Data grid footers

Footers in Jspreadsheet allow you to display information or calculations at the bottom of a data grid. This section provides instructions for implementing footers during initialization or runtime using programming techniques.

Documentation

Methods

The following methods provide programmatic interaction with the footers of the Jspreadsheet data grid.
MethodDescription
getFooter() Get the current footer settings.
getFooter() : Array
setFooter() Set the footer settings.
setFooter(newValue: Array) : void
resetFooter() Reset and remove the footers.
resetFooter() : void
refreshFooter() Recalculate the values in the footer.
refreshFooter() : void
getFooterValue(number, number) Get the current footer cell value from the coordinates x, y.
getFooterValue(x: Number, y: Number) : void
setFooterValue(number, number, string) Set the value of a footer cell to the coordinates x, y.
setFooterValue(x: Number, y: Number, value: String) : void


Events

The following events allow you to intercept user interactions with the Jspreadsheet data grid.
EventDescription
onchangefooter This method is invoked when the footers undergo modification in the Jspreadsheet data grid.
onchangefooter(worksheet: Object, newValue: String, oldValue: String) : null
onchangefootervalue This method is called when the values of the footers in the Jspreadsheet data grid are modified.
onchangefootervalue(worksheet: Object, x: Number, y: Number, newValue: String) : null
onrenderfootercell
This method is called when a footer cell is rendered. onrenderfootercell(worksheet: Object, x: Number, y: Number, newValue: String, td: HTMLElement) : null


Initial Settings

The following property is available during the initialization of the Jspreadsheet online spreadsheet.
PropertyDescription
footers: string[]Footers definitions


Examples

Basic footer usage

In the example below the custom SUMCOL formula is implemented to consider only visible rows in the calculations.

Programmatic updates

How to change the formulas in the footers after the initialization.





JavaScript example

<html>
<script src="https://jspreadsheet.com/v10/jspreadsheet.js"></script>
<script src="https://jsuites.net/v5/jsuites.js"></script>
<link rel="stylesheet" href="https://jsuites.net/v5/jsuites.css" type="text/css" />
<link rel="stylesheet" href="https://jspreadsheet.com/v10/jspreadsheet.css" type="text/css" />

<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons" />

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

<input type='button' value='Change to AVERAGE' onclick='update()'>

<script>
// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('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');

var update = function() {
    worksheets[0].setFooterValue(0,0,'Avarage');
    worksheets[0].setFooterValue(1,0,'=AVERAGE(B:B)');
    worksheets[0].setFooterValue(2,0,'=AVERAGE(C:C)');
}

// Create the spreadsheet
var worksheets = jspreadsheet(document.getElementById('spreadsheet'), {
    worksheets: [{
        data: [
            ['Cheese', 10, 6.00],
            ['Apples', 5, 4.00],
            ['Carrots', 5, 1.00],
            ['Oranges', 6, 2.00],
        ],
        footers: [
            [
                'Total',
                '=SUM(B:B)',
                '=SUM(C:C)',
            ]
        ],
        columns: [
            { width:'400px' }
        ]
    }],
    onrenderfootercell: function(worksheet, x, y, value, td) {
        if (value && x > 0) {
            // Applying a mask to the footer value
            td.innerText = jSuites.mask.render(value, { mask: '$ #,##0.00'}, true);
        }
    }
});
</script>
</html>

React example

import React, { useRef } from "react";
import { Spreadsheet, Worksheet } from "@jspreadsheet/react";
import jSuites from "jsuites";
import formula from "@jspreadsheet/formula";

// License
jspreadsheet.setLicense('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');

// Load the formula pro extension
jspreadsheet.setExtensions({ formula });

// Create a new data grid
export default function App() {
    // Spreadsheet array of worksheets
    const spreadsheet = useRef();
    // Data
    const data = [
        ['Cheese', 10, 6.00, "=B1*C1"],
        ['Apples', 5, 4.00, "=B2*C2"],
        ['Carrots', 5, 1.00, "=B3*C3"],
        ['Oranges', 6, 2.00, "=B4*C4"],
    ];
    // Columns
    const columns = [
        { width:'400px' }
    ];
    // Data grid cell definitions
    const footers = [
        [
            'Total',
            '=SUM(B:B)',
            '=SUM(C:C)',
        ]
    ];
    // Event
    const onrenderfootercell = (worksheet, x, y, value, td) => {
        if (value && x > 0) {
            // Applying a mask to the footer value
            td.innerText = jSuites.mask.render(value, { mask: '$ #,##0.00'}, true);
        }
    }
    // Update
    const update = () => {
        spreadsheet.current[0].setFooterValue(0,0,'Avarage');
        spreadsheet.current[0].setFooterValue(1,0,'=AVERAGE(B:B)');
        spreadsheet.current[0].setFooterValue(2,0,'=AVERAGE(C:C)');
    }
    // Render data grid component
    return (
        <Spreadsheet ref={spreadsheet} onrenderfootercell={onrenderfootercell}>
            <Worksheet data={data} columns={columns} footers={footers}  />
        </Spreadsheet>
        <input type='button' value='Change to AVERAGE' onClick={()=>update()}'>
    );
}

