Is it possible to “buffer” DOM changes that happen in a loop (to increase performance)?

user_8309465 0
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To make it clear what I'm asking, here is my example (fiddle).

I have a list of ~500 random names. I have an input at the top that has live-style searching. On every keyup, the value of the input is taken, and every item in the list is matched against it. Items that don't match are hidden.

Subjectively, the performance is okay, but not great. If you type quickly there is a noticeable pause before the list updates. I haven't profiled the code, but the bottleneck is almost certainly the changes to the DOM and the reflows it causes.

I wonder if it's possible to “queue up” these changes and only actually apply them at the end of the loop. So it would be one giant reflow and not lots of little ones.

In another version of the fiddle, I used a RegExp to get more fancy with the matching and presentation. Even though I'm using more DOM manipulation in this one (adding/removing tags to enable match highlighting) the performance feels about the same. I did also try adding visible/hidden classes in CSS and just setting the elements' className to that because that is supposed to be better performing (search for javascript reflows & repaints stubbornella—I can't post more than 2 links) but in my testing (Firefox 54) I found it was worse. So I don't know what's going on there.

What I guess I'm actually asking is: how do I make this code faster?

reflow dom javascript performance
5 Answers

Sometimes, thinking outside the box can be very rewarding...

CSS allows you to easily hide many elements with "display: none" and browsers are exceptionally well optimized when it comes to CSS.

So is there a way to apply this CSS rule to your searched term and let the browser do the job for you? (yes!)

var search = document.getElementById('s');
var list = document.getElementById('l');
var styling = document.getElementById('t');


var searchAction = function() {
    var term = search.value;

    if (term == '') styling.innerHTML = '';
    else styling.innerHTML = '#l>li:not([data-name *= "' + term + '"]) {display: none}';
}

var searchActivateEvent = function() {
    timeoutThing.restartSaveTimeout(searchAction);
}

search.addEventListener('keyup', searchActivateEvent, false);

var timeoutThing = {
    INPUT_TIMEOUT: 00, // ms
    saveTimeoutID: null,

    restartSaveTimeout: function(thingToDo) {
        this.cancelSaveTimeout();
        var that = this;
        this.saveTimeoutID = window.setTimeout(function() {
            thingToDo();
        }, this.INPUT_TIMEOUT);
    },

    cancelSaveTimeout: function() {
        clearTimeout(this.saveTimeoutID);
    }
}
li {
    transition: heigwht .25s ease-in-out, opacity .75s ease-in-out;
}

