| 摘要 |
According to one embodiment of the invention, a technique is provided for validating user-entered data at a server without requiring a page refresh at a client. A server sends, toward a client, a page that comprises a form through which the client's user can input data. The page comprises instructions that cause the client to send, toward the server, data that the user inputted into the form. If the server determines that the data do not satisfy the specified criteria, the server sends an invalidity signal toward the client. The page also comprises instructions that cause the client to display a message in response to receiving the signal. In response to the signal, the client modifies the display of the page to include the message. All of the above is accomplished without the client requesting additional pages from the server, and without the server sending additional pages toward the client.
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