I set a progress in my app  

I want to controll The progress in angular's directive  

but how can I change `data-value` and `data-total` in directive's link func?

**app.html**

```
    <div class="ui indicating small progress" data-value="39" data-total="50" plan-progress>
      <div class="bar">
        <div class="progress"></div>
      </div>
    </div>

```

In this html, I want change `data-value` and `data-total` 

I try this:

**app.js**

```
  todoApp.directive('planProgress', function() {
    return {
      link: function(scope, elem, attrs) {
        attrs.value = 10
        attrs.total = 20
        elem.progress();
      }
    };
  });

```

But it doesn't work  

so I want to know how to change it in my directive?