span {
    background: wheat;
    border-radius: 2px;
}

li.hidden {
    display: none;
}

li.visibru {
    display: list-item;
}
<input id="s">
<style id="t"></style>
<ul id="l">
    <li data-name='Vicente Yeates'>Vicente Yeates</li>
    <li data-name='Bryant Mcmiller'>Bryant Mcmiller</li>
    <li data-name='Analisa Shetterly'>Analisa Shetterly</li>
    <li data-name='Dorotha Graniero'>Dorotha Graniero</li>
    <li data-name='Monte Laranjo'>Monte Laranjo</li>
    <li data-name='Ross Olynger'>Ross Olynger</li>
    <li data-name='Antione Ruehl'>Antione Ruehl</li>
    <li data-name='Shayla Lamprecht'>Shayla Lamprecht</li>
    <li data-name='Latasha Sarkodie'>Latasha Sarkodie</li>
    <li data-name='Duncan Kellems'>Duncan Kellems</li>
    <li data-name='Ike Yanos'>Ike Yanos</li>
    <li data-name='Whitley Catanese'>Whitley Catanese</li>
    <li data-name='Lisa Janek'>Lisa Janek</li>
    <li data-name='Lucas Ahrends'>Lucas Ahrends</li>
    <li data-name='Kena Firmin'>Kena Firmin</li>
    <li data-name='Doug Rardin'>Doug Rardin</li>
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    <li data-name='Kris Ormsby'>Kris Ormsby</li>
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    <li data-name='Chase Schingeck'>Chase Schingeck</li>
    <li data-name='Marc Capraro'>Marc Capraro</li>
    <li data-name='Angele World'>Angele World</li>
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    <li data-name='Margarett Weyer'>Margarett Weyer</li>
    <li data-name='Cedric Nevils'>Cedric Nevils</li>
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    <li data-name='Bernard Missler'>Bernard Missler</li>
    <li data-name='Alonzo Croom'>Alonzo Croom</li>
    <li data-name='Elvin Arflack'>Elvin Arflack</li>
    <li data-name='Suzann Pallazzo'>Suzann Pallazzo</li>
    <li data-name='Shira Elsbury'>Shira Elsbury</li>
    <li data-name='Randell Sterlin'>Randell Sterlin</li>
    <li data-name='Darrick Revolorio'>Darrick Revolorio</li>
    <li data-name='Dorian Mayeux'>Dorian Mayeux</li>
    <li data-name='Cortney Teuteberg'>Cortney Teuteberg</li>
    <li data-name='Eldon Schepis'>Eldon Schepis</li>
    <li data-name='Coleman Chapnick'>Coleman Chapnick</li>
    <li data-name='Bradford Andersson'>Bradford Andersson</li>
    <li data-name='Rob Epperley'>Rob Epperley</li>
    <li data-name='Kieth Lagman'>Kieth Lagman</li>
    <li data-name='Chi Tereska'>Chi Tereska</li>
    <li data-name='Celina Chantler'>Celina Chantler</li>
    <li data-name='Suzanne Aguinaga'>Suzanne Aguinaga</li>
    <li data-name='Madonna Boock'>Madonna Boock</li>
    <li data-name='Rey Gun'>Rey Gun</li>
    <li data-name='Jennie Capata'>Jennie Capata</li>
    <li data-name='Zelma Brunecz'>Zelma Brunecz</li>
    <li data-name='Hubert Yarrito'>Hubert Yarrito</li>
    <li data-name='Ngan Crean'>Ngan Crean</li>
    <li data-name='Claudie Marcou'>Claudie Marcou</li>
    <li data-name='Monte Nicol'>Monte Nicol</li>
    <li data-name='Lane Inacio'>Lane Inacio</li>
    <li data-name='Lenny Alexis'>Lenny Alexis</li>
    <li data-name='Lorene Sistek'>Lorene Sistek</li>
    <li data-name='Brooks Merante'>Brooks Merante</li>
    <li data-name='Rufina Krah'>Rufina Krah</li>
    <li data-name='Bonnie Kieft'>Bonnie Kieft</li>
    <li data-name='Luigi Wahr'>Luigi Wahr</li>
    <li data-name='Brandee Noori'>Brandee Noori</li>
    <li data-name='Gerard Rolson'>Gerard Rolson</li>
    <li data-name='Noriko Buckman'>Noriko Buckman</li>
    <li data-name='Marcella Bathrick'>Marcella Bathrick</li>
    <li data-name='Harlan Michealson'>Harlan Michealson</li>
    <li data-name='Julienne Fuerte'>Julienne Fuerte</li>
    <li data-name='Olivia Ciliberto'>Olivia Ciliberto</li>
    <li data-name='Lorenzo Pollnow'>Lorenzo Pollnow</li>
    <li data-name='Eufemia Crigler'>Eufemia Crigler</li>
    <li data-name='Emogene Tolar'>Emogene Tolar</li>
    <li data-name='Steven Amoriello'>Steven Amoriello</li>
    <li data-name='Stanford Minhas'>Stanford Minhas</li>
    <li data-name='Adolfo Reddick'>Adolfo Reddick</li>
    <li data-name='Michael Flight'>Michael Flight</li>
    <li data-name='Teodora Axtman'>Teodora Axtman</li>
    <li data-name='Takisha Metting'>Takisha Metting</li>
    <li data-name='Johnnie Mullendore'>Johnnie Mullendore</li>
    <li data-name='Dee Prowell'>Dee Prowell</li>
    <li data-name='Joye Skarupa'>Joye Skarupa</li>
    <li data-name='Bernetta Hugel'>Bernetta Hugel</li>
    <li data-name='Jade Capra'>Jade Capra</li>
    <li data-name='Sergio Gieringer'>Sergio Gieringer</li>
