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what this mean

Note that the call must be made inside of a $(document).ready() call, or the plugin will not work!

any1?

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— short answer: the phrase means "start the plugin only after the page's DOM is ready." If your init code runs before the elements it needs exist, the plugin cannot attach itself and will appear to do nothing. 's links about the dollar sign are useful background; below focuses on the "ready" part and practical checks.

Here are common ways to ensure code runs after the DOM is built:

$(document).ready(function() {
  $('#yourElement').yourPlugin();
});
$(function() {
  $('#yourElement').yourPlugin();
});

If another library has taken over $, call jQuery explicitly or wrap in an IIFE:

jQuery(document).ready(function() {
  jQuery('#yourElement').yourPlugin();
});

(function($){
  $(function(){
    $('#yourElement').yourPlugin();
  });
})(jQuery);

Quick troubleshooting checklist when a plugin "will not work":

  • Confirm script order: jQuery first, plugin file second, init script last.
  • Look in the console for errors like "is not a function" — indicates plugin not loaded or wrong order.
  • Verify selectors actually match elements: check $('#selector').length in console.
  • If plugin needs images or external resources, try window.onload instead of DOM ready.
  • If using async, avoid it for dependent scripts; defer keeps order and runs after parsing.
  • If using jQuery.noConflict(), use jQuery(...) or an IIFE that passes jQuery as $.

For official details see the jQuery ready docs and MDN on DOMContentLoaded:
jQuery ready documentation
MDN on DOMContentLoaded

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