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Q: Why doesn't the "C" key work on this java calculator? ( Answered,   0 Comments )
Question  
Subject: Why doesn't the "C" key work on this java calculator?
Category: Computers > Algorithms
Asked by: lampware-ga
List Price: $2.00
Posted: 10 Sep 2004 20:30 PDT
Expires: 10 Oct 2004 20:30 PDT
Question ID: 399617
<html>
 <head>
  <title>
   Java Simple Calculator
  </title>
  <style>
   body, tr, td, input: {font-family:Fixed; color:blue}
  </style>
  <script language="JavaScript">
   <!--
    string="";
 
    function app( cc )
    {
      string += cc;
      document.form1.text1.value = string;
    }
 
    function clear( )
    {
      string = "";
      document.form1.text1.value = string;
    }
 
    function calc( )
    {
      if( string.length > 0 )
      {
        inp = "out=" + string;
        eval( inp );
      }
      else
        out = "0";
 
      document.form1.text1.value = out;
      string = "" + out;
    }
 
    function upda( )
    {
      string = "" + document.form1.text1.value;
    }
   //-->
  </script>
 </head>
 <body onLoad="clear()">
  <form name="form1" method="POST" onSubmit="{upda(); calc(); return false;}">
   <table border>
    <tr>
     <td colspan=5>
      <input type="text" style="font-family:Courier" size=18
maxlength=80 name="text1" value="" onChange="upda()">
     </td>
    </tr>
    <tr>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 7 "
onClick="app('7')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 8 "
onClick="app('8')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 9 "
onClick="app('9')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" / "
onClick="app('/')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" C "
onClick="clear()">
     </td>
    </tr>
    <tr>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 4 "
onClick="app('4')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 5 "
onClick="app('5')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 6 "
onClick="app('6')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" * "
onClick="app('*')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" ( "
onClick="app('(')">
     </td>
    </tr>
    <tr>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 1 "
onClick="app('1')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 2 "
onClick="app('2')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 3 "
onClick="app('3')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" - "
onClick="app('-')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" ) "
onClick="app(')')">
     </td>
    </tr>
    <tr>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" 0 "
onClick="app('0')">
     </td>
     <td>
      &nbsp;
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" . "
onClick="app('.')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" + "
onClick="app('+')">
     </td>
     <td align=center>
      <input type="button" style="font-family:Courier" value=" = "
onClick="calc()">
     </td>
    </tr>
   </table>
  </form>
 <body>
</html>
Answer  
Subject: Re: Why doesn't the "C" key work on this java calculator?
Answered By: googleexpert-ga on 10 Sep 2004 21:03 PDT
 
Hi,
There seems to be a function name conflict between your "clear()" and 
Javascript's "clear()"

If you change your function "clear()" to something else like "fieldclear()",
it your calculator should work.

Reference:
http://www.mozilla.org/docs/dom/domref/dom_doc_ref42.html

Please let me know if you have anymore questions.
-googleexpert
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