Firebase and Chart.js - Data pulled from database into array not displaying in graph

I'm writing code to read in values from my Firebase database, store them into an array, and then plug my array into the Chart.js code to display my data in the graph. But my graph is coming up empty.

First, I create a snapshot of the values in the database, and push them to the new array genderData. I then confirmed that the array was populated with a console.log(genderData) (see below). As far as I can tell, the array was populated:

My console log:
enter image description here

I then console logged outside of my ref call to the database, and it looks like this:

enter image description here

My code to pull data from the database:

var rootRef = firebase.database().ref().child('counters');



// Get counter values.

var genderData = ;



rootRef.once('value').then(function(snapshot){

    genderData.push(snapshot.val()['Male']);

    genderData.push(snapshot.val()['Female']);

    genderData.push(snapshot.val()['Nonbinary']);

    genderData.push(snapshot.val()['Other']);

    genderData.push(snapshot.val()["Didn't Say"]);

    console.log(genderData);

})

console.log(genderData);

Then, I created a regular bar graph with Chart.js, and tried to plug in genderData into the graph:

// Bar graph displaying the total number of students by gender.

var ctx = document.getElementById("myChart4").getContext('2d');

var myChart = new Chart(ctx, {

    type: 'bar',

    data: {

        labels: ["Male", "Female", "Non-Binary", "Other", "Unspecified"],

        datasets: [{

            data: genderData,

            backgroundColor: [

                'rgba(255, 99, 132, 0.2)',

                'rgba(54, 162, 235, 0.2)',

                'rgba(255, 206, 86, 0.2)',

                'rgba(75, 192, 192, 0.2)',

                'rgba(153, 102, 255, 0.2)',

                'rgba(255, 159, 64, 0.2)',

            ],

            borderColor: [

                'rgba(255,99,132,1)',

                'rgba(54, 162, 235, 1)',

                'rgba(255, 206, 86, 1)',

                'rgba(75, 192, 192, 1)',

                'rgba(153, 102, 255, 1)',

                'rgba(255, 159, 64, 1)'

            ],

            borderWidth: 1

        }]

    },

    options: {

        title: {

            display: true,

            text: 'Total Students by Time Taken to Complete Degree'

        },

        legend:{

            display: false

        },

        scales: {

            yAxes: [{

                ticks: {

                    beginAtZero:true

                }

            }]

        }

    }

});

But my graph is empty:

enter image description here

EDIT:

Upon further inspection, I noticed that the values are showing up... kind of.

enter image description here

So it seems that my data just isn't creating the "bar" of the graph? And my y values start at 0.0 and end at 1.0, and I have no idea why.

edited Nov 23 '18 at 13:54

asked Nov 23 '18 at 2:16

gbm0102

395

The code seems to be right, I feel that the logged array looks strange, it has an additional chart_js value in it. A simple array if logged should look like this -> ibb.co/cUQeqV

– Kunal Khivensara
Nov 23 '18 at 5:06

I console logged outside of my call to the database, and updated my post with that log.

– gbm0102
Nov 23 '18 at 13:54

add a comment |

I'm writing code to read in values from my Firebase database, store them into an array, and then plug my array into the Chart.js code to display my data in the graph. But my graph is coming up empty.

My console log:
enter image description here

I then console logged outside of my ref call to the database, and it looks like this:

enter image description here

My code to pull data from the database:

var rootRef = firebase.database().ref().child('counters');



// Get counter values.

var genderData = ;



rootRef.once('value').then(function(snapshot){

    genderData.push(snapshot.val()['Male']);

    genderData.push(snapshot.val()['Female']);

    genderData.push(snapshot.val()['Nonbinary']);

    genderData.push(snapshot.val()['Other']);

    genderData.push(snapshot.val()["Didn't Say"]);

    console.log(genderData);

})

console.log(genderData);

Then, I created a regular bar graph with Chart.js, and tried to plug in genderData into the graph:

// Bar graph displaying the total number of students by gender.

var ctx = document.getElementById("myChart4").getContext('2d');

var myChart = new Chart(ctx, {

    type: 'bar',

    data: {

        labels: ["Male", "Female", "Non-Binary", "Other", "Unspecified"],

        datasets: [{

            data: genderData,

            backgroundColor: [

                'rgba(255, 99, 132, 0.2)',

                'rgba(54, 162, 235, 0.2)',

                'rgba(255, 206, 86, 0.2)',

                'rgba(75, 192, 192, 0.2)',

                'rgba(153, 102, 255, 0.2)',

                'rgba(255, 159, 64, 0.2)',

            ],

            borderColor: [

                'rgba(255,99,132,1)',

                'rgba(54, 162, 235, 1)',

                'rgba(255, 206, 86, 1)',

                'rgba(75, 192, 192, 1)',

                'rgba(153, 102, 255, 1)',

                'rgba(255, 159, 64, 1)'

