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Apache Struts 2 Documentation
Client Validation
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Let's create a Client-Side validation workflow, step by step.

The `validate` attribute is set to `true`.

Some themes do not support client-side validation.

## Step 1

Create the form.

This case uses the default xhtml theme, so the `<s:head >` tag is used to link a style sheet.

## Step 2

Create the Action class.

### Step 3

Create the `validation.xml` to configure the validators to be used.

### Action and Namespace

A correct action and namespace attributes must be provided to the <s:form> tag. For example, if the action named "quizClient" is defined in the "/validation" namespace, the form must be configured as:

While the following will "work" in the sense that the form will function correctly, client-side validation will not. That is because Struts must know the exact namespace and action (rather than a URL) to properly support validation.