检测没有事件处理程序的情况下TextBox控件的文本是否已更改

Question

I know that there is an event handler TextChanged that fires when a TextBox control's text has been changed but I am wondering if there is another way to detect if a TextBox has had it's value changed?

I read that you can do something like store the initial value of the TextBox in the html tag but there was no detail on how to do that. Then apparently you can compare the initial value of the TextBox to it's current value and then run some code.

Answer 1

This is just a trick. You must use the native event.

var previousText = "";
setInterval(function(){

    var currentText = GetTextboxValue();

    if(currentText != previousText){

        // Raise the event here using currentText.

        previousText = currentText;
    }

}, 200);