Data Grid Persistence

Jspreadsheet is a frontend tool but has methods, events, and other features to help with the backend data persistence. This section will cover the following points:

Posting data to a remote server
Dealing with record IDs synchronization and sequences
Backend persistence in PHP example
Plugins for persistence

Features

Sequence

Jspreadsheet has an internal sequence for each worksheet. That is automatically incremented and allocated to a row when no record id is defined. It is possible to assign the sequence value to the row through worksheet.setRowId(row, id).

Documentation

Methods

Method	Description
getNextSequence	Get the next sequence number. `getNextSequence() : void`
getRowId	Get the row ID from a row number given. `getRowId(rowNumber: Number) : void`
setRowId	Set the row ID from a row number given. `setRowId(rowNumber: Number, rowId: Number) : void`
getRowById	Get the data from a row, or the row object by id. `getRowById(rowNumber: Number, element: Boolean) : any`
save	Internal method to post a request to the server. The callback is executed when the backend returns a JSON `save(url: String, data: Any, token: String, callback: Function) : void`

Data Grid Events

The onbeforesave event can be used to intercept, change or cancel the user action.

Method	Description
onbeforesave	Executed before a server update request. `onbeforesave(spreadsheet: Object, worksheet: Object, data: Object) : Object` It will return false to cancel the event or the replacement for the original data. Data is the information about the event that requires server persistence.
onsave	It will bring information about the server update request. `onsave(spreadsheet: Object, worksheet: Object, data: Object, result, Object) : void`

Data Grid Settings

Property	Description
On the spreadsheet configuration level
server: string	URL for the server persistence requests. A global URL for all worksheets.
On the worksheet configuration level
persistence: string	URL for the server persistence requests. One URL for each worksheet.
columns.primaryKey: boolean	The primaryKey defines which column will be considered the ID for the records.
rows.id: number	Define the ID for the row

Posting data to a remote server

When the persistence directive is active, an HTTP request happens on each spreadsheet update.

<html>
<script src="https://jspreadsheet.com/v8/jspreadsheet.js"></script>
<script src="https://jsuites.net/v5/jsuites.js"></script>
<link rel="stylesheet" href="https://jspreadsheet.com/v8/jspreadsheet.css" type="text/css" />
<link rel="stylesheet" href="https://jsuites.net/v5/jsuites.css" type="text/css" />

<div id="spreadsheet"></div>

<script>
jspreadsheet(document.getElementById('spreadsheet'), {
    worksheets: [{
        url: '/jspreadsheet/books.json',
        columns: [
            {
                type: 'autonumber',
                width: '50px',
                title: 'Code',
                name: 'id',
                readOnly: true,
                primaryKey: true
            },
            {
                type: 'image',
                width: '80px',
                title: 'Image',
                name: 'thumbnailUrl',
            },
            {
                type: 'text',
                width: '200px',
                title: 'Title',
                name: 'title'
            },
            {
                type: 'text',
                width: '55px',
                title: 'Pages',
                name: 'pageCount'
            },
            {
                type: 'calendar',
                width: '90px',
                title: 'Published',
                name: 'publishedDate'
            },
            {
                type: 'text',
                width: '200px',
                title: 'Author',
                name: 'authors'
            },
            {
                type: 'dropdown',
                width: '180px',
                title: 'Categories',
                name: 'categories',
                source: ['Internet','Web Development', 'Java', 'Mobile', 'Open Source'],
                multiple: true,
                render: 'tag'
            },
        ],
        allowComments:true,
        search: true,
        persistence: '/jspreadsheet/save',
    }],
    updateTable: function(instance, cell, col, row, val, label, cellName) {
        if (col == 1) {
            if (! val) {
                cell.innerHTML = '<img src="https://images-na.ssl-images-amazon.com/images/I/21%2Bwfxx2lyL._SX319_BO1,204,203,200_.jpg" style="width:60px;">';
            }
        }
    }
});
</script>
</html>

Record ID synchronization and sequences

The following example implements a few concepts:

How to load the data with hidden IDs for the user;
Using a custom column to create an icon to perform any action using the record id;
Get the record id from a remote server when a new row is added.

NOTE: the example shows one new line, but you can interact to get more ids if more than one row is added.

<html>
<script src="https://jspreadsheet.com/v8/jspreadsheet.js"></script>
<script src="https://jsuites.net/v5/jsuites.js"></script>
<link rel="stylesheet" href="https://jspreadsheet.com/v8/jspreadsheet.css" type="text/css" />
<link rel="stylesheet" href="https://jsuites.net/v5/jsuites.css" type="text/css" />

<div id="spreadsheet"></div>

<script>
let action = function() {
    let methods = {};
 
    methods.createCell = function(cell, value, x, y, instance, options) {
        let input = document.createElement('i');
        input.className = 'material-icons';
        input.style.cursor = 'pointer';
        input.style.fontSize = '22px';
        input.innerHTML = "search";
        input.onclick = function() {
            let id = instance.getRowId(y);
            // Do some action
            alert(id);
        }
 
        cell.appendChild(input);

        // Readonly
        cell.classList.add('readonly');
    }
 
    return methods;
}();
 
jspreadsheet(document.getElementById('spreadsheet'), {
    worksheets: [{
        data: [
            { id:1, data:['Google', '5', ''] },
            { id:2, data:['Bind', '4', ''] },
            { id:3, data:['Yahoo', '1', ''] },
            { id:4, data:['Duckduckgo', '5', ''] },
        ],
        columns: [
            { type: 'text', width:'400px' },
            { type: 'rating', width:'100px' },
            { type: action, width:'100px' },
        ],
        persistence: '/jspreadsheet/save',
    }],
    oninsertrow: function(a,b,c,d,e) {
        // Inserted before?
        let rowNumber = e == false ? b + 1 : b;
        // Go in remotely get the id and return to the cell
        jSuites.ajax({
            url: '/jspreadsheet/id',
            method: 'GET',
            dataType: 'json',
            success: function(result) {
                // The new id is
                alert('The new row has id: ' + result);
                // set row id
                a.setRowId(rowNumber, result);
            }
        })
    }
});
</script>
</html>

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