https://community.appian.com/discussions/f/data/11775/adding-a-validation-to-a-componetI would like to add a single validation to a component . Basically stating that a required field cannot be null..en-USTelligent Community 12https://community.appian.com/thread/52020?ContentTypeID=1Fri, 26 Jan 2018 08:33:21 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:3c65a7a9-602c-4615-8e1b-403332df96acsahilb346This functionality is by default given in Appian. In your component there is a filed &quot;required&quot; make it true (required: true) then that field will be required and the user can&#39;t make it null. and the message will shown to the user if the component is blank.<div style="clear:both;"></div>https://community.appian.com/thread/52015?ContentTypeID=1Thu, 25 Jan 2018 20:44:48 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:01c2ba0c-9c9b-4fb0-85ae-ab2f8757cf64Larson P Thune<p>Your component will have a &#39;Required&#39; field, which you can set to true (e.g. a!textField(label: &quot;My Field&quot;, value: ri!textValue, saveInto: ri!textValue, required: true). This will throw a validation message to the user &#39;a value field is required&#39; if the user tries to submit the form without&nbsp;providing a value in the field.</p><div style="clear:both;"></div>