Note: the 2 pieces of code you need to customize are in bold below:
- Exact name of your Model
- Exact name of your custom Signature field
var element = arguments[0], $ = skuid.$;$(".nx-page").one("pageload", function() { // init signature canvas element.jSignature(); element.jSignature("reset"); // Create new signature in text field var model = skuid.model.getModel('Contact'), row = model.getFirstRow(), sigField = 'Signature__c', sigData = model.getFieldValue(row,sigField); if(sigData !== null ) { // read back Signature data element.jSignature("setData", "data:" + sigData); }})