Eg: for alert pop up box: <html> <head> <script type = "text/javascript"> function myfun() { alert("virtual memory is low") } </script> </head> <body> <input type = "button" value = "Display" onclick = myfun()> </body> </html> Output: Virtual Memory is Low
Eg: for Confirm Box <html> <head> <script type = "text/javascript"> function myfun() { confirm("Do you want to restart your computer") } </script> </head> <body> <input type = "button" value = "Display" onclick = myfun()> </body> </html> Output: Do you want to restart your computer
Eg:To pass a value to java script function: <html> <head> <script type = "text/javascript"> function display(txt) { alert(txt) } </script> </head> <body> <input type = "button" value = "Morning" onclick = "display(Good Morning)"> <input type = "button" value = "Evening" onclick = "display(Good Evening)"> </body> </head> </html>
document.write(): It is a java script command, it will display the given value on web page.
Here, document is a pre-defined object & write is a pre-defined method. Write method will print the given value on web page.
Eg: for returning a value from Java script function <html> <head> <script type = "text/javascript"> function add(a,b) { return a+b } </script> </head> <body> <script type = "text/javascript"> document.write(add(10,5)) </script> </body> </html> Output: 15
