On your page under Angular 4 UI Components > jqxInput > Binding to JSON Data > Demo tab there is an error which I also have on my application. Here is the case:
I type ‘Ana’ and I select the value from the auto suggest list. The selected value ‘Ana Trujillo’ is displayed on the input correctly. Next I use the backspace button to clean the jqxinput from the selected value. When jqxinput is clean, I try to enter a new value but whatever character I type the jqxinput component displays this value inside [object Object].