Vue example

<template>
    <Spreadsheet ref="spreadsheet" :onrenderfootercell="onrenderfootercell">
        <Worksheet :data="data" :columns="columns" :footers="footers"  />
    </Spreadsheet>
    <button type="button" @click="update">Update</button>
</template>

<script>
import { Spreadsheet, Worksheet } from "@jspreadsheet/vue";

const license = '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';

export default {
    components: {
        Spreadsheet,
        Worksheet,
    },
    methods: {
        update() {
            this.$refs.spreadsheet.current[0].setFooterValue(0,0,'Avarage');
            this.$refs.spreadsheet.current[0].setFooterValue(1,0,'=AVERAGE(B:B)');
            this.$refs.spreadsheet.current[0].setFooterValue(2,0,'=AVERAGE(C:C)');
        },
        // Event
        onrenderfootercell(worksheet, x, y, value, td) {
            if (value && x > 0) {
                // Applying a mask to the footer value
                td.innerText = jSuites.mask.render(value, { mask: '$ #,##0.00'}, true);
            }
        }
    },
    data() {
        // Data
        const data = [
            ['Cheese', 10, 6.00, "=B1*C1"],
            ['Apples', 5, 4.00, "=B2*C2"],
            ['Carrots', 5, 1.00, "=B3*C3"],
            ['Oranges', 6, 2.00, "=B4*C4"],
        ];
        // Columns
        const columns = [
            { width:'400px' }
        ];
        // Data grid cell definitions
        const footers = [
            [
                'Total',
                '=SUM(B:B)',
                '=SUM(C:C)',
            ]
        ];

        return {
            data,
            columns,
            footers,
            license,
        };
    }
}
</script>

Angular example

import { Component, ViewChild, ElementRef } from "@angular/core";
import * as jspreadsheet from "jspreadsheet";

// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('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');

// Create component
@Component({
    selector: "app-root",
    template: `<div #spreadsheet></div>
        <button type="button" (click)="toogle">Update</button>`;
})
export class AppComponent {
    @ViewChild("spreadsheet") spreadsheet: ElementRef;
    // Worksheets
    worksheets: jspreadsheet.worksheetInstance[];
    // Create a new data grid
    ngOnInit() {
        // Create spreadsheet
        this.worksheets = jspreadsheet(this.spreadsheet.nativeElement, {
        worksheets: [{
                data: [
                    ['Cheese', 10, 6.00],
                    ['Apples', 5, 4.00],
                    ['Carrots', 5, 1.00],
                    ['Oranges', 6, 2.00],
                ],
                footers: [
                    [
                        'Total',
                        '=SUM(B:B)',
                        '=SUM(C:C)',
                    ]
                ],
                columns: [
                    { width:'400px' }
                ]
            }],
            onrenderfootercell: function(worksheet, x, y, value, td) {
                if (value && x > 0) {
                    // Applying a mask to the footer value
                    td.innerText = jSuites.mask.render(value, { mask: '$ #,##0.00'}, true);
                }
            }
        });
    }
    update() {
        this.worksheets[0].setFooterValue(0,0,'Avarage');
        this.worksheets[0].setFooterValue(1,0,'=AVERAGE(B:B)');
        this.worksheets[0].setFooterValue(2,0,'=AVERAGE(C:C)');
    }
}


Cross footer calculations

Footers are used to hold static information, but the following example creates a complete cross-footer calculations with realtime updates using onafterchanges. See our cross spreadsheet footer calculations on jsfiddle








JavaScript example

<html>
<script src="https://jspreadsheet.com/v10/jspreadsheet.js"></script>
<script src="https://jsuites.net/v5/jsuites.js"></script>
<link rel="stylesheet" href="https://jsuites.net/v5/jsuites.css" type="text/css" />
<link rel="stylesheet" href="https://jspreadsheet.com/v10/jspreadsheet.css" type="text/css" />

<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons" />

<div id="spreadsheet1"></div><br>
<div id="spreadsheet2"></div><br>
<div id="spreadsheet3"></div><br>

<script>
// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('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');

// Create the spreadsheet
var s1 = jspreadsheet(document.getElementById('spreadsheet1'), {
    worksheets: [{
        worksheetName: 'JSS1',
        data: [
            [43, 64],
            [51, 46],
        ],
        footers: [
            ['=SUM(A:A)']
        ],
    }],
    onafterchanges: function () {
        s3[0].setFooter();
    }
});

// Create the spreadsheet
var s2 = jspreadsheet(document.getElementById('spreadsheet2'), {
    worksheets: [{
        worksheetName: 'JSS2',
        data: [
            [34, 53],
            [51, 35],
        ],
        footers: [
            ['=SUM(A:A)']
        ],
    }],
    onafterchanges: function () {
        s3[0].setFooter();
    }
});

// Create the spreadsheet
var s3 = jspreadsheet(document.getElementById('spreadsheet3'), {
    worksheets: [{
        worksheetName: 'JSS3',
        data: [
            [34, 53],
            [51, 35],
        ],
        footers: [
            ['=SUM(JSS1!A:A,JSS2!A:A,JSS3!A:A)']
        ],
    }],
    onafterchanges: function () {
        s3[0].setFooter();
    }
});
</script>
</html>

