How to save JSON data locally (on the machine)?

I am using the following link to create a tree like structure: LINK

This is my code :

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Tree Context Menu - jQuery EasyUI Demo</title>
    <link rel="stylesheet" type="text/css" href="themes/default/easyui.css">
    <link rel="stylesheet" type="text/css" href="themes/icon.css">
    <link rel="stylesheet" type="text/css" href="demo.css">
    <script type="text/javascript" src="jquery.min.js"></script>
    <script type="text/javascript" src="jquery.easyui.min.js"></script>
</head>
<body>
    <h2>Tree Context Menu and Drag Drop Tree Nodes</h2>
    <p>Right click on a node to display context menu.</p>
    <p>Press mouse down and drag a node to another position.</p>
    <div style="margin:20px 0;"></div>
    <div class="easyui-panel" style="padding:5px">
        <ul id="tt" class="easyui-tree" data-options="
                url: 'tree_data1.json',
                method: 'get',
                animate: true,
                dnd:true,
                onContextMenu: function(e,node){
                    e.preventDefault();
                    $(this).tree('select',node.target);
                    $('#mm').menu('show',{
                        left: e.pageX,
                        top: e.pageY
                    });
                }
            ">
        </ul>
    </div>
    <div style="padding:5px 0;">
        <a href="#" class="easyui-linkbutton" onclick="save()" data-options="iconCls:'icon-save'">Save</a>
    </div>
    <div id="mm" class="easyui-menu" style="width:120px;">
        <div onclick="append()" data-options="iconCls:'icon-add'">Append</div>
        <div onclick="removeit()" data-options="iconCls:'icon-remove'">Remove</div>
        <div class="menu-sep"></div>
        <div onclick="expand()">Expand</div>
        <div onclick="collapse()">Collapse</div>
    </div>
    <script type="text/javascript">
        function append(){
            var t = $('#tt');
            var node = t.tree('getSelected');
            t.tree('append', {
                parent: (node?node.target:null),
                data: [{
                    text: 'new item1'
                },{
                    text: 'new item2'
                }]
            });
        }
        function removeit(){
            var node = $('#tt').tree('getSelected');
            $('#tt').tree('remove', node.target);
        }
        function collapse(){
            var node = $('#tt').tree('getSelected');
            $('#tt').tree('collapse',node.target);
        }
        function expand(){
            var node = $('#tt').tree('getSelected');
            $('#tt').tree('expand',node.target);
        }
    function save(){
            var a = document.createElement('a');
        a.setAttribute('href','data:text/plain;charset=utf-u,'+encodeURIComponent(JSON.stringify({$('#tt').html()}));
        a.setAttribute('download', "data.json");

        }
    </script>
</body>
</html>

When I am running this, nothing is getting saved.

I have added a save button to this structure's code.

I want that whenever the user clicks this save button then he could store this tree structure produced as JSON data on his/her local machine. I want this as this tree is editable. How can I do this?

I used the following link for the same:

link

I want that whatever changes that happens to the id = "tt" could be retrieved in the form of JSON and store on my local machine.

Sure this can be done.

Once you have your JSON string (Im assuming you know how to get it because if not that's a different question altogether) you can save it using this function:

function saveText(text, filename){
  var a = document.createElement('a');
  a.setAttribute('href', 'data:text/plain;charset=utf-8,'+encodeURIComponent(text));
  a.setAttribute('download', filename);
  a.click()
}

Call it:

var obj = {a: "Hello", b: "World"};
saveText( JSON.stringify(obj), "filename.json" );

This would prompt the use to save a file named "filename.json", which contains a JSON object of obj

LocalStorage does exactly that.

Use it like this :

localStorage.setItem('myCat', 'Tom');
console.log(localStorage.getItem('myCat')); // Tom

Use can use it to store stringify-ed objects as well :

var obj = { a : 1, b : 2};
localStorage.setItem('myObj', JSON.stringify(obj));
var obj2 = JSON.parse(localStorage.getItem('myObj'));

How to save JSON data locally (on the machine)?

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