JavaScript: what is the function of "length" in this case?

**gilgalbiblewhee** · Mar 9th, 2005, 01:35 AM

Because the error says "null or not an object".

Code:

<!-- //
conv_tbl = [
  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,
  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,
  32,  33,8704, 1513,1505,  37,  83,8717,  65, 79,  8727, 1496,  44,8722,  58,  47,
  48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  46,  59,  60,  61,  62,  63,
  64, 1488, 1489, 1510, 1491, 69, 70, 1490, 1492, 73, 74, 1499, 1500, 1502, 1504, 1506,
  1508, 81, 1512, 1513, 1514, 85, 1493, 87, 1495, 1497, 90, 91, 92,  93, 94,  95,
  63, 97, 66, 1509, 68, 101, 102, 71, 72, 105, 106, 1498, 1500, 1501, 1503, 111,
  1507, 1511, 82, 8707, 84, 117, 118, 86, 88, 89, 1494, 123, 124, 125, 126,  63,
  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,
  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,
  63, 978,8242,8804,8260,8734, 402,9827,9830,9829,9824,8596,8592,8593,8594,8595,
  63, 177,8243,8805, 215,8733,8706,8729, 247,8800,8801,8776,8230,  63,  63,8629,
  8501,8465,8476,8472,8855,8853,8709,8745,8746,8835,8839,8836,8834,8838,8712,8713,
  8736,8711, 174, 169,8482,8719,8730,8901, 172,8743,8744,8660,8656,8657,8658,8659,
  9674,9001, 174, 169,8482,8721,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63,
  63,9002,8747,8992,  63,8993,  63,  63,  63,  63,  63,  63,  63,  63,  63,  63
];

function convert(mc, unic_textarea)
{
   unic = '';

   for (i = 0; i < mc.length; i++)
   {
      tbl_idx = mc.charCodeAt(i);
      code    = tbl_idx < conv_tbl.length ? conv_tbl[tbl_idx] : 63;
      unic    = unic + String.fromCharCode(code)
   }

   unic_textarea.value = unic;
}

function mc2unic()
{
   mc = document.conv_form.mc_code.value;
   convert(mc, document.conv_form.unic_area);
}

// -->

**DeadEyes** · Mar 9th, 2005, 04:06 AM

Is that the correct way to declare an array?
try
conv_tbl = new Array(63,63,63...);

**gilgalbiblewhee** · Mar 9th, 2005, 04:32 AM

This was the original coding:

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<title>Michigan-Claremont Hebrew Encoding to Unicode Converter</title>                                         
<script type="text/javascript" language="JavaScript1.3">
<!-- //
conv_tbl = [
63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,
63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,
32, 33,8704, 1513,1505, 37, 83,8717, 65, 79, 8727, 1496, 44,8722, 58, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 46, 59, 60, 61, 62, 63,
64, 1488, 1489, 1510, 1491, 69, 70, 1490, 1492, 73, 74, 1499, 1500, 1502, 1504, 1506,
1508, 81, 1512, 1513, 1514, 85, 1493, 87, 1495, 1497, 90, 91, 92, 93, 94, 95,
63, 97, 66, 1509, 68, 101, 102, 71, 72, 105, 106, 1498, 1500, 1501, 1503, 111,
1507, 1511, 82, 8707, 84, 117, 118, 86, 88, 89, 1494, 123, 124, 125, 126, 63,
63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,
63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,
63, 978,8242,8804,8260,8734, 402,9827,9830,9829,9824,8596,8592,8593,8594,8595,
63, 177,8243,8805, 215,8733,8706,8729, 247,8800,8801,8776,8230, 63, 63,8629,
8501,8465,8476,8472,8855,8853,8709,8745,8746,8835,8839,8836,8834,8838,8712,8713,
8736,8711, 174, 169,8482,8719,8730,8901, 172,8743,8744,8660,8656,8657,8658,8659,
9674,9001, 174, 169,8482,8721, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,
63,9002,8747,8992, 63,8993, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63
];

function convert(mc, unic_textarea, html_textarea)
{
unic = '';
html = '';
for (i = 0; i < mc.length; i++)
{
     tbl_idx = mc.charCodeAt(i);
     code    = tbl_idx < conv_tbl.length ? conv_tbl[tbl_idx] : 63;
     unic    = unic + String.fromCharCode(code);

     html    = html + '&#' + code + ';'
}
unic_textarea.value = unic;
html_textarea.value = html;
}
function mc2unic()
{
mc = document.conv_form.mc_code.value;
convert(mc, document.conv_form.unic_area, document.conv_form.html_area);
}
// -->
</script> 
<style type="TEXT/CSS">
<!--
.onLoad {
color:khaki;
background:black;
scrollbar-base-color:darkgrey;
}
.onMouseOver {
color:khaki;
background:black;
scrollbar-base-color:grey;
}
.onMouseOut {
color:khaki;
background:black;
scrollbar-base-color:grey;
}
//-->
</style>
</head>

<body bgcolor="black" text="khaki" link="yellow" vlink="white" alink="orange">
<!-- START HOME FREE HEADER CODE -->
</div>
</title>
<br>             
<!-- END HOME FREE HEADER CODE -->

<center>                         
<h1>Michigan-Claremont Hebrew Encoding to Unicode Converter</h1>
</center>

