this
CKEDITOR.on('instanceReady', function(e){
this.dataProcessor.writer.setRules( 'p', {
indent : false,
breakBeforeOpen : false,
breakAfterOpen : false,
breakBeforeClose : false,
breakAfterClose : false
});
});TypeError: Result of expression 'this.dataProcessor' [undefined] is not an object.

Re: Change dataProcessor rules for all CKEditors
CKEDITOR.on('instanceReady', function(e){ e.editor.dataProcessor.writer.setRules( 'p', { indent : false, breakBeforeOpen : false, breakAfterOpen : false, breakBeforeClose : false, breakAfterClose : false }); });