Following is list of Apex/Visualforce code samples listed on Salesforce Wiki. These are collections of pieces of code that you think will be useful to us (Salesforce community). These are typically small (a few pages of Apex, or Apex and a few Visualforce pages, or a trigger or two) and one-off.

If you want to instead create or join a collaborative coding project, check out Salesforce Code Share

• Dynamic Picklist using Visualforce
• Flex and Force.com
• InvalidPlickListValues
• Visualforce Sample – PDF Quotes and Email Templates
• Email Verify
• Phone Verify
• Lead Mass Change Status For PRM
• How To Deploy A Trigger To Production – Contact Update Trigger with Test Class
• jQuery DatePicker Component for Selecting Date in VisualForce Page
• Display Multi-Picklist as Many Checkbox Fields in VisualForce
• Parse a CSV with APEX

Source : Salesforce Wiki

Displaying the check box in a data table or page block table is a general requirement in every project. with the help of wrapper class we can display the checkboxes in a data table. SrinivasaRao Pendala writes a simple and neat article on how to generate checkboxes in data table.

Also added in the code is small javascript so that if we select the header checkbox it will select all the checkboxes.

Read complete article @ Salesforce Wiki

Below version isn’t working due to cross domain issues (As visualforce pages are served from *.force.com domain and salesforce standard pages are served from *.salesforce.com domain, so it results in cross domain errors).

Please read new working version @ https://www.chiragmehta.info/chirag/2010/08/16/salesforce-hide-standard-buttons-display-working-version/

There are many a times where we want to remove few standard buttons from page layout, but there is no such option to remove such restricted buttons. Few such buttons are …

Following is a solution which will hide “Save & Send Invitation” button on New Event page

STEP1: Visualforce Code

<apex :page sidebar="false" showHeader="false">
<script language="javascript" type="text/javascript">
window.onload = new function()
{
window.parent.document.getElementsByName("sendEmail")[0].style.display = 'none';
window.parent.document.getElementsByName("sendEmail")[1].style.display = 'none';
}
</script>

</apex>

STEP2: Create a Home Page Component of type (HTML Area)

<iframe src="/apex/aboveVFPageName" frameborder="0" width="100%" height="100"></iframe>

STEP3: Add above created Home page component in your home page layout.

That’s it you are all set, now open New Event and add invitees, automatically the “Save & Send Invitation” button will disappear.

Following is an algorithm I found on Salesforce Community. It converts a 15 digit salesforce Id to the corresponding 18 digit Salesforce Id. This is pretty helpful in onclick JavaScript codes and S-Controls where merge fields normally return only 15 digits. Also, although the code is in JavaScript, it can be easily converted to any other coding language code.

function normaliseSforceID( id) { // fluff up a 15 char id to return an 18 char id
if (id == null) return id;
id = id.replace(/\"/g, ''); // scrub quotes from this id
if (id.length != 15) {
//print('well, id is not 15, bye' + id + ' ' + id.length);
return null;
}
var suffix = "";
for (var i = 0; i < 3; i++) { var flags = 0; for (var j = 0; j < 5; j++) { var c = id.charAt(i * 5 + j); if (c >= 'A' && c < = 'Z') { flags += 1 << j; } } if (flags <= 25) { suffix += "ABCDEFGHIJKLMNOPQRSTUVWXYZ".charAt(flags); } else { suffix += "012345".charAt(flags-26); } } return id + suffix; }