Percentage of what? You provide a total amount of votes for one item. From what do you want to get a percentage?

      'value' => ($item->detail->FbVote + $item->detail->TwitVote + $item->detail->MailVote/100),

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percentage = (part / total) * 100

You need your total amount of votes to be able to calculate your percentage. Dividing your sum by 100 will not give you a percentage.

read

LaurentMeganck

How To Add string To Value

                       'value' => ($item->detail->FbVote+$item->detail->TwitVote+$item->detail->MailVote*100)/100,'%',

Is Not Display ??

Or Change In Pie-Chart.js

First of all, still wrong calculation

Second

(($item->detail->FbVote+$item->detail->TwitVote+$item->detail->MailVote*100)/100) . '%'

wich is basically the same as

($item->detail->FbVote+$item->detail->TwitVote+$item->detail->MailVote) . '%'