Simple helper script which shows current Bootstrap breakpoint, viewport dimensions and - if clicked, wraps all elements in borders for simpler UI debugging.
https://codepen.io/qstudio/pen/bGpWYYg?editors=1111
<html>
<head>
<script type='text/javascript' src='https://code.jquery.com/jquery-1.12.4.min.js'></script>
<script type='text/javascript'src='https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js'></script>
<script type='text/javascript' src='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js'></script>
<style>body.debug :not(.nodebug) { border: 1px dashed pink !important; }</style>
<title>Q Studio ~ Bootstrap Helper</title>
</head>
<body>
<script>
if( typeof jQuery !== 'undefined' ) {
// assign target ##
var $bs_element = "#bs_helper";
var $bs_helper;
// show breakpoint on load, tooltip will be updated to show actual document dimentions ##
jQuery(window).load(function(){
// assign target ##
$bs_helper = jQuery($bs_element);
q_bootstrap_tooltip( true, false );
// click to add debug borders ##
$bs_helper.click( function() {
jQuery("body").toggleClass("debug");
});
});
// resizing, open tooltip and update document dimensions as they change ##
jQuery(window).on('resize', function(){
q_bootstrap_tooltip( false, true );
});
};
// Tooltip with BS breakpoint info ##
function q_bootstrap_tooltip( load, resize ) {
// sizes ##
vw = Math.max(document.documentElement.clientWidth || 0, window.innerWidth || 0);
vh = Math.max(document.documentElement.clientHeight || 0, window.innerHeight || 0);
// resize ##
resize = resize || false;
load = load || false;
// update attrs ##
$bs_helper.attr('title', 'Width: ' vw 'px<br />Height: ' vh 'px' );
$bs_helper.html( q_bootstrap_breakpoint().name );
if ( load ) {
// trigger tooltip ##
$bs_helper.tooltip('show');
setTimeout(function(){
$bs_helper.tooltip('hide');
}, 3000);
}
// possible delay, for resizing ##
if ( resize ) {
// trigger tooltip ##
$bs_helper.tooltip('show');
// set short timeout to update document dimensions, as they change ##
setInterval(function(){
jQuery('.tooltip-inner').html( 'Width: ' vw 'px<br />Height: ' vh 'px' );
}, 30);
// add an event listener to check for an end to the resize action ##
window.addEventListener(
"resize",
q_bootstrap_debounce(
function(e){
// when resizing is done, set a timeout for 3 secs, then close the tooltip ##
setTimeout(function(){
$bs_helper.tooltip('hide');
}, 3000 );
}
), { passive: true } // Passive Event Listener ##
);
}
}
// resize debouncer, set form eventlistener ##
function q_bootstrap_debounce( func ){
var timer;
return function(event){
if(timer) clearTimeout(timer);
timer = setTimeout(func,100,event);
};
}
/*
https://cdn.jsdelivr.net/npm/bootstrap-detect-breakpoint/src/bootstrap-detect-breakpoint.js
*/
function q_bootstrap_breakpoint() {
const breakpointNames = ["xl", "lg", "md", "sm", "xs"]
let breakpointValues = []
for (const breakpointName of breakpointNames) {
breakpointValues[breakpointName] = window.getComputedStyle(document.documentElement).getPropertyValue('--breakpoint-' breakpointName)
}
let i = breakpointNames.length
for (const breakpointName of breakpointNames) {
i--
if (window.matchMedia("(min-width: " breakpointValues[breakpointName] ")").matches) {
return {
name: breakpointName,
height: vh,
width: vw,
index: i
}
}
}
return null
}
</script>
<span
id="bs_helper"
class="nodebug badge badge-warning"
data-toggle="tooltip"
data-placement="top"
data-html="true"
title="Tooltip on top"
style="position: fixed; left: 0; bottom: 0; padding: 20px;"
>~@~
</span>
<div class="example p-5">hello<strong class="ml-1 text-strong">world</strong></div>
</body>
</html>