Slow response when the HTML table is big

Question

I am using JavaScript to generate a HTML table of 4 columns, but when the table became very large (e.g. more than 1000 rows), the user could face lag between their interaction (e.g. hovering on a row, scrolling, or clicking something) and the response of the webpage.

This is the demo to show my issue, please run it on fullscreen, you can notice (or not noticing it if your computer is fast enough...) a small lag of hover effect when you move your mouse quickly between rows:

/**   * @namespace Start the project called 'stck'   */  var stck = {};    /**   * Variable to save stock loaded   */  stck.stockInfo = [];    /**   * Load the item informaction acording the SKU   * @private   * @param {string} SKU The SKU of the item   */  stck.loadItemInformation = function(SKU) {    var descriptionsTable = document.getElementById('descriptionsTable');    for (var rowsLength = descriptionsTable.rows.length - 1; --rowsLength; ) {      descriptionsTable.deleteRow(1);    }    var pricesTable = document.getElementById('pricesTable');    for (var rowsLength = pricesTable.rows.length - 1; --rowsLength; ) {      pricesTable.deleteRow(1);    }    document.getElementById('tableHeader').style.cssText = '';    document.getElementById('tableContent').style.cssText = '';      // Load data with AJAX and process here    document.getElementById('addItemButton').className = 'hidden';    document.getElementById('saveButton').className = document.getElementById('cancelButton').className = '';    document.getElementById('tables').className = 'hidden';    document.getElementById('editItem').className = 'active';  };    /**   * Show row to the 'tableContent' table.   * @public   * @param {number} showQuantity The quantity that will be loaded   * @param {boolean} isLoadNewStock Define if the quantity that are going to be show are lower than stock, will load new stock information or not   */  stck.showRow = function(showQuantity, isLoadNewStock) {    var stock = stck.stockInfo;    var tableContent = document.getElementById('tableContent');    var tableContentRowsLength = tableContent.rows.length;    var stockInfoLength = stck.stockInfo.length;    var toIndex = tableContentRowsLength + showQuantity;    if (toIndex > stockInfoLength) {      if (isLoadNewStock && stck.loadStock(10, true, false)) {        return;      } else {        toIndex = stockInfoLength;      }    }    for (var i = tableContentRowsLength, row, rowNumber, cellIndex, SKUCell, descriptionCell, stockCell, clickHandler; i < toIndex; ++i) {      row = tableContent.insertRow(i);      rowNumber = document.createElement('TH');      rowNumber.innerText = i + 1;      row.appendChild(rowNumber);      cellIndex = 0;      SKUCell = row.insertCell(++cellIndex);      SKUCell.innerHTML = stock[i][0];      descriptionCell = row.insertCell(++cellIndex);      descriptionCell.innerHTML = stock[i][1];      stockCell = row.insertCell(++cellIndex);      stockCell.className = 'stock';      stockCell.innerHTML = stock[i][2];      clickHandler = function(row) {        return function() {          stck.loadItemInformation(stock[row][0]);        };      };      row.onclick = clickHandler(i);    }  };    /**   * This code is for test   */  for (var i = 0; i < 10000; ++i) {    stck.stockInfo.push(['TESTSKU', 'A test item', i]);  }  stck.showRow(10000, false)

