There is a solution in Lightning How to get on change events for lightning:inputRichText? but we are using a Visualforce page so I'm wondering if there is a workaround to do it in Classic? This is what I've doing now but it does not work
<apex:pageBlockSectionItem >
<apex:inputField value="{!Rich_Text__c}" onblur="Save()" />
</apex:pageBlockSectionItem>
This also did not work:
<apex:pageBlockSectionItem >
<apex:inputField value="{!Rich_Text__c}" onchange="Save()" />
</apex:pageBlockSectionItem>
Thanks