ASP.NET：未触发 onchange 事件

Question

I have an asp.net program in which I place a marker on a google map when the address in a textbox is changed. This Javascript is triggered by the onchange event. However I have noticed that if the user does not 'tab' out of the box before clicking submit, the event does not fire. Is there a way I can fix this?

Answer 1

I think what you are trying to achieve is impossible. the onchange event, happens only when you lose focus on the element. You could use onkeypress, onkeydown or onkeyup to get that change quicker. The problem here is that the value of the textbox is going to be changed by the click of an external element and therefore, you cannot bind it directly to the textbox.

If you know exactly what the clickable elements would be, you could add a click event to each one of them, pointing to a function that would test the textbox current value against the latest known value and if they were different, do whatever you want to do. But i don't think that's the case...

following your comment, you should add a submit event to the form, that would compare the current state of the textbox before submitting the form...