How would I make an if else function do this?

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#1 mmpabc  Icon User is offline

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How would I make an if else function do this?

Posted 25 April 2012 - 08:14 PM

how would I make an if else function do this? I am new to Java and have no clue. All I know is I am supposed to use if else statements

Make one function
On each of the selection boxes, when a change occurs, use the onchange
event handler to call a function.

Inside that function
if a hand tool is selected and a power tool is selected, calculate the costs
else if a hand tool is selected and a power tool is not selected,
calculate the costs
else if a hand tool is not selected and a power tool is selected,
calculate the costs
if no hand tool is selected and no power tool is selected, zero out the field

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#2 pbl  Icon User is offline

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Re: How would I make an if else function do this?

Posted 25 April 2012 - 08:21 PM

You need a GUI for that with JCheckBox

By one fuction your teacher surely means only one actionPerformed

class MyPanel extends JPanel implements ActionListener {

   JCheckBox a,b,c,d;

   // constructor
   MyPanel() {
      a = new JCheckBox("Hammer");
      a.addActionListener(this);
      add(a);
...
   }

   public void actionPerformed(ActionEvent e) {
       // a checkbox has been changed
       // check the status of all of them and build invoice accordingly
   }

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Re: How would I make an if else function do this?

Posted 25 April 2012 - 08:27 PM

This is what I have been able to do so far but only one of the dropdown menus works. I dont understand why the other one won't work
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>
      Mumal Ahmed 
    </title>    
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <meta http-equiv="content-language" content="en-us" />

 <!-- This is where your link tag goes when linking to an external style sheet. -->
 
<!--This is the format you will use when entering Javascript -->    
<script type="text/javascript">
/* <![CDATA[ */

 window.onload=function() {  
  if (document.getElementById) { 
 document.getElementById("selection").onchange=function() { switchme(this); }  
  } 
 } 
 function switchme(SNewSel) { 
 var ind = SNewSel.selectedIndex; 
 var txt = document.getElementById('TextField1'); 
 var txt2 = document.getElementById('TextField2');
 var txt3 = document.getElementById('TextField3');
 var txt4 = document.getElementById('TextField4');
 switch (ind) { 
  case 1: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
  case 2: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
  case 3: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
  case 3: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
   case 4: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
   case 5: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
       case 6: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break;
  default: 
 txt.value='$20'; 
 } 
} 


/* ]]> */
</script>    
    
</head>

  <body> 
 <div> 
<!-- Your XHTML here -->
  
<h1>Purchase Order</h1>
<form action="FormProcessor.html" name="contact_form" method="get" enctype="application/x-www-form-urlencoded" onsubmit="return confirmSubmit();" onreset="return confirmReset();">    
<h3>Products</h3>
<table>
<tr>
  <td>  
<p>Hand Tools <br />$20.00</p>
  </td>
  <td>
  <select name="hand_tool" size="1" id="selection">
      <option value="1">Hand Tool</option>
      <option value="2">Saw</option>
      <option value="3">Hammer</option>
      <option value="4">Screwdriver</option>
      <option value="5">Wrench</option>
      <option value="6">Pliers</option>
      </select>
  </td>
  <td>
  <p>Power Tools <br />$30.00</p>
  </td>
  <td>      
  <select name="power_tool" size="1" id="select">
      <option value="7">Power Tool</option>
      <option value="8">Circular Saw</option>
      <option value="9">Sabre Saw</option>
      <option value="10">Drill</option>
      <option value="11">Belt Sander</option>
      <option value="12">Table Saw</option>
    </select>
  </td> 
</tr>
</table>
  
<h3>Shipping Fees</h3>
<table>
  <tr>
  <td>Item 1: <input id="TextField1" type="text" name="TextField1" value="" /></td>
  <td>Item 2: <input id="TextField2" type="text" name="TextField2" value="" /></td>
  </tr>
  <tr>
  <td>Shipping: <input id="TextField3" type="text" name="shipping" value="" /></td>
  <td>Total: <input id="TextField4" type="text" name="total" value="" /></td>
  </tr> 
</table> 
<h3>Customer Information</h3>
  <p>First Name
    <input type="text" name="first_name" value="FirstName" onclick="document.forms[0].first_name.value = '';" onchange="confirmSubmit();"/>  
  Last Name
    <input type="text" name="last_name" value="LastName" onclick="document.forms[0].last_name.value = '';" onchange="confirmSubmit();" /></p>
  <p>Street Address 1 
    <input type="text" name="address1" value="Address1" onclick="document.forms[0].address1.value = '';" onchange="confirmSubmit();" /></p>
  <p>City 
    <input type="text" name="city" value="City" onclick="document.forms[0].city.value = '';" onchange="confirmSubmit();" />
  State 
    <input type="text" name="state" value="State" onclick="document.forms[0].state.value = '';" onchange="confirmSubmit();" />
  Zip 
    <input type="text" name="zip" value="Zip" onchange="return checkForNumber(this.value);" onclick="document.forms[0].zip.value = '';" /></p>
  <p>Phone
    <input type="text" name="phone" value="Phone" onchange="return checkForNumber(this.value);" onclick="document.forms[0].phone.value = '';" />
  Fax
    <input type="text" name="fax" value="Fax" onclick="document.forms[0].fax.value = '';" onchange="return checkForNumber(this.value);" /></p>
  
