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How to pass a parameter to a function that is called on an event?

Need help with Javascript!!! Please!!?

  • Someone, please help me! I have a Javascript homework assignment and I am very lost / stuck... My instructions are to "Write a page which displays a button, when the button is clicked, a javascript function will be called to process the button. It will first ask the user to enter the number of values to be processed by using window object's prompt method. The user will enter a number (ie. 3). Your program will use window object's alert method to alert the user about user's input." ** ^^ I have done this part, it's the next part that I really really need help with, I have been trying for the past week and am running out of time. In this part "Your script contains another two javascript functions which can compute square and cube functions of a value given as a parameter. Your program will loop 3 times, the final result will be a table that contains the results which output iteration number, the value entered, the square of the number and the cube of the number. *Note your program contains at least three javascript functions. One to process button click event, one for square function and the other to compute the cube function." Here is my code: <head> <script type="text/javascript"> function prompter() { var reply = prompt("Please Enter Number of Values for Process:", "") alert ( "Preparing to Enter " + reply + " Values for Process.") } </script> </head> <body> <input type="button" onclick="prompter()" value="Process Data Now!"> </body> ~ I don't understand how to loop; if you try my code the first part works no problem; how do I make the prompt box to prompt again after the value is entered? It needs to square the number then cube it... Please if you're good with javascript and are kind please help I have no idea where to get help anymore... Thank you!

  • Answer:

    <html> <head> <script type="text/javascript"> function prompter() { var reply = prompt("Please Enter Number of Values for Process:", "") alert( "Preparing to Enter " + reply + " Values for Process.") var num=new Array(reply); result='<table border="1"><tr> <td>Iterator</td> <td>Input value</td> <td>Square</td> <td>Cube</td></tr>'; for(a=0;a<reply;a++){ num[a]=prompt("Enter number "+a, ""); result+='<tr><td>' +a+'</td><td>' +num[a]+'</td><td>' +square(num[a]) +'</td><td>'+cube(num[a]) +'</td></tr>'; } result+='</table>'; document.getElementById( "output").innerHTML=result; } function square(inum){ return inum*inum; } function cube(inum){ return Math.pow(inum,3); } </script> </head> <body> <input type="button" onclick="prompter()" value="Process Data Now!"> <div id="output"></div> </body> </html>

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