Xrm.Page.getAttribute looking for value on the page but not within DB table.

Hello Experts, this is definitely a weird scenario occurred this week. I'm using Xrm.Page.getAttribute("").getvalue() to check if a field is null or not before progressing forward. If it's null throw a popup to fill in the value. If it has a value kick off a OOB workflow(All this executes by clicking a button). Whats happening here is, when the field is null it's throwing popup, but when user enters the value and clicks button again without saving the field value, it's considering that the field is having a value. Any Ideas?