Jquery mobile change page with page transition from javascript

I am making transitions using this page: http://jquerymobile.com/demos/1.2.0/docs/pages/page-transitions.html

I make the transition when I click on the link:

<a href="#page1" data-transition="slide" data-role="button" > Submit </a>

This makes the slide transition.

If I need to change the data transition attribute in data-transition = "none", I will not get any transition.

Now I want to do some logic before making the transition. In other words, it would be nice if I could perform the same transition with javascript. This is what I have right now:

function GoTopage1()
{
    if(someVar == true)
        window.location = "#page1";
}

and my link is now similar:

<a onclick="GoTopage1()" data-transition="slide" data-role="button" > Submit </a>

This code works, but I lost the slide transition. When you click on the link, I get a default transition that goes into transition. How can I make the transition with the code?

Edit

, , :

:

<a id="t1" href="#page1"  data-transition="slide" ></a>

:

function GoTopage1()
{
    if(someVar == true)
        $("#t1").click(); // simulate link click        
}