How to add delay between adding classes to html elements in JQuery?

Question

I am trying to animate this section of my portfolio page:

I would like for each of those 5 bars to light up one at a time.

Here are is the relevant code for this:

HTML:

<div class="row">
    <div class="col-lg-12 skill-item">
        <div class="row">
            <div class="col-lg-2"><i class="devicon-html5-plain-wordmark"></i></div>
            <div class="col-lg-10">
                <div class="row">
                    <div class="col-lg-12 skill-bar">
                        <div class="row">
                            <div class="col-lg-2 skill-rank-inactive"></div>
                            <div class="col-lg-2 skill-rank-inactive"></div>
                            <div class="col-lg-2 skill-rank-inactive"></div>
                            <div class="col-lg-2 skill-rank-inactive"></div>                                    
                            <div class="col-lg-2 skill-rank-inactive"></div>                                    
                        </div>
                    </div>
                    <div class="col-lg-12 skill-level">
                        HTML5
                    </div>
                </div>
            </div>
        </div>
    </div>

SCSS:

.skill-rank-inactive {
    background: white;
    border: 2px solid white;
    height: 3vh;
    transition: all 2s;
}

#back-end { 
    .skill-rank-active {
        background: $green;
        border: 2px solid white;
        height: 3vh;
    }

    i {
        color: $green;
    }
}

#front-end {
    .skill-rank-active {
        background: $blue-bright;
        border: 2px solid white;
        height: 3vh;
        transition: all 2s;
    }

    i {
        color: $blue-bright;
    }
}

Javascript:

$('#skills-page').bind('inview', function() {
    $('.skill-rank-inactive').addClass('skill-rank-active');
    $('.skill-rank-inactive').removeClass('skill-rank-inactive');
});

Is there a way to add 500ms delay between the transition of each "skill-rank" on the page? There would be multiple skills such as PHP, CSS, etc... I'd like for each skill to start at the same time, ie. the first rank for each skill starts then 500ms the next rank all the way up.

Since blocks never light up at the same time, you actually only need one extra element that blinks on top of each block in turn! Saves the headache of queuing animations. — Gershom Maes
– Gershom Maes, Commented Jul 18, 2017 at 20:18

Scoob · Accepted Answer · 2017-07-18 16:56:38Z

1

I decided to take the approach found on this website:

https://fabriceleven.com/design/creating-fancy-css3-fade-in-animations-on-page-load/

answered Jul 18, 2017 at 16:56

Scoob

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Comments

Gershom Maes · Accepted Answer · 2018-06-18 17:29:59Z

A solution without javascript: Have the 5 elements remain unchanging. Then have a single element (I'll use the pseudo :after element) which moves to cover each in turn, and as it is covering it briefly illuminates.

// No javascript needed! :D

@keyframes moving-light {
  0% { margin-left: 1%; }
  80% { margin-left: 81%; }
  100% { margin-left: 81%; }
}
@keyframes blinking-light {
  0% { opacity: 0; }
  65% { opacity: 1; }
  100% { opacity: 0; }
}

.lightup {
  position: relative;
  width: 100%; height: 30px;
  font-size: 0; /* Get rid of any inline spaces between elements */
}
.lightup > .box {
  display: inline-block;
  width: 18%; height: 100%;
  margin-left: 1%; margin-right: 1%;
  background-color: #a00000;
}
.lightup:after {
  content: "";
  position: absolute;
  display: block;
  width: 18%; height: 100%;
  left: 0; top: 0;
  background-color: #ff4040;
  opacity: 1;
  
  animation:
    5s steps(4, end) infinite moving-light,
    1s ease-out infinite blinking-light;
}

<div class="lightup">
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
</div>

Thomas Devries · Accepted Answer · 2017-07-18 16:47:25Z

0

You can use the setTimeout function to delay something

//delay by 500ms

setTimeout( do_something_here, 500);

edited Jul 18, 2017 at 16:47

Thomas Devries

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answered Jul 18, 2017 at 16:43

derrysan7

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4 Comments

Thomas Devries Over a year ago

setTimeout Is not a JQuery function. It is a function that comes by default in the browser

ibrahim mahrir Over a year ago

setTimeout is not jQuery's.

derrysan7 Over a year ago

Ah my mistake..but still, you can use it with jquery

Scoob Over a year ago

The issue isn't really literally how to delay, but how to rewrite my javascript so that there is a place to put the code to delay.

raj7desai · Accepted Answer · 2017-07-18 17:06:22Z

0

Give all divs a common class like skills Then call a .each on them with a 500 ms delay.

The jQuery function should look something like this:

$('.skills').each(function(){
   setTimeout( $(this).removeClass('skill-rank-inactive'),500);
)}

Call this function on document.ready() or on an event.

answered Jul 18, 2017 at 17:06

raj7desai

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Comments

MTK · Accepted Answer · 2017-07-18 17:09:47Z

0

you can use a loop with setTimeout()

$('#skills-page').bind('inview', function() {

    var delay = 0;

   $.each( $('.skill-rank-inactive'), function(){
        var element = $(this);
        setTimeout(function(){
            element.addClass('skill-rank-active')
            element.removeClass('skill-rank-inactive');
        },delay);

        delay += 500;
    });

});

I know that setTimeout is not jquery but the question has been:

"Is there a way to add 500ms delay between the transition of each "skill-rank" on the page?"

answered Jul 18, 2017 at 17:09

MTK

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