mortgage calculator problems

**chqdznr** · 08-02-2006, 11:36 AM

Hi all,

I am trying to modify a mortgage calculator script that I found at: http://www.1stop-mortgagecalculator....culator-Script.

I'm new to js and I need my result "monthly_payment" to display on the form in a text box. Can anyone tell me how to do it? A colleague suggested to put it in a div tag and use .InnerHtml, however, I don't know how to do that and I am unfamiliar with the .innerHtml property(?)

Here is my code:
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Mortgage calculator</title>
</head>

<body>

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

</script>

<form name="formpage">
<table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="478">
<tbody>
<tr valign="top">
<td width="183">Amount to be financed:<br /></td>
<td width="183"><input name="principal" size="7" maxlength="12" type="text"><br /><br /></td>
</tr>

<tr valign="top">
<td>Current fixed rate:  <br /><br /></td>
<td>8.80%*<input name="interest" size="5" value="8.80" type="hidden"><br /><br /></td>
</tr>

<tr valign="top">
<td>Years financed:  <br /><br /></td>
<td><select name="term" id="years">
<option value=""></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7" selected="selected">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select><br /><br /></td>
</tr>

<tr valign="top">
<td colspan="2" height="39">
<input src="images/btn_calculate.gif" onclick="find_payment(PR, IN, PE)" alt="calculate payment" type="image" width="83" height="16">
<img src="images/spacer.gif" border="0" height="16" width="3">
<a href="jstest.htm"><img src="images/btn_clear.gif" alt="close window" border="0" height="16" width="59"></a> <br />
 </td>
</tr>

<tr valign="top">
<td colspan="2" class="footnote">
<p> * Valid as of June 1, 2006
<input name="txtDate_Last_Updated" size="5" value="2/1/2006" type="hidden">
</p> </td>
</tr>
</tbody>
</table>

</form>
</body>

</html>

All,

I keep getting an error: "document.formpage.principal is null or not an object". I am very confused. Can any one help me out?

THANKS, I appreciate it!!!

**jalarie** · 08-02-2006, 12:54 PM

Add a field to hold the output:

Code:

  <input type="text" id="result">

In the script in place of the document.write, put in code to display the result in the above field:

Code:

  document.forms[0].result.value=monthly_payment;

**chqdznr** · 09-07-2006, 11:33 AM

Thanks very much jalarie. I didn't know anyone replied. I'll post the solution I used as soon as I find it.

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