Javascript validation
Status: Alpha
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#7 Javascript validation
Some kind of framework for javascript validation could be useful, to minimise the invalid data sent over the network. Given that all renderers have to export a function to set an error on a field, and to remove all errors, it may prove not that difficult to implement, but will have to take both the rule and the element it is being applied to into account.
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Given that jsforms now use AHAH, this is actually solved quite nicely. It's not javascript validation, but data is sent to the server via javascript and the results put in place without forcing a whole page reload. The best part is, you only write the validation rule once - on the server - and it will always work the same.