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WebWork The framework adds support for client-side validation on top of XWork's the standard validation framework.

Client-side validation can be enabled You can enable it on a per-form basis by specifying validate="true" in the form tag:.

<ww<s:form name="'test'" action="'javascriptValidation'" validate="true">
  ...
</wws:form>

You must specify If a name for the form in order for client-side validation.You should also make sure you provide the is not given, the action mapping name will be used as the form name. Otherwise, a correct action and namespace attributes must be provided to the <ww <saf:form> tag. For example, if you have an Action named

...

<s

<ww:form namespace="'/user'" action="'submitProfile'" validate="true">
  ...
</wws:form>

While the following will "work" in the sense that the form will function correctlyTechnically, the form's action attribute can refer to a "path" that includes the namespace and action as a URI. But, client-side validation will not: requires that the action name and namespeact to be set separately.

<s
<ww:form action="'/user/submitProfile.action'" validate="true">
  ...
</wws:form>

Of course, all the standard All the usual validation configuration steps still apply to client-side validation. Client-side validation uses the same validation rules as server-side validation. If server-side validation doesn't work, then client-side validation won't work either.

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Client Side Validation Types

There are two styles of client side validation.

Building a Validator that supports client-side validation

Any validator can be extended to support client-side validation by implementing the com.opensymphony.webwork.validators.ScriptValidationAware interface:

public interface ScriptValidationAware extends FieldValidator {
    public String validationScript(Map parameters);
}

The value returned by validationScript will be executed on the client-side before the form is submitted if client-side validation is enabled. For example, the requiredstring validator has the following code:

public String validationScript(Map parameters) {
        String field = (String) parameters.get("name");
        StringBuffer js = new StringBuffer();

        js.append("value = form.elements['" + field + "'].value;\n");
        js.append("if (value == \"\") {\n");
        js.append("\talert('" + getMessage(null) + "');\n");
        js.append("\treturn '" + field + "';\n");
        js.append("}\n");
        js.append("\n");

        return js.toString();
}

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