validation - Custom ValidationTextBox in Dojo -

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i new dojo programming , trying create validationtextbox username input. have 3 criteria: 1. users can input alphanumeric characters , 2. minimum length of username 6 character 3. field required

so far input looks like:

<input name="username"     type="text"     id="username"     class="reqd1"     required="true"     trim="true"     lowercase="true"     promptmessage="username"     invalidmessage="please enter alphanumeric characters."    maxlength="12"     regexp="[\w]+"    intermediatechanges="false"    dojotype="dijit.form.validationtextbox" />

i have 3 questions: 1. how can check the minimum character of username field? 2. there way change invalidmessage programatically? 3. how can check length of username field without using regex?

  1. regexp="\w{6,12}"
  2. dijit.byid("username").set("invalidmessage", "new message");
  3. i think regexp best way in case

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