如何对我的HTML表格进行排序

Question

I have generic data that I built html table from it using Javascript only like this:

HTML:

<div id="container"></div>

Javascript:

var dataset  = [ { "field1":"val1", "field2":"val2", "field3":"val3" }, { "field1":"val4", "field2":"val5", "field3":"val6", "field4":"val7" } ] ;

function addHeaders(table, keys) {
  var row = table.insertRow();
  for( var i = 0; i < keys.length; i++ ) {
    var cell = row.insertCell();

    cell.appendChild(document.createTextNode(keys[i]));
  }
}

var max_keys = 0;
var max_idx = 0;
for( var i = 0; i < dataset.length; i++ ) {

  var child = dataset[i];

  cur_keys = Object.keys(child).length;
  if (cur_keys > max_keys) {
      max_keys = cur_keys;
      max_idx = i;
  }

}

var table = document.createElement('table');
addHeaders(table, Object.keys(dataset[max_idx]));

for( var i = 0; i < dataset.length; i++ ) {

  var child = dataset[i];

  var row = table.insertRow();
  Object.keys(child).forEach(function(k) {

    var cell = row.insertCell();
    cell.appendChild(document.createTextNode(child[k]));
  })
}

document.getElementById('container').appendChild(table);

How I can allow user to sort the columns ascending and descending ?

jsfiddle

update: sorting code work for strings but not for numeric !!

dataset.sort(function (a, b) {    
  var nameA = Number(a.field2); 
  var nameB = Number(b.field2); 

  return (nameA - nameB);   

});

Answer 1

I would sort the dataset beforehand ( dataset.sort(...) ), and recreate the table rows everytime the sorting order (and dataset) changes.

Or use something that gives this already done for you like Bootstrap tables.

Bootstrap - How to sort table columns

Edit:

Sorting with pure JavaScript:

const dataset  = [ { "field1":1, "field2":"val2", "field3":"val3" }, { "field1":4, "field2":"val5", "field3":"val6", "field4":"val7" } ];

Asc (field1): dataset.sort((a,b) => a.field1 - b.field1)

Desc (field1): dataset.sort((a,b) => b.field1 - a.field1)

Edit2:

If you are working with string, remember to cast them to Number first:

dataset.sort((a,b) => Number(a.field1) - Number(b.field1))