-After the user login page showdetailedinfo.jsp see personal details when this page has the " Change" hyperlink open the link into the change form modify.jsp, this page has been read into the user' s information to each table single element at, if the user modifies the form elements, press the submit button, you can GetModfify the Servlet to the user to modify the information update to the database table and displays the updated personal details page showmodifyinfo.jsp.
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Each time you press the Submit button, the value in the _sum span is incremented.
每次按下 Submit 按钮时，_sum 范围值递增。
Under these conditions, nothing will happen when you press the Submit button, since your binding is enforcing the fact that the data currently is not valid.
在这种情况下，按Submit按钮时什么事情也不会发生，因为绑定使当前数据成为无效的。
For those of you who do any shopping online, this is precisely why you see warnings not to press the order submit button more than once or else you'll end up with multiple charges on your credit card.
对于那些在线购物的人来说，这恰恰是为什么会看到这样的警告：不要多次按提交按钮，否则您的信用卡上将会多次计费的原因。
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