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<!DOCTYPE html>  <meta charset="utf-8">  <link rel="stylesheet" media="screen" href="/s/master.css">  <link rel="stylesheet" media="screen" href="/s/stock.css">  <title>Existencia | HDX</title>  <body>  <header id="gheader"><nav id="gpanel"><ul id="gnav"><li id="stock"><a href="/76091132/existencia/">Existencia</a></ul><ul id="gmanager">  <li id="user"><a href="/76091132/">Tester</a>  <li id="exit"><a href="/76091132/salir">Salir</a>  </ul>  </nav>  </header><div id="overlay" class="hidden">  <form id="addItemPage" class="hidden">  <h1>Agregar un artículo</h1>  <div class="contentArea">  <p><label>SKU<input type="text" id="newSKUInput" maxlength="20" autocomplete="off"></label>  <p><label>Descripción<input type="text" id="newDescriptionInput" maxlength="100" autocomplete="off"></label>  <p><label>Precio unitario<input type="number" id="newUnitPriceInput" min="1" value="1" autocomplete="off"></label>  </div>  <div class="b">  <input type="submit" value="Agregar"><input type="reset" value="Cancelar">  </div>  </form>  </div>  <div id="body"><header>  <div id="functions">  <ul>  <li id="addItemButton">Agregar un artículo  <li id="cancelButton" class="hidden">Cancelar  <li id="saveButton" class="hidden">Guardar  </ul>  </div>  <h1 class="fn">Existencia</h1>  </header>  <div id="tables" tabindex="0">  <table id="tableHeader">  <colgroup>  <col class="indexCol">  <col class="SKUCol">  <col>  <col class="stockCol">  </colgroup>  <thead>  <tr><th>#<th>SKU<th>Descripción<th>Existencia  </thead>  </table>  <table id="tableContent">  <colgroup>  <col class="indexCol">  <col class="SKUCol">  <col>  <col class="stockCol">  </colgroup>  <tbody></tbody>  </table>  </div>  </div>    <div id="editItem">  <header>  <h2>Editar artículo</h2>  <nav>  <ul id="tabsLabels">  <li id="generalTabButton" class="active">General  <li id="stockTabButton">Existencia  <li id="facturationTabButton">Facturación  <li id="optionsTabButton">Opciones  </ul>  </nav>  </header>  <div id="tabsContainer" class="container">  <div id="tabsContents" class="tabs">  <section id="generalTab">  <div>  <table id="inputsTable">  <colgroup>  <col class="labelCol">  </colgroup>  <tr><th><label for="SKUInput">SKU</label><td><input type="text" id="SKUInput" autocomplete="off">  </table>  <table id="descriptionsTable">  <colgroup><col><col class="languageCol"><col class="deleteCol"></colgroup>  <tr><th>Descripción<th>Idioma<th>  <tr id="newDescriptionRow"><td><input type="text" id="descriptionInput" placeholder="Escriba aquí para una descripción nueva en otro idioma" autocomplete="off"><td><select id="languageSelect"><option value="aa">afar<option value="ab">abjaso<option value="ae">avéstico<option value="af">afrikaans<option value="ak">akano<option value="am">amárico<option value="an">aragonés<option value="ar">árabe<option value="as">asamés<option value="av">avar<option value="ay">aimara<option value="az">azerí<option value="ba">baskir<option value="be">bielorruso<option value="bg">búlgaro<option value="bh">bhojpurí<option value="bi">bislama<option value="bm">bambara<option value="bn">bengalí<option value="bo">tibetano<option value="br">bretón<option value="bs">bosnio<option value="ca">catalán<option value="ce">checheno<option value="ch">chamorro<option value="cn">chino<option value="co">corso<option value="cr">cree<option value="cs">checo<option value="cu">eslavo eclesiástico antiguo<option value="cv">chuvasio<option value="cy">galés<option value="da">danés<option value="de">alemán<option value="dv">maldivo<option value="dz">dzongkha<option value="ee">ewe<option value="el">griego<option value="en">inglés<option value="eo">esperanto<option value="es">español<option value="et">estonio<option value="eu">euskera<option value="fa">persa<option value="ff">fula<option value="fi">finés<option value="fj">fiyiano<option value="fo">feroés<option value="fr">francés<option value="fy">frisón<option value="ga">irlandés<option value="gd">gaélico escocés<option value="gl">gallego<option value="gn">guaraní<option value="gu">guyaratí<option value="gv">manés<option value="ha">hausa<option value="he">hebreo<option value="hi">hindi<option value="ho">hiri motu<option value="hr">croata<option value="ht">haitiano<option value="hu">húngaro<option value="hy">armenio<option value="hz">herero<option value="ia">interlingua<option value="id">indonesio<option value="ie">occidental<option value="ig">igbo<option value="ii">yi de Sichuán<option value="ik">inupiaq<option value="io">ido<option value="is">islandés<option value="it">italiano<option value="iu">inuktitut<option value="ja">japonés<option value="jv">javanés<option value="ka">georgiano<option value="kg">kongo<option value="ki">kikuyu<option value="kj">kuanyama<option value="kk">kazajo<option value="kl">groenlandés<option value="km">camboyano<option value="kn">canarés<option value="ko">coreano<option value="kr">kanuri<option value="ks">cachemiro<option value="ku">kurdo<option value="kv">komi<option value="kw">córnico<option value="ky">kirguís<option value="la">latín<option value="lb">luxemburgués<option value="lg">luganda<option value="li">limburgués<option value="ln">lingala<option value="lo">lao<option value="lt">lituano<option value="lu">luba-katanga<option value="lv">letón<option value="mg">malgache<option value="mh">marshalés<option value="mi">maorí<option value="mk">macedonio<option value="ml">malayalam<option value="mn">mongol<option value="mr">maratí<option value="ms">malayo<option value="mt">maltés<option value="my">birmano<option value="na">nauruano<option value="nb">noruego bokmål<option value="nd">ndebele del norte<option value="ne">nepalí<option value="ng">ndonga<option value="nl">neerlandés<option value="nn">nynorsk<option value="no">noruego<option value="nr">ndebele del sur<option value="nv">navajo<option value="ny">chichewa<option value="oc">occitano<option value="oj">ojibwa<option value="om">oromo<option value="or">oriya<option value="os">osético<option value="pa">panyabí<option value="pi">pali<option value="pl">polaco<option value="ps">pastú<option value="pt">portugués<option value="qu">quechua<option value="rm">retorrománico<option value="rn">kirundi<option value="ro">rumano<option value="ru">ruso<option value="rw">ruandés<option value="sa">sánscrito<option value="sc">sardo<option value="sd">sindhi<option value="se">sami septentrional<option value="sg">sango<option value="sh">serbocroata<option value="si">cingalés<option value="sk">eslovaco<option value="sl">esloveno<option value="sm">samoano<option value="sn">shona<option value="so">somalí<option value="sq">albanés<option value="sr">serbio<option value="ss">suazi<option value="st">sesotho<option value="su">sundanés<option value="sv">sueco<option value="sw">suajili<option value="ta">tamil<option value="te">telugú<option value="tg">tayiko<option value="th">tailandés<option value="ti">tigriña<option value="tk">turcomano<option value="tl">tagalo<option value="tn">setsuana<option value="to">tongano<option value="tr">turco<option value="ts">tsonga<option value="tt">tártaro<option value="tw">twi<option value="ty">tahitiano<option value="ug">uigur<option value="uk">ucraniano<option value="ur">urdu<option value="uz">uzbeko<option value="ve">venda<option value="vi">vietnamita<option value="vo">volapük<option value="wa">valón<option value="wl">walisiano<option value="wo">wolof<option value="xh">xhosa<option value="yi">yídish<option value="yo">yoruba<option value="za">chuan<option value="zh">chino<option value="zu">zulú</select><td>  </table>  </div>  <div>  <table id="inputsTable">  <colgroup>  <col class="labelCol">  </colgroup>  <tr><th>Estado<td><input type="checkbox" id="statusInput" value="1"><label for="statusInput">Activo</label>  <!--<tr><th><label for="departmentSelect">Departamento</label><td><select></select>  <tr><th><label for="categorySelect">Categoría</label><td><select></select>  <tr><th><label for="noteTextArea">Notas</label><td><textarea></textarea>-->  </table>  </div>  </section>  <section id="stockTab">  <div>  <table id="stadisticTable">  <tr><th>Inventario<td>0  <tr><th>Cantidad vendido<td>0  <tr><th>Última fecha de modificación<td>  </table>  </div>  </section>  <section id="facturationTab">  <div>  <table id="pricesTable">  <colgroup><col><col><col><col><col class="deleteCol"></colgroup>  <tr><th>Código<th>Unidad<th>Cantidad equivalente<th>Precio<th>  <tr id="newPriceRow"><td><input type="text" id="codeInput" autocomplete="off"><td><input type="text" id="unitInput" autocomplete="off"><td><input type="text" id="quantityInput" autocomplete="off"><td><input type="text" id="priceInput" autocomplete="off"><td>  </table>  </div>  </section>  <section id="optionsTab">  <p>Imprimir precio  </section>  </div></div>

