[SalesForce] Make a field required on condition

It is not a bug in apex:inputSecret. It happens with all non apex:inputField tags, including apex:text. See this post.

The reasoning is that you can use whatever styling you want to indicate that it is required. For example, I have a Force.com Site where I specify that a field (using an apex:inputText) is required, but I use a red asterisk to indicate requiredness visually. If you want the styling from SF you have to use their inputField or follow one of the workarounds for using their style class.

You can use a combination of the required attribute and <apex:actionFunction> to enforce conditional required behaviour.

Here is an example with Account as StandardController, where the Account Phone becomes mandatory, if the Account Type is 'Other', reverts back to not mandatory otherwise.

 <apex:page StandardController="Account">

    <script>
function setRequired(){
    if(document.getElementById('{!$Component.theForm.thePageBlock.thePageBlockSection.accPhone}').value == '') 
    document.getElementById('{!$Component.theForm.thePageBlock.thePageBlockSection.accPhone}').value = '0';

    reRenderBlock();
    }
    </script>

      <apex:form id="theForm">

      <apex:actionFunction name="reRenderBlock" rerender="thePageBlock"/>

      <apex:pageBlock id="thePageBlock">
      <apex:pageBlockSection id="thePageBlockSection">
      <apex:inputField id="accPhone" value="{!Account.Phone}" required="{!Account.Type == 'Other'}"/>
      <apex:inputField value="{!Account.Type}" onchange="setRequired();"/>

      </apex:pageBlockSection>

      </apex:pageBlock>
      </apex:form>
    </apex:page>

(The only slight quirk I've had to use is set the field value to '0' when it is blank, and when the field needs to change back to non-required, because it would give you an error for a missing value or else)