I'm trying to make 2 functions run into only one data-bind, but I'm facing some problems because one of this functions is running inside the HTML and I can't change this. I have google this question and get that: 

```
click:function(key){text: text}, click:callFunction()

```

But this isn't working. The second click bind is working, but the first one no.

Here's my button:

```
<button data-bind="attr: {for: 'CC-prodDetails-' + $data.value}, text:key, 
                                                click:function(key){
                                                    $parent.selectedOption(key);
                                                    $parent.selectedOptionValue(key);
                                                }" class="volt"></button>

```

Here's the function that I need to run:

```
            changeClass: function () {
            $("button.volt").toggleClass('voltActive');
        },

```

Someone could help me?
Put the HTML function inside the other or change it to JS isn't a possibility.