Is there any solution to this problem?

Answer 1

The first thing that is slowing your loop down is .insertRow(). You're doing this at the top of your loop and then adding cells to it. After the row is added, and after each cell is added, the browser is doing layout calculations. Instead use .createElement() and then .appendChild() at the end of your loop.

Demo: http://jsfiddle.net/ThinkingStiff/gyaGk/

Replace:

row = tableContent.insertRow(i); 

With:

row = document.createElement('tr'); 

And add this at the end of your loop:

tableContent.tBodies[0].appendChild(row); 

That will solve your loading speed issue. As for the hover, you have way too many CSS rules affecting your tr and td elements using tag selectors. I removed a few, and used classes on a few, and the hover highlighting is much faster. Specifically, I noticed that overflow: hidden on the td elements slowed it down considerably. Consider combining some of your rules, using simpler selectors, and adding classes to elements for quicker CSS processing. During hover many things have to be recalculated by the the layout engine, and the fewer CSS rules the better. One example I saw in your code was #tables tbody tr when there was only one tbody in the table. #tables tr would have sufficed. Better than either of those is a class. I used .row in my demo.

Best practices from Google Page Speed:

• Avoid descendant selectors: table tbody tr td
• Avoid redundant ancestors: body section article (body never needed)
• Avoid universal (*) selectors: body *
• Avoid tag selectors as the key (right-most): ul li
• Avoid child or adjacent selectors: ul > li > a
• Avoid overly qualified selectors: form#UserLogin (# is already specific)
• Make your rules as specific as possible (class or id).