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Smart Table Scroll

Build 1MM row tables with native scroll bars by reusing and yielding nodes.

Created by @ChrisPolis, originally as a component of Datacomb

For related projects, see: Clusterize.js and fixed-data-table




var table = new SmartTableScroll({

  // DOM element to render to
  el: document.querySelector('#some-table'),
  // Array of objects that will be used to build and update each row
  data: [ { row1Data }, { row2Data } ... ],
  // Function used to calculate the height of each row
  heightFn: function(rowData) { return rowData.hasPicture ? 20 : 10; },
  // Used when first creating dom nodes for each row
  buildRow: function(rowData) {
    var node = document.createElement('div');
      node.innerHTML =
        "<div class='test-col index'>"+rowData.index+"</div>"+
        "<div class='test-col color'>"+rowData.color+"</div>"+
        "<div class='test-col random'>"+rowData.random+"</div>";
    return node;
  // Used to yield an existing row to a new element in `data`
  updateRow: function(rowData, rowEl) {
    rowEl.childNodes[0].textContent = rowData.index;
    rowEl.childNodes[1].textContent = rowData.color;
    rowEl.childNodes[2].textContent = rowData.random;
  // (Optional) How many rows to create nodes for
  //  this needs to be > than the max number of rows that can fit on screen (2x this value seems right)
  //  play around, this will have performance implications
  availableNodes: 200,

// To update the table, pass in new data to `updateData`
table.updateData([ { updatedRow1Data }, { updatedRow2Data } ... ]);

Include smart-table-scroll.css or add the following to your CSS:

.sts-container {
  overflow-y: scroll;
  position: relative;
  /* scroll container also needs a fixed/defined height */
.sts-container .sts-row {
  position: absolute;
.sts-container .sts-bottom-anchor {
  position: absolute;
  height: 1px;
  width: 1px;

Known limitations

Firefox has an issue with top css property greater than ~18,000,000px(more info); the 1,000,000 row demo works with Firefox, but larger tables may not.

To build and test locally

$ npm install
$ npm run build
$ npm run serve
$ open localhost:5050


Build 1MM row tables with native scroll bars by reusing and yielding nodes.




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