Modify User Input Client Side Before Submitting

[kruez]

Hi all,

I'm attempting to determine if RichFaces can serve the needs of a project I'm working on and I'm hoping someone here might know if what I want to do is possible. Basically what I need is the ability to encode user input before it's sent to the server.

So for example, let's say I want to update my backing bean on every keypress in a textarea. Is there a way I can grab the value, modify it, and have it sent to the server without also showing the modifications in the UI (subsequent decoding will be done on the server so whatever the user entered will be saved exactly as it was entered in the UI)?

Thanks!

[ilya_shaikovsky]

If the changes not needed to be applied on the client why you can't perform needed modifications on server side?

[kruez]

I need to be able to bypass firewall filters over which I have no control. Depending on the user's input their request may be blocked from reaching our server ever. It's less than ideal but that's the nature of the project.

Thanks!

[alexsmirnov]

The required scenario exactly describes SSL protocol functionality, that encodes information on the client side and restores that on the server. It is not possible for any firewall to block encrypted page by content rules.
Moreover, most firewalls do not check submitted requests but block access by response content only, therefore requested feature should encrypt content of output too and decode that on the client.

[alexsmirnov]

The required scenario exactly describes SSL protocol functionality, that encodes information on the client side and restores that on the server. It is not possible for any firewall to block encrypted page by content rules.
Moreover, most firewalls do not check submitted requests but block access by response content only, therefore requested feature should encrypt content of output too and decode that on the client.

[kruez]

Also, SSL is not an option.

[nbelaevski]

Hi,

You can use Javascript to copy values of form fields into hidden fields that will be decoded on server. Use "onsubmit" attribute to define such JS code.