Help to get this work SPFx React webpart.

Hello Experts ,

I am new in learning of SPFx react. I have following scenario:

when a label value is equal to TextField value, a button should be disabled else should be enabled.

I have written below code. but It is running when I clicked on button. But I want when TextField value is equal to Label value the button should be disabled on runtime.

Please help/correct my code. Thanks in advance.

and the code is: