Function calling in js
Download as PPTX, PDF1 like647 views
This document discusses JavaScript functions. It defines a function as a block of code that is executed when called. Functions can take arguments and return values. Examples are provided to demonstrate defining functions, calling functions, passing arguments to functions, and functions that return values. The document also provides contact information for Baabtra-Mentoring Partner.
Function calling in js
- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 3. Function calling using java script SWALIH T swalihk321@gmail.com www.facebook/ swalih321 twitter.com/swalih321 in.linkedin.com/in/swalih321 9539353663
- 4. Function • A function is a block of code that will be executed when "someone" calls it: • A function is written as a code block (inside curly { } braces), preceded by the function keyword: • The function can be called directly when an event occurs (like when a user clicks a button), and it can be called from "anywhere" by JavaScript code.
- 5. Example <html> <head> <script type="text/javascript"> <!-- function popup() { alert("Hello World") } //--> </script> </head> <body> <input type="button" onclick="popup()" value="Enter"> </body> </html>
- 6. With Arguments • When you call a function, you can pass along some values to it, these values are called arguments or parameters. • These arguments can be used inside the function. You can send as many arguments as you like, separated by commas (,)
- 7. Example<html> <body> <p>Click the button to call a function with arguments</p> <button onclick="myFunction('Swalih','Mukkam')">Try it</button> <script> function myFunction(name,place) { alert("Welcome " + name + ", are you in " + place); } </script> </body> </html>
- 8. Functions With a Return Value • Sometimes you want your function to return a value back to where the call was made. • This is possible by using the return statement. • When using the return statement, the function will stop executing, and return the specified value.
- 9. Example <html> <body> <p>This example calls a function which performs a calculation, and returns the result:</p> <p id="demo"></p> <script> function myFunction(a,b) { return a*b; } document.getElementById("demo").innerHTML=myFunction(4,3); </script> </body> </html>
- 10. If this presentation helped you, please visit our page facebook.com/baabtra and like it. Thanks in advance. www.baabtra.com | www.massbaab.com |www.baabte.com
- 11. Contact Us Emarald Mall (Big Bazar Building) Mavoor Road, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550 NC Complex, Near Bus Stand Mukkam, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550 Start up Village Eranakulam, Kerala, India. Email: info@baabtra.com