How to make HTML table expand on click?

Question

I am rendering HTML table with the help of JavaScript. I have made the table successfully, but now I have one requirement to show some new data in a row like on click expand

Answer 1

Pass "the row was clicked" or "the row we want to add some rows after" to the expand function

td.addEventListener('click', function(){
    expand(row);
});

Then just expand new rows using:

function insertAfter(elm, newElm) {
    elm.parentNode.insertBefore(newElm, elm.nextSibling);
}

Sample code down below:

function format(number, decimals = 2, locale = 'en-in') {
  const fixed = parseInt(number).toFixed(decimals);
  const [int, dec] = fixed.split('.')
  const intFormatted = (+int).toLocaleString(locale)
  return intFormatted + (dec ? '.' + dec : '');
}
var data = [{
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Khara Boondhi-L",
    "transactionType": "TransferIn",
    "netamount": 980
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Samosa-L",
    "transactionType": "TransferIn",
    "netamount": 130
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Bakery FG",
    "itemname": "Corn Flakes Masala-L",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Plum Cake 250gm",
    "transactionType": "TransferIn",
    "netamount": 110
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Butterscotch Cake",
    "transactionType": "TransferIn",
    "netamount": 720
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Chocolate chips cake",
    "transactionType": "TransferIn",
    "netamount": 40000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Mango Delight Cake",
    "transactionType": "TransferIn",
    "netamount": 14000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Almond Honey Chocolate Cake",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Peach Cake",
    "transactionType": "TransferIn",
    "netamount": 5500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Pastry & Cake FG",
    "itemname": "Black Forest Cake",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Crazy Boom",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Hot Chocolate Fudge",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Chocolate Sugar Free Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 1000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Kesar Badam Falooda",
    "transactionType": "TransferIn",
    "netamount": 4430
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Strawberry Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 1231
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Chocochips",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cheese Cake Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 500
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Sundae Large",
    "transactionType": "TransferIn",
    "netamount": 2350
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Mango Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 8000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Shooting Star",
    "transactionType": "TransferIn",
    "netamount": 2360
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Ice Blue Sundae",
    "transactionType": "TransferIn",
    "netamount": 2340
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Creamy Litchi Boom",
    "transactionType": "TransferIn",
    "netamount": 2200
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cookies Ice-cream",
    "transactionType": "TransferIn",
    "netamount": 7000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "TOP- Wafer",
    "transactionType": "TransferIn",
    "netamount": 88000
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Litchi cherry Sundae",
    "transactionType": "TransferIn",
    "netamount": 2440
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Peach Malaba",
    "transactionType": "TransferIn",
    "netamount": 2230
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "Ice Cream FG",
    "itemname": "Cherry Mania Ice-Cream",
    "transactionType": "TransferIn",
    "netamount": 2700
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "North Indian FG",
    "itemname": "Fruit Mixture",
    "transactionType": "TransferIn",
    "netamount": 324
  },
  {
    "outlet": "JAYANAGAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 476426
  },
  {
    "outlet": "KOLAR",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 115313
  },
  {
    "outlet": "MALLESHWARAM",
    "brandname": "NA",
    "itemname": "NA",
    "transactionType": "Sales",
    "netamount": 92141
  }
]
let formatData = function(data) {
  let brandnames = [];
  let itemnames = [];
  let outlets = [];
  data.forEach(element => {
    if (brandnames.indexOf(element.brandname) == -1 && (element.brandname) !== "NA") { //taking brandname which do not have bradname===NA
      brandnames.push(element.brandname);
    }
    if (itemnames.indexOf(element.itemname) == -1 && (element.itemname) !== "NA") { //taking itemname which do not have bradname===NA
      itemnames.push(element.itemname);
    }
    if (outlets.indexOf(element.outlet) == -1) {
      outlets.push(element.outlet);
    }
  });
  return {
    data: data,
    brandnames: brandnames,
    itemnames: itemnames,
    outlets: outlets,
  };
};
var totalSalesPercentage = '';
var olWiseSalesPercentage = '';
let renderTable = function(data) {
  brandnames = data.brandnames;
  itemnames = data.itemnames;
  outlets = data.outlets;
  data = data.data;
  let tbl = document.getElementById("ConsumptionTable");
  let table = document.createElement("table");
  let thead = document.createElement("thead");
  let headerRow = document.createElement("tr");
  let th = document.createElement("th");

  th = document.createElement("th");
  th.innerHTML = "Brand Name";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  let grandTotal = 0;
  let grandNetAmount = 0;
  let outletWiseTotal = {};
  let outletWiseNetamount = {};
  th = document.createElement("th");
  th.colSpan = 2;
  th.innerHTML = "Total";
  th.classList.add("text-center");
  headerRow.appendChild(th);

  outlets.forEach(element => {

    th = document.createElement("th");
    th.colSpan = 2;
    th.innerHTML = element; // populating outlet 
    th.classList.add("text-center");
    headerRow.appendChild(th);
    outletWiseTotal[element] = 0;
    data.forEach(el => {
      if (el.outlet == element && el.brandname !== "NA") { //taking brandname which do not have bradname===NA
        outletWiseTotal[element] += parseInt(el.netamount); //here i am calculating the outletWiseTotal where transcationType==TransferIn

      }
      if (el.outlet == element && el.brandname == "NA" && el.transactionType == "Sales") { //taking brandname which do not have bradname===NA
        outletWiseNetamount[element] = parseInt(el.netamount) || 0


      }

    });
    grandTotal += outletWiseTotal[element]; //then calculating grand total to populate it into  Total column at grn entery

    grandNetAmount += outletWiseNetamount[element] || 0

  });

  thead.appendChild(headerRow);
  headerRow = document.createElement("tr");
  th = document.createElement("th");
  th.innerHTML = "";
  headerRow.appendChild(th);

  for (i = 0; i < outlets.length + 1; i++) {
    th = document.createElement("th");
    th.innerHTML = "Sales";
    th.classList.add("text-center");
    headerRow.appendChild(th);

    th = document.createElement("th");
    th.innerHTML = "Grn Entery";
    th.classList.add("text-center");
    headerRow.appendChild(th);
  }

  headerRow.insertBefore(th, headerRow.children[1]);
  thead.appendChild(headerRow);
  table.appendChild(thead);

  headerRow = document.createElement("tr");
  td = document.createElement("th");
  td.innerHTML = "Total";
  td.classList.add("text-center");
  headerRow.appendChild(td);
  let el1 = 0;
  outlets.forEach(element => {

    td = document.createElement("th");
    td.innerHTML = outletWiseTotal[element].toLocaleString('en-IN');
    td.classList.add("text-right");
    headerRow.appendChild(td);
    if (element.outlet == element) {
      el1 = element.netAmount;
    }
    td = document.createElement("th");
    td.innerHTML = outletWiseNetamount[element].toLocaleString('en-IN') || 0;
    td.classList.add("text-right");
    headerRow.appendChild(td);

  });
  td = document.createElement("th");
  td.innerHTML = grandNetAmount.toLocaleString('en-IN');
  td.classList.add("text-right");
  headerRow.insertBefore(td, headerRow.children[1]);

  td = document.createElement("th");
  td.innerHTML = grandTotal.toLocaleString('en-IN');
  td.classList.add("text-right");
  headerRow.insertBefore(td, headerRow.children[1]);
  thead.appendChild(headerRow);
  table.appendChild(thead);

  let tbody = document.createElement("tbody");
  brandnames.forEach(element => {
    let row = document.createElement("tr");

    td = document.createElement("td");
    td.innerHTML = ' ' + " " + element; //creating plus font icon to make click happen
    
    /*  
     * Pass the row was clicked to the expand function
     */
    td.addEventListener('click', function(){
      expand(row);
    });

    row.appendChild(td);
    let total = 0;
    let totalBCount = 0;
    outlets.forEach(outlet => {
      let el = 0;
      let bc = 0;
      data.forEach(d => {
        if (d.brandname == element && d.outlet == outlet) {
          total += parseInt(d.netamount);
          el = d.netamount;
          console.log(el) //this one is populating ful data here
        }
      });
      console.log(el) //but here it is not taking cumulative sum of netamount it is only taking one amount of each brand 
      olWiseSalesPercentage = (el / outletWiseTotal[outlet]) * 100 || 0 //here doing some calculations
      td = document.createElement("td");
      td.innerHTML = el.toLocaleString('en-IN');

      td.classList.add("text-right");
      row.appendChild(td);
      td = document.createElement("td");
      td.innerHTML = olWiseSalesPercentage.toFixed(2) + "%";

      td.classList.add("text-right");
      row.appendChild(td);
    });
    totalSalesPercentage = (total / grandTotal) * 100 //here doing some calculations
    const totalSalesPercentageFix = totalSalesPercentage.toFixed(2) + "%"
    td = document.createElement("td");
    td.innerHTML = totalSalesPercentageFix;
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);

    td = document.createElement("td");
    td.innerHTML = total.toLocaleString('en-IN');
    td.classList.add("text-right");
    row.insertBefore(td, row.children[1]);
    tbody.appendChild(row);
  });
  table.appendChild(tbody);
  tbl.innerHTML = "";
  tbl.appendChild(table);
  table.classList.add("table");
  table.classList.add("table-striped");
  table.classList.add("table-bordered");
  table.classList.add("table-hover");

}
let formatedData = formatData(data);
renderTable(formatedData);

/*  
 * Insert newElm after elm
 */
function insertAfter(elm, newElm) {
  elm.parentNode.insertBefore(newElm, elm.nextSibling);
}

/*  
 * Add detail row after clicked row
 */
function expand(row) {
    let detailRow = document.createElement("tr");
    let td = document.createElement("td");
    td.colSpan = 9;
    td.innerHTML = "Detail row goes here";
    detailRow.appendChild(td);
    insertAfter(row, detailRow);
}

#test {
  color: green;
  cursor: pointer;
}