React example

import React, { useRef } from "react";
import { Spreadsheet, Worksheet, jspreadsheet } from "@jspreadsheet/react";
import formula from "@jspreadsheet/formula";

// License
jspreadsheet.setLicense('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');

// Load the formula pro extension
jspreadsheet.setExtensions({ formula });

// Create a new data grid
export default function App() {
    // Spreadsheet array of worksheets
    const spreadsheet = useRef();

    // Update footers from the last data grid
    const onafterchanges = function () {
        s3[0].setFooter();
    }

    const s1 = [{
        worksheetName: 'JSS1',
        data: [
            [43, 64],
            [51, 46],
        ],
        footers: [
            ['=SUM(A:A)']
        ],
    }]

    const s2 = [{
        worksheetName: 'JSS2',
        data: [
            [34, 53],
            [51, 35],
        ],
        footers: [
            ['=SUM(A:A)']
        ],
    }]

    const s3 = [{
        worksheetName: 'JSS3',
        data: [
            [34, 53],
            [51, 35],
        ],
        footers: [
            ['=SUM(JSS1!A:A,JSS2!A:A,JSS3!A:A)']
        ],
    }]

    // Render data grid component
    return (
        <Spreadsheet worksheets={s1} onafterchanges={onafterchanges} />
        <Spreadsheet worksheets={s2} onafterchanges={onafterchanges} />
        <Spreadsheet worksheets={s3} onafterchanges={onafterchanges} />
    );
}

Vue example

<template>
    <Spreadsheet :worksheets="s1" :onafterchanges="onafterchanges" />
    <Spreadsheet :worksheets="s2" :onafterchanges="onafterchanges" />
    <Spreadsheet :worksheets="s3" :onafterchanges="onafterchanges" />
</template>

<script>
import { Spreadsheet, Worksheet, jspreadsheet } from "@jspreadsheet/vue";
import formula from "@jspreadsheet/formula";

// License
jspreadsheet.setLicense('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');

// Load the formula pro extension
jspreadsheet.setExtensions({ formula });

export default {
    components: {
        Spreadsheet,
        Worksheet,
    },
    methods: {
        // Update footers from the last data grid
        onafterchanges() {
            s3[0].setFooter();
        }
    },
    data() {
        const s1 = [{
            worksheetName: 'JSS1',
            data: [
                [43, 64],
                [51, 46],
            ],
            footers: [
                ['=SUM(A:A)']
            ],
        }]

        const s2 = [{
            worksheetName: 'JSS2',
            data: [
                [34, 53],
                [51, 35],
            ],
            footers: [
                ['=SUM(A:A)']
            ],
        }]

        const s3 = [{
            worksheetName: 'JSS3',
            data: [
                [34, 53],
                [51, 35],
            ],
            footers: [
                ['=SUM(JSS1!A:A,JSS2!A:A,JSS3!A:A)']
            ],
        }]

        return {
            s1,
            s2,
            s3,
        };
    }
}
</script>

Angular example

import { Component, ViewChild, ElementRef } from "@angular/core";
import * as jspreadsheet from "jspreadsheet";

// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('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');

// Create component
@Component({
    selector: "app-root",
    template: `
        <div #spreadsheet1></div>
        <div #spreadsheet2></div>
        <div #spreadsheet3></div>
    `;
})
export class AppComponent {
    @ViewChild("spreadsheet1") spreadsheet1: ElementRef;
    @ViewChild("spreadsheet2") spreadsheet2: ElementRef;
    @ViewChild("spreadsheet3") spreadsheet3: ElementRef;
    // Worksheets
    s1: jspreadsheet.worksheetInstance[];
    s2: jspreadsheet.worksheetInstance[];
    s3: jspreadsheet.worksheetInstance[];
    // Create a new data grid
    ngOnInit() {
        // Create the spreadsheet
        this.s1 = jspreadsheet(this.spreadsheet1.nativeElement, {
            worksheets: [{
                worksheetName: 'JSS1',
                data: [
                    [43, 64],
                    [51, 46],
                ],
                footers: [
                    ['=SUM(A:A)']
                ],
            }],
            onafterchanges: () => () {
                this.s3[0].setFooter();
            }
        });

        // Create the spreadsheet
        this.s2 = jspreadsheet(this.spreadsheet2.nativeElement, {
            worksheets: [{
                worksheetName: 'JSS2',
                data: [
                    [34, 53],
                    [51, 35],
                ],
                footers: [
                    ['=SUM(A:A)']
                ],
            }],
            onafterchanges: () => () {
                this.s3[0].setFooter();
            }
        });

        // Create the spreadsheet
        this.s3 = jspreadsheet(this.spreadsheet3.nativeElement, {
            worksheets: [{
                worksheetName: 'JSS3',
                data: [
                    [34, 53],
                    [51, 35],
                ],
                footers: [
                    ['=SUM(JSS1!A:A,JSS2!A:A,JSS3!A:A)']
                ],
            }],
            onafterchanges: () => {
                this.s3[0].setFooter();
            }
        });
    }
}