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Vaadin Forum3. Vaadin 6, 7, 8Framework UI

TextField/TextArea whith label counter

Aurelien _
1 decade ago Mar 16, 2010 7:38am

Hello,

I would like to create a component that will have a TextField and a label that will count the number of characters entered by the user. This calculation is done on the client side.

I started looking for how to do this but I have some problems to implement.

Someone can give me some tracks?

In advance thank you

Aurel

Marko Grönroos
1 decade ago Mar 16, 2010 11:10am

It would be almost identical to my Client-Side Validated TextField, minus the validation. It captures input in onKeyUp() and displays the validation error in a <span> element after the text field.

See the project site for a demo and a link to the source code. It's a fairly simple extension of the TextField component. The most relevant source file would be VCSValidatedTextField.java. You wouldn't need much server-client serialization in a component with just a counter, unless you want to have some server-side API for customizing the counter (would be very useful to have reverse counter at least).

Mmm... I suppose I could consider extending my component a bit so that it could display text in the error area also in a "valid" (and partial) situation. Then, a counter would be trivial to do with a simple JavaScript validator.

A counter would also be useful for a TextArea.