Given an HTML document containing JSON data and the task is to convert JSON data into an HTML table.
These are the following approaches for converting the JSON data to an HTML table:
Table of Content
Approach 1: Using for loop
- Take the JSON Object in a variable.
- Call a function that first adds the column names to the < table > element. (It is looking for all columns, which is the UNION of the column names).
- Traverse the JSON data and match the key with the column name. Put the value of that key in the respective column.
- Leave the column empty if there is no value of that key.
Example: This example implements the above approach.
HTML
<!DOCTYPE HTML><html>
<head>
<title>
How to convert JSON data to a
html table using JavaScript ?
</title>
<script src=
</script>
</head>
<body style="text-align:center;" id="body">
<h1 style="color:green;">
GeeksForGeeks
</h1>
<p id="GFG_UP" style="font-size: 15px; font-weight: bold;">
</p>
<button onclick="constructTable('#table')">
click here
</button>
<br><br>
<table align="center" id="table" border="1">
</table>
<script>
let el_up = document.getElementById("GFG_UP");
let list = [
{ "col_1": "val_11", "col_3": "val_13" },
{ "col_2": "val_22", "col_3": "val_23" },
{ "col_1": "val_31", "col_3": "val_33" }
];
el_up.innerHTML = "Click on the button to create "
+ "the table from the JSON data.<br><br>"
+ JSON.stringify(list[0]) + "<br>"
+ JSON.stringify(list[1]) + "<br>"
+ JSON.stringify(list[2]);
function constructTable(selector) {
// Getting the all column names
let cols = Headers(list, selector);
// Traversing the JSON data
for (let i = 0; i < list.length; i++) {
let row = $('<tr/>');
for (let colIndex = 0; colIndex < cols.length; colIndex++) {
let val = list[i][cols[colIndex]];
// If there is any key, which is matching
// with the column name
if (val == null) val = "";
row.append($('<td/>').html(val));
}
// Adding each row to the table
$(selector).append(row);
}
}
function Headers(list, selector) {
let columns = [];
let header = $('<tr/>');
for (let i = 0; i < list.length; i++) {
let row = list[i];
for (let k in row) {
if ($.inArray(k, columns) == -1) {
columns.push(k);
// Creating the header
header.append($('<th/>').html(k));
}
}
}
// Appending the header to the table
$(selector).append(header);
return columns;
}
</script>
</body>
</html>
|
Output:
Output
Approach 2: Using JSON.stringify() method
- Store the JSON object into the variable. and first put all keys in a list.
- Create an element <table> and a <tr> element for the header of the table.
- Visit the keys list and create a <th> for each value and insert it into the <tr> element created for the header.
- Then, for every entry in the object, create a cell and insert it to the particular row.
- Leave the column empty if there is no value of that key.
Example: This example implements the above approach.
HTML
<!DOCTYPE HTML><html>
<head>
<title>
How to convert JSON data to a html
table using JavaScript/jQuery ?
</title>
<script src=
</script>
</head>
<body style="text-align:center;">
<h1 style="color:green;">
GeeksForGeeks
</h1>
<p id="GFG_UP" style="font-size: 15px; font-weight: bold;">
</p>
<button onclick="GFG_FUN()">
click here
</button>
<br><br>
<table id="table" align="center" border="1px"></table>
<script>
let el_up = document.getElementById("GFG_UP");
let list = [
{
"col_1": "val_11", "col_2": "val_12",
"col_3": "val_13"
},
{
"col_1": "val_21", "col_2": "val_22",
"col_3": "val_23"
},
{
"col_1": "val_31", "col_2": "val_32",
"col_3": "val_33"
}
];
el_up.innerHTML = "Click on the button to create the "
+ "table from the JSON data.<br><br>"
+ JSON.stringify(list[0]) + "<br>"
+ JSON.stringify(list[1]) + "<br>"
+ JSON.stringify(list[2]);
function GFG_FUN() {
let cols = [];
for (let i = 0; i < list.length; i++) {
for (let k in list[i]) {
if (cols.indexOf(k) === -1) {
// Push all keys to the array
cols.push(k);
}
}
}
// Create a table element
let table = document.createElement("table");
// Create table row tr element of a table
let tr = table.insertRow(-1);
for (let i = 0; i < cols.length; i++) {
// Create the table header th element
let theader = document.createElement("th");
theader.innerHTML = cols[i];
// Append columnName to the table row
tr.appendChild(theader);
}
// Adding the data to the table
for (let i = 0; i < list.length; i++) {
// Create a new row
trow = table.insertRow(-1);
for (let j = 0; j < cols.length; j++) {
let cell = trow.insertCell(-1);
// Inserting the cell at particular place
cell.innerHTML = list[i][cols[j]];
}
}
// Add the newly created table containing json data
let el = document.getElementById("table");
el.innerHTML = "";
el.appendChild(table);
}
</script>
</body>
</html>
|
Output:
Outout
JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.