<form name="conv_form">                                                 
<center>
<table border=0 cellspacing=10 cellpadding=10 align=center>
<tr>
<td>
<center><b>Codes:</b></center><br>
<table border = 1 align=top cellspacing=2 cellpadding=2>
<tr>
<td align=center>
A = &#1488<br>
</td>
<td align=center>
M = &#1502<br>
</td>
</tr>
<tr>
<td align=center>
B = &#1489<br>
</td>
<td align=center>
n = &#1504<br>
</td>
</tr>
<tr>
<td align=center>
G = &#1490<br>
</td>
<td align=center>
N = &#1503<br>
</td>
</tr>
<tr>
<td align=center>
D = &#1491<br>
</td>
<td align=center>
$ = &#1505<br>
</td>
</tr>
<tr>
<td align=center>
H = &#1492<br>
</td>
<td align=center>
O = &#1506<br>
</td>
</tr>
<tr>
<td align=center>
V = &#1493<br>

</td>

<td align=center>

p = &#1508<br>

</td>

</tr>

<tr>

<td align=center>

Z = &#1494<br>

</td>

<td align=center>

P = &#1507<br>

</td>

</tr>

<tr>

<td align=center>

X = &#1495<br>

</td>

<td align=center>

c = &#1510<br>

</td>

</tr>

<tr>

<td align=center>

+ = &#1496<br>

</td>

<td align=center>

C = &#1509<br>

</td>

</tr>

<tr>

<td align=center>

Y = &#1497<br>

</td>

<td align=center>

q = &#1511<br>

</td>

</tr>

<tr>

<td align=center>

k = &#1499<br>

</td>

<td align=center>

R = &#82<br>

</td>

</tr>

<tr>

<td align=center>

K = &#1498<br>

</td>

<td align=center>

S = &#1513<br>

</td>

</tr>

<tr>

<td align=center>

L = &#1500<br>

</td>

<td align=center>

T = &#1514<br>

</td>

</tr>

<tr>

<td align=center>

m = &#1501<br>

</td>

<td align=center>

. = &#58<br>

</td>

</tr>

</table>

</td>

<td>

<h4>MC Codes</h4>

                 <textarea name="mc_code" rows="3" cols="64"

class="onLoad" onmouseover="this.className='onMouseOver'"

onmouseout="this.className='onMouseOut'"></textarea> <br>

 

<h4>Unicode</h4>

                 <textarea name="unic_area" rows="3" cols="64"

class="onLoad" onmouseover="this.className='onMouseOver'"

onmouseout="this.className='onMouseOut'"></textarea> <br>

<h4>HTML4.x</h4>

                 <textarea name="html_area" rows="3" cols="64"

class="onLoad" onmouseover="this.className='onMouseOver'"

onmouseout="this.className='onMouseOut'"></textarea> <br>

<br>

 

<center> <input name="convert" type="button" value="Convert" onclick="mc2unic()"></center>

 

</center></form></td></table></body></html>

But I had to change it to somehow make it fit for my database recordset. (I use ASP)

Here is the altered version of the javascript. I took out the 3rd textarea, which is html_area, and all the red sections. But it then gave the error:

Code:

<!-- //

conv_tbl = [

63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,

63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,

32, 33,8704, 1513,1505, 37, 83,8717, 65, 79, 8727, 1496, 44,8722, 58, 47,

48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 46, 59, 60, 61, 62, 63,

64, 1488, 1489, 1510, 1491, 69, 70, 1490, 1492, 73, 74, 1499, 1500, 1502, 1504, 1506,

1508, 81, 1512, 1513, 1514, 85, 1493, 87, 1495, 1497, 90, 91, 92, 93, 94, 95,

63, 97, 66, 1509, 68, 101, 102, 71, 72, 105, 106, 1498, 1500, 1501, 1503, 111,

1507, 1511, 82, 8707, 84, 117, 118, 86, 88, 89, 1494, 123, 124, 125, 126, 63,

63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,

63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,

63, 978,8242,8804,8260,8734, 402,9827,9830,9829,9824,8596,8592,8593,8594,8595,

63, 177,8243,8805, 215,8733,8706,8729, 247,8800,8801,8776,8230, 63, 63,8629,

8501,8465,8476,8472,8855,8853,8709,8745,8746,8835,8839,8836,8834,8838,8712,8713,

8736,8711, 174, 169,8482,8719,8730,8901, 172,8743,8744,8660,8656,8657,8658,8659,

9674,9001, 174, 169,8482,8721, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63,

63,9002,8747,8992, 63,8993, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63

];

 

function convert(mc, unic_textarea)

{

unic = '';

 

for (i = 0; i < mc.length; i++)

{

     tbl_idx = mc.charCodeAt(i);

     code    = tbl_idx < conv_tbl.length ? conv_tbl[tbl_idx] : 63;

     unic    = unic + String.fromCharCode(code)

}

 

unic_textarea.value = unic;

}

 

function mc2unic()

{

mc = document.conv_form.mc_code.value;

convert(mc, document.conv_form.unic_area);

}

 

// -->

**DeadEyes** · Mar 9th, 2005, 06:27 AM

after this line of code
mc = document.conv_form.mc_code.value;
try alert(mc); just to see if it contains anything.

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