I'm familar with Zoho CRM Webforms but as far as I know, webforms can only create a new record in our CRM database.

QUESTION :

Is there a method in which a webform can UPDATE a record in zoho CRM ( given I have the record ID ) ?

Can I modify my form code to update an existing record?  

I refer to my SQL and PHP experience where I'd just send an UPDATE to the database.

If this is not the right approach, please point me in the right direction. 

.... or is this just not possible ?

Here is a basic webform code :

2. 
   
3. <div id='crmWebToEntityForm' style='width:600px;margin:auto;'>
4.    <META HTTP-EQUIV ='content-type' CONTENT='text/html;charset=UTF-8'>
5.    <form action='https://crm.zoho.com/crm/WebForm'  name=WebForm############ method='POST' onSubmit='javascript:document.charset="UTF-8"; return checkMandatory()' accept-charset='UTF-8'>
6. 
   
7. <!-- Do not remove this code. -->
8. <input type='text' style='display:none;' name='xnQsjsdp' value='#####'/>
9. <input type='hidden' name='zc_gad' id='zc_gad' value=''/>
10. <input type='text' style='display:none;' name='xmIwtLD' value='#########'/>
11. <input type='text' style='display:none;'  name='actionType' value='Q3VzdG9tTW9kdWxlNQ=='/>
12. 
    
13. <input type='text' style='display:none;' name='returnURL' value='returnlink;' /> 
14. <!-- Do not remove this code. -->
15. <style>
16. tr , td { 
17. padding:6px;
18. border-spacing:0px;
19. border-width:0px;
20. }
21. </style>
22. <table style='width:600px;background-color:#000000;color:#417342'>
23. 
    
24. <tr><td colspan='2' style='text-align:left;color:#417342;font-family:Arial;font-size:18px;'><strong> Form</strong></td></tr>
25. 
    
26. 
    
27. 
    
28. 
    
29. <tr><td  style='nowrap:nowrap;text-align:right;font-size:16px;font-family:Arial;width:200px;'>Name</td><td style='width:250px;' ><input type='text' style='width:250px;'  maxlength='255' name='COBJ5CF162' /></td></tr>
30. 
    
31. 
    
32. 
    
33. <script>
34.  
35. 
    
36.    function checkMandatory() {
37. for(i=0;i<mndFileds.length;i++) {
38.  var fieldObj=document.forms['WebForm1338246000004338027'][mndFileds[i]];
39.  if(fieldObj) {
40. if (((fieldObj.value).replace(/^\s+|\s+$/g, '')).length==0) {
41. if(fieldObj.type =='file')
42. { 
43. alert('Please select a file to upload.'); 
44. fieldObj.focus(); 
45. return false;
46. } 
47. alert(fldLangVal[i] +' cannot be empty.'); 
48.          fieldObj.focus();
49.          return false;
50. }  else if(fieldObj.nodeName=='SELECT') {
51.       if(fieldObj.options[fieldObj.selectedIndex].value=='-None-') {
52. alert(fldLangVal[i] +' cannot be none.'); 
53. fieldObj.focus();
54. return false;
55.   }
56. } else if(fieldObj.type =='checkbox'){
57.   if(fieldObj.checked == false){
58. alert('Please accept  '+fldLangVal[i]);
59. fieldObj.focus();
60. return false;
61.   } 
62. } 
63. try {
64.     if(fieldObj.name == 'Last Name') {
65. name = fieldObj.value;
66.      }
67. } catch (e) {}
68.    }
69. }
70.     }
71.   
72. </script>
73. </form>
74. </div>

Thanks,

Aaron