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JavaScript

Posted by James Moran
James Moran
7,271 Points

Is it possible to position a button to bottom of screen if within 100vh?

I'm trying to position the button with the id of '#action-buttons' to the bottom of the page. Although this works whether it is visible or not, I would like it to work if it is within 100vh of the window.

function isButtonVisible(button) {
    if ($(button).visible()) {
        return true;
    } else {
        return false;
    }
}

function positionButton() {
    var aButton = '#action-buttons';

    $(aButton).css('position', 'static');

    if (isButtonVisible(aButton)) {
        $(aButton).css('position', 'fixed');
        $(aButton).css('bottom', '50px');
        $(aButton).width($('#create-advert .main-pages').width());
    } else {
        $(aButton).css('position', 'static');
        $(aButton).css('width', '100%');
    }
}

positionButton();

$('#next-button').click(function () {
    positionButton();
});

Thanks!!

3 Answers

Shane Oliver
Shane Oliver
19,977 Points
Shane Oliver
Shane Oliver
19,977 Points

The window object has several ways to get the height of the client one of them is window.clientheight. You will need to check the window scroll and measure it against the client height to determine whether it is within or outside of bounds

James Moran
James Moran
7,271 Points

I followed your advice and solved it by comparing the window height to the position of the button on the page.

function isButtonVisible(button) {
    return $(window).height() > $(button).offset().top;
}

Thanks for the help!

Shane Oliver
Shane Oliver
19,977 Points
Shane Oliver
Shane Oliver
19,977 Points

The window is always 100vh - so the button will always show.

James Moran
James Moran
7,271 Points

Ah okay. Well is there a way to tell if it is within the view of the window?

Shane Oliver
Shane Oliver
19,977 Points
Shane Oliver
Shane Oliver
19,977 Points

You can simplify your isButtonVisible function to one line too

return $(button).visible();

James Moran
James Moran
7,271 Points

Oh yeah! Thanks :)