bxslider calculating wrong viewport size on load

Question

Anyway I recently started using bxslider and I'm having an issue with it.

It seems to calculate its viewport size wrongly on page load, which means it doesn't work well on mobile devices, tablets etc.

The weird thing is, when I resize the window of the browser(even just for a pixel) the viewport height gets calculated correctly and everything looks fine. But if I refreshed the page with same height and width bx-viewport wouldn't be correctly calculated.

Any idea why this is happening?

HTML looks something like this(and yeah I'm aware that it probably hasn't got anything to do with it, but still):

<ul class="seminars-slider">
    <li>
        <article class="education-article">
            <h3><a href="#"> Sit tincidunt eros massa, lundium ultrices, sit in aliquet velit</a></h3>
            <p>LOL1</p>
            <div class="buttons">
                <a href="#" class="book-button"><span>Book now</span></a>
                <a href="#" class="read-more"><span>Read more</span></a>
            </div>
            <div class="clearall"></div>

        </article>
    <div class="clearall"></div>
    </li>

    // same li
    <li>
        <article class="education-article">
            <h3><a href="#"> Sit tincidunt eros massa, lundium ultrices, sit in aliquet velit</a></h3>
            <p>LOL1</p>
            <div class="buttons">
                <a href="#" class="book-button"><span>Book now</span></a>
                <a href="#" class="read-more"><span>Read more</span></a>
            </div>
            <div class="clearall"></div>

        </article>
    <div class="clearall"></div>
    </li>
</ul>          

js call looks like:

slider=jQuery('.seminars-slider').bxSlider({
    mode: 'vertical',
    controls:false,
    pager:false,
    minSlides:2,
    maxSlides:2,
    moveSlides:1
});

jQuery('.up-control').click(function() {
    slider.goToNextSlide();
});
jQuery('.down-control').click(function() {
    slider.goToPrevSlide();
});

Thanks.

Answer 1

It could be that you're calling the bxSlider function too early. If you're invoking it from

$(document).ready(function() { ... });

consider instead using

$(window).load(function() { ... });

The difference between using those two functions is that (document).ready waits until the DOM has been shown to the user in it's initial state, whereas (window).load actually waits until all resources have been loaded onto the DOM.