Introducing unspecified margin above a bootstrap 3 affix/scrollspy component

Check out this link to see the navigation with affix and scrollspy functionality as you scroll down (using bootstrap 3):

http://codepen.io/datanity/pen/thnua

Adding white space at the top causes the affix/scrollspy to trigger in the wrong location. For example, here is a demo with 800px of white space added:

http://codepen.io/datanity/pen/haKzg

The challenge is that I don't know in advance how much space will be at the top - sometimes it may be 2000px and other times only 300px. Additionally, I don't have control over the id/class of the divs that may appear on top, which can vary in number and identifiers.

Is there a way to make the affix and scrollspy functions trigger relative to the container they are in, rather than being fixed to a specific pixel location from the top of the body?

Any suggestions or solutions would be greatly appreciated!

javascriptjqueryhtmlcsstwitter-bootstrap

Answer №1

By including this snippet of code at the beginning of the JavaScript, you can resolve the issue. This approach ensures that the positioning of your bootstrap scrollspy and affix elements remains accurate regardless of any white space or additional divs present. 

$('#mynav').affix({
  offset: {
    top: $('#mynav').offset().top
    , bottom: function () {
      return (this.bottom = $('.bs-footer').outerHeight(true))
    }
  }
});

Answer №2

To modify the height of a specific section in your HTML page, you can assign an ID to the element at the top of the page and adjust its height as needed.

<section id="top-section" style="height:800px;">
</section>

Next, include these lines in your JavaScript file:

var $h = $("#top-section").height() + 280;
$("#mynav").attr("data-offset-top", $h);

This code snippet calculates the rendered height of the section element and adjusts the sidebar response height accordingly.

If there are multiple sections with varying heights, it's advisable to wrap the section creation code within a div element. For example, if you're using PHP to generate sections on your webpage, consider implementing this structure:

<div id="section-wrapper">
    <?php echo "Insert your PHP section creation code here" ?>
</div>

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