title: jqgrid different editrules for when adding and editing
body: <p>I have a grid which is used for editing users (permissions, name etc.).<br>
  I also have a Password field, which, in editing mode, is write-only.<br>
  Meaning- the password is not displayed, but if a user inserts a value for this field- then the password is changed.<br>
  My issue is that when editing an existing user, I obviously want the password field to be optional. But when adding a new user, I want to make this field required.<br>
  How can this be acheived?<br>
  thanks  </p>