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Javascript and signaturepad

Posted on 2013-05-21
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Last Modified: 2013-05-23
Trying to get web page to regenerate a signature pad signature (http://thomasjbradley.ca/lab/signature-pad/regenerate/) , getting the error:
Uncaught TypeError: Cannot read property 'getContext' of undefined

Full html page attached
problem.html
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Comment
Question by:freshgrill
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5 Comments
 
LVL 52

Expert Comment

by:Scott Fell, EE MVE
ID: 39188347
Can you please upload this to your server and post the link.  Chances are you just have a something missing.
0
 

Author Comment

by:freshgrill
ID: 39188817
0
 
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Accepted Solution

by:
Scott Fell,  EE MVE earned 500 total points
ID: 39188921
You had a few html errors.  Working sample.   http://jsbin.com/aridej/1/edit  I have had this project on my own radar and just about to implement myself.

Think about encrypting that signature either serverside or js https://code.google.com/p/crypto-js/


 <html>
 <head>
 <META HTTP-EQUIV="Content-Type" content="text/html; charset=iso-8859-1">

<link rel="icon" href="/images/favicon.ico" type="image/ico"/>
<meta name="viewport" content="width=480" />
<title> Order Page</title>


<link href="http://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,700italic,400,300,700,600" rel=stylesheet>
<script src="http://orders.freshgrillfoods.com/signature-pad/modernizr.custom.min.js"></script>
<link rel=stylesheet href="http://orders.freshgrillfoods.com/signature-pad/jquery.signaturepad.css">
<!--[if lt IE 9]><script src="/signature-pad/flashcanvas.js"></script><![endif]-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="http://orders.freshgrillfoods.com/signature-pad/jquery.signaturepad.min.js"></script>
  
<script>
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</script>
    </script> <script src="http://orders.freshgrillfoods.com//signature-pad/json2.min.js"></script>
<script>
   $(document).ready(function () {
    $('.sigPad').signaturePad({displayOnly:true}).regenerate(sig);
   
  
   
  });
  </script>

 </head>

<body > 
<table cellspacing=0 cellpadding=0 border=0 width="480" >
<tr><td colspan=99 ><img height=1 alt="" width=1></td></tr>
<tr><td colspan=99 bgcolor="#36c"><img height=1 alt="" width=1></td></tr>

<tr>
<td  colspan=99 bgcolor=#e5ecf9> 
<center><font size=+3  color=#FF0000><a href="/">Online Ordering</a> </font>
</center>
</td>
</tr>
<tr>
<td colspan=99>
<center>
<small>
&nbsp;&nbsp;
<a href="/index.pl?a=logout">Logout</a>
&nbsp;&nbsp;-                 
<a href="/index.pl?a=login">Login</a>
&nbsp;&nbsp;-                 
<a href="/index.pl?a=myaccount">My Account/Ordering</a>
</small> 
  </center>

</td>


</tr> 
<tr><td colspan=99 bgcolor="#36c"><img height=1 alt="" width=1></td></tr> 

  <tr><td>   <form method=post action="/index.pl" class=sigPad>
      <input type="hidden" name="a" value="printreceipt">
      <input type=hidden name=orderid id=orderid value="32">
      <input type="submit" value="Print Receipt">
      </form>
      </td>
      <td>   <form method=post action="/index.pl" class=sigPad>
      <input type="hidden" name="a" value="emailreceipt">
      <input type=hidden name=orderid id=orderid value="32">
      <input type="submit" value="Email Receipt">
      </form>
      </td>
      </tr>
<tr><td>Orderid</td><td colspan=99>32</td></tr>
<tr><td>Received</td><td colspan=99>2013-05-21 15:02:38.160</td></tr>
<tr><td>Received By:</td><td colspan=99>bob</td></tr>
<tr><td colspan=99><hr></td></tr>
<tr><td>6-77684-10148-6</td><td>FG Ham & Cheddar Super Tri </td><td>2</td><td>2.62</td><td>5.24</td></tr><tr><td>6-77684-10293-3</td><td>FG Protein Plate </td><td>2</td><td>3.33</td><td>6.66</td></tr><tr><td colspan=99><hr></td></tr><tr><td>&nbsp;</td><td>Ins Total</td><td>4</td><td>&nbsp;</td><td>11.90</td></tr><tr><td colspan=99><hr></td></tr><tr><td>6-77684-10149-3</td><td>FG Turkey & Cheddar Super Tri </td><td>2</td><td>2.62</td><td>-5.24</td></tr><tr><td colspan=99><hr></td></tr><tr><td>&nbsp;</td><td>Outs Total</td><td>-2</td><td>&nbsp;</td><td>-5.24</td></tr><tr><td colspan=99><hr></td></tr><tr><td>&nbsp;</td><td>Order Total</td><td>&nbsp;</td><td>&nbsp;</td><td>6.66</td></tr><tr><td colspan=99>
<hr> 
  <div class="sigPad signed">
  <div class="sigWrapper">
    <div class="typed">Sir John A. Macdonald</div>
     <canvas class="pad" width="200" height="55"></canvas>
  </div>
  <p>Sir John A. Macdonald<br>July 1, 1867</p>
</div>
</td></tr>




 <tr><td >&nbsp</td></tr>
   <tr><td bgcolor="#36c" colspan=99><img height=1 alt="" width=1></td></tr>
   <tr><td colspan=99 align=center bgcolor=#e5ecf9>&nbsp;</td></tr>
    <tr><td colspan=99 bgcolor=#e5ecf9>
 Elapsed Time: 0 
     </td></tr>
     <tr><td colspan=99 bgcolor=#e5ecf9>

     </td></tr>
      
         <tr><td colspan=99 align=center bgcolor=#e5ecf9>&nbsp;<br></td></tr>
          <tr><td bgcolor="#36c" colspan=99><img height=1 alt="" width=1></td></tr>
           </table>
            </body>
             </html>

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Author Comment

by:freshgrill
ID: 39188950
I am still getting the same issue, it "writes" out whatever the name in <div class="typed">Mickey Mouse</div> instead of recreating the signature assigned to  "var sig"

Am I still missing something?

Thanks,
output1.png
output2.png
0
 
LVL 52

Expert Comment

by:Scott Fell, EE MVE
ID: 39189380
Your table did not validate.  I made a simple table and it worked  http://jsbin.com/aridej/4/edit   It is important with js to make sure everything is valid or it gets messed up.

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