side JavaScript Client-side JavaScript is the most common form of the language. The script should be included in or referenced by an HTML document for the code to be interpreted by the browser. Programs interact with the user, control the browser, and dynamically create HTML content.
- 4. Javascript Example <html> <body> <script language="javascript" type="text/javascript"> document.write("Hello World!") </script> </body> </html>
- 5. Advantages of JavaScript Less server interaction Immediate feedback to the visitors Increased interactivity Richer interfaces
- 6. Limitations of JavaScript Client-side JavaScript does not allow the reading or riting of files. Security reason. Cannot be used for networking applications, there is no such support available. Doesn't have any multithreading or multiprocessor capabilities.
- 7. JavaScript Exmple <html> <body onload = checkscope();> <script type = "text/javascript"> var myVar = "global"; // Declare a global variable function checkscope( ) { var myVar = "local"; // Declare a local variable document.write(myVar); } </script> </body> </html>
- 8. JavaScript Basic Form Validation if( document.myForm.EMail.value == “ “ ) { alert( "Please provide your Email!" ); document.myForm.EMail.focus(); return false; } Should writtern with html form
- 9. Email Validation function validateEmail() { var emailID = document.myForm.EMail.value; atpos = emailID.indexOf("@"); dotpos = emailID.lastIndexOf("."); if (atpos < 1 || ( dotpos - atpos < 2 )) { alert("Please enter correct email ID") document.myForm.EMail.focus(); return false; } return( true ); }