本文解释了为什么在某些应用场景中使用onkeyup触发器而非onkeypress触发器。onkeypress和onkeydown会在字符实际输入到字段之前触发，导致无法读取实际输入的字符。为确保能正确获取文本区域的内容，应选择使用onkeyup触发器。
Below is from <ajax on java>:
"Why are we using the onkeyup trigger as opposed to onkeypress? This is a "gotcha" that you must understand. The onkeypress event seems like it should work for this application, but it doesn't. onkeypress and onkeydown TRigger their actions before the character makes it into the field, sending whatever is in the field prior to the key press. Since we want to read the actual character, we need to use the onkeyup TRigger instead."
So when we need to read the text from a textarea, we need to use ONKEYUP!
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