  <p>Payment Method? 
  <input type="radio" name="credit_card" />Visa
  
  <input type="radio" name="credit_card" />MasterCard
  
  <input type="radio" name="credit_card" />American Express</p>
  <p>Credit Card Number<input type="text" name="cardNumber" value="CardNumber" size="50" onclick="document.forms[0].cardNumber.value = '';" onchange="return checkForNumber(this.value);" /></p>

<table>
<tr>
  <td>  
<p>Expiration Month</p>
  </td>
  <td>
  <select name="month" size="1" style="width: 200px">
      <option value="months">Month</option>
      <option value="january">January </option>
      <option value="february">February</option>
      <option value="march">March</option>
      <option value="april">April</option>
      <option value="may">May</option>
      <option value="june">June</option>
      <option value="july">July</option>
      <option value="august">August</option>
      <option value="september">September</option>
      <option value="october">October</option>
      <option value="november">November</option>
      <option value="december">December</option>
      </select>
  </td>
  <td>
  
  <p>Expiration Year</p>
  </td>
  <td>      
  <select name="expiration" size="1">
      <option value="2009">2012</option>
      <option value="2010">2013</option>
      <option value="2011">2014</option>
      <option value="2012">2015</option>
      <option value="2013">2016</option>
      <option value="2014">2017</option>
    </select>
  </td> 
</tr>
</table>

<p><input type="image" alt="image of a submit button" src="submitButton.gif" onchange="confirmSubmit()" /></p>
<p><input type="reset" value="Reset Form" src="resetButton.gif" onchange="confirmReset();" /></p>    
</form>    



<!-- your XHTML validation icon-->  
<p>
    <a href="http://validator.w3.org/check?uri=referer"><img
        src="http://www.w3.org/Icons/valid-xhtml10"
        alt="Valid XHTML 1.0 Strict" height="31" width="88" 
        style="border: 0px;" /></a>
    <a href="http://jigsaw.w3.org/css-validator/check/referer">
    <img src="http://www.austincc.edu/jscholl/images/vcss.png" 
    alt="Valid CSS!" height="31" width="88" style="border: 0px;" /></a>       
</p>
</div>
  </body>
  </html>

View Postpbl, on 25 April 2012 - 08:21 PM, said:

You need a GUI for that with JCheckBox

By one fuction your teacher surely means only one actionPerformed

class MyPanel extends JPanel implements ActionListener {

   JCheckBox a,b,c,d;

   // constructor
   MyPanel() {
      a = new JCheckBox("Hammer");
      a.addActionListener(this);
      add(a);
...
   }

   public void actionPerformed(ActionEvent e) {
       // a checkbox has been changed
       // check the status of all of them and build invoice accordingly
   }

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#4 pbl  Icon User is offline

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Re: How would I make an if else function do this?

Posted 25 April 2012 - 09:25 PM

This code is JavaScrip, I think, you are here in the Java forum
beside the first 4 letters, these two has nothing in common :)
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#5 mmpabc  Icon User is offline

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Re: How would I make an if else function do this?

Posted 25 April 2012 - 09:29 PM

my bad...sorry

View Postpbl, on 25 April 2012 - 09:25 PM, said:

This code is JavaScrip, I think, you are here in the Java forum
beside the first 4 letters, these two has nothing in common :)

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#6 mmpabc  Icon User is offline

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Re: How would I make an if else function do this?

Posted 25 April 2012 - 09:31 PM

how would I make an if else function do this? I am supposed to use if else statements

Make one function
On each of the selection boxes, when a change occurs, use the onchange
event handler to call a function.

Inside that function
if a hand tool is selected and a power tool is selected, calculate the costs
else if a hand tool is selected and a power tool is not selected,
calculate the costs
else if a hand tool is not selected and a power tool is selected,
calculate the costs

This is what I have so far but only 1 dropdown menu works and I cant figure out why.

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>
 
    </title>    
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <meta http-equiv="content-language" content="en-us" />

 <!-- This is where your link tag goes when linking to an external style sheet. -->
 
<!--This is the format you will use when entering Javascript -->    
<script type="text/javascript">
/* <![CDATA[ */

 window.onload=function() {  
  if (document.getElementById) { 
 document.getElementById("selection").onchange=function() { switchme(this); }  
  } 
 } 
 function switchme(SNewSel) { 
 var ind = SNewSel.selectedIndex; 
 var txt = document.getElementById('TextField1'); 
 var txt2 = document.getElementById('TextField2');
 var txt3 = document.getElementById('TextField3');
 var txt4 = document.getElementById('TextField4');
 switch (ind) { 
  case 1: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
  case 2: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
  case 3: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
  case 3: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
   case 4: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break; 
   case 5: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
       case 6: // hand tool 
  txt.value = "$20"; 
   txt2.value = "$0"; 
    txt3.value = "$5"; 
     txt4.value = "$25"; 
 break;
  default: 
 txt.value='$20'; 
 } 
} 


