saveSignature Snippet

Note: the 3 pieces of code you need to customize are in bold below:

Exact name of your Model
Exact name of your custom Signature field
Exact name of the Unique Id that you assign to your custom Signature component

var params = arguments[0],

$ = skuid.$;

var model = skuid.model.getModel('Contact'),

row = model.getFirstRow(),

sigField = 'Signature__c';

// get signature from id

var sig = $("#idSign");

var sigData = sig.jSignature("getData", "base30");

// update signature text field SF and save

model.updateRow(row,sigField,sigData[0] + ',' + sigData[1]);

model.save();