Simplyfy the logic used in getting the text of input field in the search box.

[Creatoon]

Is your feature request related to a problem? Please describe.
Right now the function of getting the text from the input field is very large, and need shorter implementation in order to reduce code.

Describe the solution you'd like
Use the function onChange() on the input tag and handle the getting text by "event object".

Describe alternatives you've considered
This implementation needs some research about pros and cons, please raise any question.