/* ]]> */
</script>    
    
</head>

  <body> 
 <div> 

  
<h1>Purchase Order</h1>
<form action="FormProcessor.html" name="contact_form" method="get" enctype="application/x-www-form-urlencoded" onsubmit="return confirmSubmit();" onreset="return confirmReset();">    
<h3>Products</h3>
<table>
<tr>
  <td>  
<p>Hand Tools <br />$20.00</p>
  </td>
  <td>
  <select name="hand_tool" size="1" id="selection">
      <option value="1">Hand Tool</option>
      <option value="2">Saw</option>
      <option value="3">Hammer</option>
      <option value="4">Screwdriver</option>
      <option value="5">Wrench</option>
      <option value="6">Pliers</option>
      </select>
  </td>
  <td>
  <p>Power Tools <br />$30.00</p>
  </td>
  <td>      
  <select name="power_tool" size="1" id="select">
      <option value="7">Power Tool</option>
      <option value="8">Circular Saw</option>
      <option value="9">Sabre Saw</option>
      <option value="10">Drill</option>
      <option value="11">Belt Sander</option>
      <option value="12">Table Saw</option>
    </select>
  </td> 
</tr>
</table>
  
<h3>Shipping Fees</h3>
<table>
  <tr>
  <td>Item 1: <input id="TextField1" type="text" name="TextField1" value="" /></td>
  <td>Item 2: <input id="TextField2" type="text" name="TextField2" value="" /></td>
  </tr>
  <tr>
  <td>Shipping: <input id="TextField3" type="text" name="shipping" value="" /></td>
  <td>Total: <input id="TextField4" type="text" name="total" value="" /></td>
  </tr> 
</table> 
<h3>Customer Information</h3>
  <p>First Name
    <input type="text" name="first_name" value="FirstName" onclick="document.forms[0].first_name.value = '';" onchange="confirmSubmit();"/>  
  Last Name
    <input type="text" name="last_name" value="LastName" onclick="document.forms[0].last_name.value = '';" onchange="confirmSubmit();" /></p>
  <p>Street Address 1 
    <input type="text" name="address1" value="Address1" onclick="document.forms[0].address1.value = '';" onchange="confirmSubmit();" /></p>
  <p>City 
    <input type="text" name="city" value="City" onclick="document.forms[0].city.value = '';" onchange="confirmSubmit();" />
  State 
    <input type="text" name="state" value="State" onclick="document.forms[0].state.value = '';" onchange="confirmSubmit();" />
  Zip 
    <input type="text" name="zip" value="Zip" onchange="return checkForNumber(this.value);" onclick="document.forms[0].zip.value = '';" /></p>
  <p>Phone
    <input type="text" name="phone" value="Phone" onchange="return checkForNumber(this.value);" onclick="document.forms[0].phone.value = '';" />
  Fax
    <input type="text" name="fax" value="Fax" onclick="document.forms[0].fax.value = '';" onchange="return checkForNumber(this.value);" /></p>
  
  <p>Payment Method? 
  <input type="radio" name="credit_card" />Visa
  
  <input type="radio" name="credit_card" />MasterCard
  
  <input type="radio" name="credit_card" />American Express</p>
  <p>Credit Card Number<input type="text" name="cardNumber" value="CardNumber" size="50" onclick="document.forms[0].cardNumber.value = '';" onchange="return checkForNumber(this.value);" /></p>

<table>
<tr>
  <td>  
<p>Expiration Month</p>
  </td>
  <td>
  <select name="month" size="1" style="width: 200px">
      <option value="months">Month</option>
      <option value="january">January </option>
      <option value="february">February</option>
      <option value="march">March</option>
      <option value="april">April</option>
      <option value="may">May</option>
      <option value="june">June</option>
      <option value="july">July</option>
      <option value="august">August</option>
      <option value="september">September</option>
      <option value="october">October</option>
      <option value="november">November</option>
      <option value="december">December</option>
      </select>
  </td>
  <td>
  
  <p>Expiration Year</p>
  </td>
  <td>      
  <select name="expiration" size="1">
      <option value="2009">2012</option>
      <option value="2010">2013</option>
      <option value="2011">2014</option>
      <option value="2012">2015</option>
      <option value="2013">2016</option>
      <option value="2014">2017</option>
    </select>
  </td> 
</tr>
</table>

<p><input type="image" alt="image of a submit button" src="submitButton.gif" onchange="confirmSubmit()" /></p>
<p><input type="reset" value="Reset Form" src="resetButton.gif" onchange="confirmReset();" /></p>    
</form>    



  </body>
  </html>

This post has been edited by Dormilich: 25 April 2012 - 11:36 PM
Reason for edit:: note: merged from a previous JS forum post

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