    <li data-name='Lorraine Marinez'>Lorraine Marinez</li>
    <li data-name='Eugenia Kreinbring'>Eugenia Kreinbring</li>
    <li data-name='Karin Brackey'>Karin Brackey</li>
    <li data-name='Sona Toothman'>Sona Toothman</li>
    <li data-name='Tresa Sylvester'>Tresa Sylvester</li>
    <li data-name='Emile Mccrate'>Emile Mccrate</li>
    <li data-name='Miranda Coppage'>Miranda Coppage</li>
    <li data-name='Wava Kathan'>Wava Kathan</li>
    <li data-name='Euna Bate'>Euna Bate</li>
    <li data-name='Reina Catalanatto'>Reina Catalanatto</li>
    <li data-name='Jody Barner'>Jody Barner</li>
    <li data-name='Margherita Demopoulos'>Margherita Demopoulos</li>
    <li data-name='Yu Imboden'>Yu Imboden</li>
    <li data-name='Irina Huppenbauer'>Irina Huppenbauer</li>
    <li data-name='Forest Lowenthal'>Forest Lowenthal</li>
    <li data-name='Jamar Loman'>Jamar Loman</li>
    <li data-name='Maurice Kotler'>Maurice Kotler</li>
    <li data-name='Renato Feldstein'>Renato Feldstein</li>
    <li data-name='Dulcie Pinter'>Dulcie Pinter</li>
    <li data-name='Doretta Breiner'>Doretta Breiner</li>
    <li data-name='Mireille Betsinger'>Mireille Betsinger</li>
    <li data-name='Jc Emerton'>Jc Emerton</li>
    <li data-name='Yahaira Klee'>Yahaira Klee</li>
    <li data-name='Glady Annen'>Glady Annen</li>
    <li data-name='Jaime Alicandro'>Jaime Alicandro</li>
    <li data-name='Branda Darnstaedt'>Branda Darnstaedt</li>
    <li data-name='Christiane Kissik'>Christiane Kissik</li>
    <li data-name='Lester Tartamella'>Lester Tartamella</li>
    <li data-name='Nikki Shoaf'>Nikki Shoaf</li>
    <li data-name='Vern Teteak'>Vern Teteak</li>
    <li data-name='Albertha Vankilsdonk'>Albertha Vankilsdonk</li>
    <li data-name='Greg Pesch'>Greg Pesch</li>
    <li data-name='Nam Bahner'>Nam Bahner</li>
    <li data-name='Korey Smit'>Korey Smit</li>
    <li data-name='Brock Arview'>Brock Arview</li>
    <li data-name='Robin Danos'>Robin Danos</li>
    <li data-name='Jonah Shoener'>Jonah Shoener</li>
    <li data-name='Bernardina Michelini'>Bernardina Michelini</li>
    <li data-name='Cody Stachniw'>Cody Stachniw</li>
    <li data-name='Maribeth Benner'>Maribeth Benner</li>
    <li data-name='Louie Codell'>Louie Codell</li>
    <li data-name='Alvera Vallarta'>Alvera Vallarta</li>
    <li data-name='Amy Schmauder'>Amy Schmauder</li>
    <li data-name='Doretha Megee'>Doretha Megee</li>
    <li data-name='Clora Okins'>Clora Okins</li>
    <li data-name='Antoine Colomba'>Antoine Colomba</li>
    <li data-name='Daniell Tramel'>Daniell Tramel</li>
    <li data-name='Marge Sebastian'>Marge Sebastian</li>
    <li data-name='Savannah Ortic'>Savannah Ortic</li>
    <li data-name='Renita Strahan'>Renita Strahan</li>
    <li data-name='Elvia Deerman'>Elvia Deerman</li>
    <li data-name='Kris Bonsal'>Kris Bonsal</li>
    <li data-name='Lili Aulds'>Lili Aulds</li>
    <li data-name='Roman Pessoa'>Roman Pessoa</li>
    <li data-name='Shon Fonsecn'>Shon Fonsecn</li>
    <li data-name='Elmo Mcclain'>Elmo Mcclain</li>
    <li data-name='Brittni Stott'>Brittni Stott</li>
    <li data-name='Byron Syndergaard'>Byron Syndergaard</li>
    <li data-name='Quinn Hach'>Quinn Hach</li>
    <li data-name='Joey Buissereth'>Joey Buissereth</li>
    <li data-name='Benedict Giacobbe'>Benedict Giacobbe</li>
    <li data-name='Merna Ihrke'>Merna Ihrke</li>
    <li data-name='Chase Chryst'>Chase Chryst</li>
    <li data-name='Truman Haroldsen'>Truman Haroldsen</li>
    <li data-name='Carry Elswick'>Carry Elswick</li>
    <li data-name='Raymonde Emrich'>Raymonde Emrich</li>
    <li data-name='Isreal Kieke'>Isreal Kieke</li>
    <li data-name='Fredricka Judy'>Fredricka Judy</li>
    <li data-name='Brendan Brester'>Brendan Brester</li>
    <li data-name='Karin Kitchell'>Karin Kitchell</li>
    <li data-name='Tabitha Han'>Tabitha Han</li>
    <li data-name='Dotty Vandeveer'>Dotty Vandeveer</li>
</ul>
<script src="file:///tmp/s.js"></script>

Basically:

  1. use an attribute to store the value to search within
  2. tailor a custom CSS selector to apply the "display:none" rule
  3. use a bit of JS to feed a "style" tag with your tailored selector and rule

That's it, no more JS hurdle, only CSS doing it's job at lightning speed. Supported in all browsers and you only update 1 hidden element in the page (the "script" tag).

I also have updated your JS fiddle for the example.

user_59150000
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