Question

Javascript function not running

Asked by: Max_AJApplegarth

I have created the following code that is supposed to bring back if what I have input is a letter in the alphabet or not. However I can't get it to run to be able to input any characters, any help, pointers would be grateful. Thanks in advance

//Script to find letter of the alphabet
//It runs with no errors on page but I can't get an input box to
//come up.
            function isInAlphabet (theCharacter) {
                  if ((theCharacter = 'A') || (theCharacter = 'z')) {
                        theAnswer = true;
                  } else {
                        theAnswer = false;
                  }
                  return theAnswer;
            }
// This code is to enter a character to find if it is a letter of
// The alphabet or not
                  function alphabetCheck () {
                  var someInput;
                  var aResult;
                  someInput = window.prompt('Please enter a single character ','');
                  aResult = inAlphabet();
                  document.open();
                  document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + aResult);
                  document.close();
            }

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Asked On
2005-06-15 at 11:26:52ID21459338
Tags

javascript

Topic

JavaScript

Participating Experts
4
Points
250
Comments
10

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Answers

 

by: ZvonkoPosted on 2005-06-15 at 11:29:12ID: 14224361

You do not pass the character as parameter:

      aResult = inAlphabet(someInput);


 

by: ndixonPosted on 2005-06-15 at 11:29:26ID: 14224364


//Script to find letter of the alphabet
//It runs with no errors on page but I can't get an input box to
//come up.
          function isInAlphabet (theCharacter) {
               if ((theCharacter = 'A') || (theCharacter = 'z')) {
                    theAnswer = true;
               } else {
                    theAnswer = false;
               }
               return theAnswer;
          }
// This code is to enter a character to find if it is a letter of
// The alphabet or not
               function alphabetCheck () {
               var someInput;
               var aResult;
               someInput = window.prompt('Please enter a single character ','');
   // you need to pass a character to your function for checking, of course the prompt will allow more than a single character
               aResult = inAlphabet(someInput);

               document.open();
               document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + aResult);
               document.close();
          }

 

by: archrajanPosted on 2005-06-15 at 11:31:13ID: 14224382

here u go:
//Script to find letter of the alphabet
//It runs with no errors on page but I can't get an input box to
//come up.
          function isInAlphabet (theCharacter) {
               if ((theCharacter = 'A') || (theCharacter = 'z')) {
                    theAnswer = true;
               } else {
                    theAnswer = false;
               }
                     alert(theAnswer);
               return theAnswer;
          }
// This code is to enter a character to find if it is a letter of
// The alphabet or not
               function alphabetCheck () {
               var someInput;
               var aResult;
               someInput = window.prompt('Please enter a single character ','');
              var aResult = isInAlphabet();
               document.open();
               document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + aResult);
               document.close();

              }

 

by: archrajanPosted on 2005-06-15 at 11:32:11ID: 14224393

u have the function name as
function isInAlphabet (theCharacter)


but calling it like
aResult = inAlphabet();

it shud be
aResult = isInAlphabet();

 

by: ZvonkoPosted on 2005-06-15 at 11:32:22ID: 14224399

Also you can use a RegExp object to check the alphabet:

         function alphabetCheck () {
              var someInput;
              var aResult;
              someInput = window.prompt('Please enter a single character ','');
              aResult = (someInput.match(/^[a-z]+$/i)!=null);
              document.open();
              document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + aResult);
              document.close();
         }

 

by: Max_AJApplegarthPosted on 2005-06-15 at 11:41:53ID: 14224503

Thanks for your help, is there any reason why it is still not bringing up a prompt for the character, the version of IE I have is 6
it won't run in this or Netscape. Cheers

 

by: archrajanPosted on 2005-06-15 at 11:49:14ID: 14224574

how r u calling the function?

 

by: Max_AJApplegarthPosted on 2005-06-15 at 12:06:57ID: 14224762

Sorry to be apain but I'm still having trouble with bringing anything other than a blank screen up, I have put this into all Javascript editors I have and they all report back with no errors but a blank page. I have put my full code below now so you can see if I am doing anything wrong. Cheers

<html>
<head>
<title>M150 TMA question for Unit 10</title>

<script
            language="JavaScript"
            type="text/javascript">

             function isInAlphabet (theCharacter) {
               if ((theCharacter = 'A') || (theCharacter = 'z')) {
                    theAnswer = true;
               } else {
                    theAnswer = false;
               }
                  alert(theAnswer);
               return theAnswer;
          }

               function alphabetCheck () {
               var someInput;
               var aResult;
               someInput = window.prompt('Please enter a single character ','');
              var aResult = isInAlphabet();
               document.open();
               document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + aResult);
               document.close();

            }
</script>
</head>

<body>

</body>
</html>

 

by: archrajanPosted on 2005-06-15 at 12:11:58ID: 14224825

see here:
<html>
<head>
<title>M150 TMA question for Unit 10</title>

<script language="JavaScript" type="text/javascript">

           function isInAlphabet (theCharacter) {
               if ((theCharacter = 'A') || (theCharacter = 'z')) {
                    theAnswer = true;
               } else {
                    theAnswer = false;
               }
                  alert(theAnswer);
               return theAnswer;
          }

               function alphabetCheck () {
               var someInput;
               var aResult;
               someInput = window.prompt('Please enter a single character ','');
              var aResult = isInAlphabet();
               document.open();
               document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + aResult);
               document.close();

            }
                  alphabetCheck(); // remove this line if u do not want to call the function when the page loads

</script>
</head>

<body>
<input type = "button" value = "clickme" onclick = "alphabetCheck();"><!-- remove this line if u do not want to call the
function onclick of a button -->
</body>
</html>

 

by: jonnalPosted on 2005-06-15 at 15:25:00ID: 14226572

hi
((theCharacter = 'A')  is an asignment not a test

and you need to pass the parameter someInput
var aResult = isInAlphabet(someInput );

<html>
<head>
<title>M150 TMA question for Unit 10</title>

<script language="JavaScript" type="text/javascript">

           function isInAlphabet (theCharacter) {

               if ((theCharacter >= 'A' && theCharacter <= 'Z') ||  (theCharacter >= 'a' && theCharacter <= 'z')) {
                    theAnswer = true;
               } else {
                    theAnswer = false;
               }
                  alert(theAnswer);
               return theAnswer;
          }

               function alphabetCheck () {
               var someInput;
               var aResult;
               someInput = window.prompt('Please enter a single character ','');
              var aResult = isInAlphabet(someInput );
               document.open();
               document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + aResult);
               document.close();

            }
               alphabetCheck(); // remove this line if u do not want to call the function when the page loads

</script>
</head>

<body>
<input type = "button" value = "clickme" onclick = "alphabetCheck();"><!-- remove this line if u do not want to call the
function onclick of a button -->
</body>
</html>



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