CODEWITHSUNDEEP
javascriptjquery
Asciiom
Asciiom

Reputation: 9975

Switch tabs based on mouse scroll

I would like to have a widget on a webpage containing a number of tabs. When the user scrolls the page and the widget comes in to view and he keeps scrolling down, the tabs should be activated one by one (without the page scrolling further down). Once the last tab is showing, the page should resume scrolling as usual. Is this doable using JS/jQuery?

UPDATE: Since this seems too broad a question: The problem is, I don't know how to use the scroll offset and prevent the page from scrolling down until I decide it can resume its normal behavior

UPDATE 2 I created This fiddle, 

$(document).ready(function(){

    $('#tabbed').mouseover(function(){
        $(this).focus();
    }).scroll(function(){
        console.log("scrolling tabs");
    });

    $(window).scroll(function(evt){
        var scrollPos = $(this).scrollTop()
        console.log(scrollPos); 

        // BULLETPROOF WAY TO DETECT IF THE MOUSE IS OVER THE
        // SCROLLABLE DIV AND GIVE IT FOCUS HERE?
    });
});

it contains a long page and a scrollable div among its contents. The only problem is that the div starts catching scroll events only if I move my mouse. If I could find a bulletproof way to activate the scrolling div whenever the mouse is over it I'm there. Any ideas?

Upvotes: 0

Views: 3814

Answers (2)

Igor Vieira
Igor Vieira

Reputation: 46

You can't prevent scrolling with javascript. Using iframes and divs with scroll will only work if the mouse is over them.

You can cancel the mouse wheel and keys events related to the scrolling, however the user will be able to scroll using the scrollbar (more here).

Another approach is leaving an empty area and fixing your widget inside this area, like in this working example

$(window).bind('scroll', function()
{
    var scroll = $(window).scrollTop(),
        innerHeight = window.innerHeight || $(window).height(),
        fooScroll = $('#fooScroll'),
        emptyArea = $('#emptyArea'),
        offset = emptyArea.offset(),
        fixedClass = 'fixed';

    if(scroll > offset.top)
    {
        if(scroll < offset.top + emptyArea.height() - fooScroll.height())
        {
            fooScroll.addClass(fixedClass);
            fooScroll.css("top", 0);
        }
        else
        {
            fooScroll.removeClass(fixedClass);
            fooScroll.css("top", emptyArea.height() - fooScroll.height());
        }
    }
    else
    {
        fooScroll.removeClass(fixedClass);
        fooScroll.css("top", 0);
    }
});

Then you can change the tabs while the page is scrolling.

Upvotes: 2

Peter Berg
Peter Berg

Reputation: 6206

You should be able to do this. You can use the jQuery scroll event to run your own code whenever the user scrolls up or down. Also, so long as you call e.preventDefault() whenever the scroll event is fired, you can prevent the whole window from scrolling up or down.

Upvotes: 1

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