>>So, it doesn't work here this way.
>
>So I'm assuming you have '$scope.disableClearMessage = true; ' in the controller.
>Works for me.
>Try 'disable-action="{{disableClearMessage}}"' and 'disable-action="disableClearMessage"' in the markup and inspect the button in the browser for each case.
>The first should show 'true' (which is what you want) and the second show 'disableClearMessage' (which is obviously useless)
>
>
It doesn't work for me, I am getting errors. Here is what I get for the button code (and I got errors so it doesn't show correctly):

<a ng-click="click()" ng-disabled="disableAction" class="btn btn-default ng-isolate-scope" confirm-title="Confirm Clear" 
confirm-message="'Are you sure you want to clear all e-messages?'" ok-label="Yes" cancel-label="No" 
link-text="Clear E-Messages" disable-action="{{disableClearMessage}}" ok-action="clearEMessage()">{{ linkText }}</a>

So, the directive didn't work and the disable-action didn't get evaluated.

Are you testing with the directive or just the button itself?

One more time, here is directive called confirmButton.js (I changed back the template):

(function () {
    'use strict';
    // <confirm-button class="btn btn-default" confirm-title="Please confirm" link-text="Release Lock"
    //    confirm-message="{{canUseAFunction()}}" ok-label="Yes" ok-action="releaseLock(currentItemTree.node_id)" cancel-label="Cancel"></confirm-button>
    var app = angular.module('sysMgrApp');

    app.directive('confirmButton', [function() {
        return {
            restrict: 'AE',
            transclude: true,
            replace: true,
            scope: {
                linkText: '@',
                okLabel: '@',
                cancelLabel: '@?',
                confirmTitle: '@',
                confirmMessage: '=',
                onOpen: '&',
                okAction: '&',
                disableAction: '='
            },
            controller: ['$scope', '$modal', function($scope, $modal) {
                $scope.okClass = 'btn-danger';
                $scope.message = $scope.confirmMessage;
                $scope.title = $scope.confirmTitle;
                //      $scope.okLabel = $scope.okLabel;
         //       console.log('Before: ' + $scope.cancelLabel);
                $scope.cancelLabel = $scope.cancelLabel || 'Cancel';
         //       console.log('After: ' + $scope.cancelLabel);
                console.log('DisableAction: ' + $scope.disableAction);
                $scope.click = function () {
                  
                    if ($scope.onOpen) {
                        $scope.onOpen();
                    }
                    var modal = $modal.open({
                        scope: $scope,
                        templateUrl: '/app/templates/modal.html'
                    });

                    modal.result.then(function (result) {
                        $scope.okAction();
                    });
                };
            }],
            template: '<a ng-click="click()" ng-disabled="disableAction" >{{ linkText }}</a>'
        };
    }]);
    
})();

Here is my current markup in the form which is partial view called from another form:

<ng-form name="editEMsgForm">
    <div class="form-horizontal">
        <div class="padd">
            <div class="form-group">
                <data-confirm:button class="btn btn-default" confirm-title="Confirm Clear"
                                     confirm-message="'Are you sure you want to clear all e-messages?'"
                                     ok-label="Yes"
                                     cancel-label="No"
                                     link-text="Clear E-Messages"
                                     disable-action ="{{disableClearMessage}}"
                                     ok-action="clearEMessage()"></data-confirm:button>
              
                    <div class="col-lg-9">
                        <textarea name="eMessage" rows="18" class="form-control" readonly
                                  id="eMessage" ng-model="currentOperator.eMessage"></textarea>
                    </div>            
            </div>
        </div>
    </div>
</ng-form>

In the controller's code I have now the following:

 app.controller('operatorsCrudController', ['$scope', '$rootScope', '$modal', '$timeout', '$stateParams', '$state', 'operatorsService',
        function ($scope, $rootScope, $modal, $timeout, $stateParams, $state, operatorsService) {

            var init = function() {
                $scope.showForm = false;
                $scope.disableAction = false;
                $scope.isEditLoading = false;
                $scope.disableClearMessage = false;

				load($stateParams.id);
            };

and I am setting this variable to correct value (true or false) down in the code that is executed on new or load.

Can you try similar setup, please? Right now using {{ doesn't work and produces an error.