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Customising the CMS

How to run a function after certain CMS fields have been changed


4 Posts   715 Views


3 October 2011 at 3:22pm (Last edited: 3 October 2011 3:24pm), Community Member, 130 Posts

I've got a function I want to run on page save/ publish if certain custom CMS fields have been changed.

For example:

class Foo extends DataObjectDecorator {
public function updateCMSFields() {
$fields->addFieldsToTab("Root.Content", array(
new NumericField('Bar', 'Change me and save this page to trigger FooBar function')

function FooBar(){
//Do things
//With stuff

Any ideas?


3 October 2011 at 9:47pm Forum Moderator, 1796 Posts

create some custom javascript to handle the change (inspect the current form to get the required ID to watch), add a REquirements::javascript within the function - job done.


4 October 2011 at 8:40am Community Member, 130 Posts

Hi Swaiba

Thank you for that.

I understand the principle of what you're saying but struggling with the correct execution.

Do you have any code examples of how to do this?



6 October 2011 at 8:07am (Last edited: 6 October 2011 8:07am), Forum Moderator, 1091 Posts

Looking at the SiteTree::onBeforeWrite() function I noticed the use of $this->isChanged('URLSegment') (line 1339). So maybe this would work in your Page class:

protected function onBeforeWrite() {

   if ($this->isChanged('SomeField')){
      // do something


Mind - I didn't test it...