<input type=text>繫結onchange事件的注意事項：

$('input[name=myInput]').change(function(){...});

However, this event will only fire when the selector has lost focus, so you will need to click somewhere else to have this work.

This is so useful, it is worth putting it in an answer. Currently (v1.8*?) there is no .input() convenience fn in jquery, so the way to do it is

$('input.myTextInput').on('input',function(e){
 alert('Changed!')});

$('elementName').keyup(function(){
 alert("Key up detected");});

http://stackoverflow.com/questions/1443292/how-to-implement-onchange-of-input-type-text-with-jquery