Page 311 - Web Applications (803) Class 11
P. 311

Ð ÐAfter hitting the OK button, the prompt( ) method returns the value. It returns the input value if it is entered;
                   otherwise, if the user clicks the Cancel button, it returns null.
                 Example:
                   <HTML>
                   <HEAD>
                   <TITLE>Using prompt box</TITLE>
                   </HEAD>
                   <BODY>
                   <script type = "text/javascript">
                   var age=prompt("Enter Age”, "18");
                   if (age == null || age == " ") // If user clicks the Cancel button
                   {
                   alert("No input received");
                   }
                   else if(age < 18)
                   {
                   alert("You can get a learner's licence only");
                   }
                   else
                   {
                   alert("You can get a driver's licence");
                   }
                   </SCRIPT>
                   </BODY>
                   </HTML>
                 Output:


















                 When you click on the “OK” button, with the message “this page says”. Then a new window opens with the message
                 “You can get a driver’s licence”.



















                                                                      Introduction to Dynamic Websites Using JavaScript  309
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