            ],

            borderWidth: 1

        }]

    },

    options: {

        title: {

            display: true,

            text: 'Total Students by Time Taken to Complete Degree'

        },

        legend:{

            display: false

        },

        scales: {

            yAxes: [{

                ticks: {

                    beginAtZero:true

                }

            }]

        }

    }

});

But my graph is empty:

enter image description here

EDIT:

Upon further inspection, I noticed that the values are showing up... kind of.

enter image description here

So it seems that my data just isn't creating the "bar" of the graph? And my y values start at 0.0 and end at 1.0, and I have no idea why.

edited Nov 23 '18 at 13:54

asked Nov 23 '18 at 2:16

gbm0102

395

The code seems to be right, I feel that the logged array looks strange, it has an additional chart_js value in it. A simple array if logged should look like this -> ibb.co/cUQeqV

– Kunal Khivensara
Nov 23 '18 at 5:06

I console logged outside of my call to the database, and updated my post with that log.

– gbm0102
Nov 23 '18 at 13:54

add a comment |

I'm writing code to read in values from my Firebase database, store them into an array, and then plug my array into the Chart.js code to display my data in the graph. But my graph is coming up empty.

My console log:
enter image description here

I then console logged outside of my ref call to the database, and it looks like this:

enter image description here

My code to pull data from the database:

var rootRef = firebase.database().ref().child('counters');



// Get counter values.

var genderData = ;



rootRef.once('value').then(function(snapshot){

    genderData.push(snapshot.val()['Male']);

    genderData.push(snapshot.val()['Female']);

    genderData.push(snapshot.val()['Nonbinary']);

    genderData.push(snapshot.val()['Other']);

    genderData.push(snapshot.val()["Didn't Say"]);

    console.log(genderData);

})

console.log(genderData);

Then, I created a regular bar graph with Chart.js, and tried to plug in genderData into the graph:

// Bar graph displaying the total number of students by gender.

var ctx = document.getElementById("myChart4").getContext('2d');

var myChart = new Chart(ctx, {

    type: 'bar',

    data: {

        labels: ["Male", "Female", "Non-Binary", "Other", "Unspecified"],

        datasets: [{

            data: genderData,

            backgroundColor: [

                'rgba(255, 99, 132, 0.2)',

                'rgba(54, 162, 235, 0.2)',

                'rgba(255, 206, 86, 0.2)',

                'rgba(75, 192, 192, 0.2)',

                'rgba(153, 102, 255, 0.2)',

                'rgba(255, 159, 64, 0.2)',

            ],

            borderColor: [

                'rgba(255,99,132,1)',

                'rgba(54, 162, 235, 1)',

                'rgba(255, 206, 86, 1)',

                'rgba(75, 192, 192, 1)',

                'rgba(153, 102, 255, 1)',

                'rgba(255, 159, 64, 1)'

            ],

            borderWidth: 1

        }]

    },

    options: {

        title: {

            display: true,

            text: 'Total Students by Time Taken to Complete Degree'

        },

        legend:{

            display: false

        },

        scales: {

            yAxes: [{

                ticks: {

                    beginAtZero:true

                }

            }]

        }

    }

});

But my graph is empty:

enter image description here

EDIT:

Upon further inspection, I noticed that the values are showing up... kind of.

enter image description here

So it seems that my data just isn't creating the "bar" of the graph? And my y values start at 0.0 and end at 1.0, and I have no idea why.

edited Nov 23 '18 at 13:54

asked Nov 23 '18 at 2:16

gbm0102

395

I'm writing code to read in values from my Firebase database, store them into an array, and then plug my array into the Chart.js code to display my data in the graph. But my graph is coming up empty.

My console log:
enter image description here

I then console logged outside of my ref call to the database, and it looks like this:

enter image description here

My code to pull data from the database:

var rootRef = firebase.database().ref().child('counters');



// Get counter values.

var genderData = ;



rootRef.once('value').then(function(snapshot){

    genderData.push(snapshot.val()['Male']);

    genderData.push(snapshot.val()['Female']);

    genderData.push(snapshot.val()['Nonbinary']);

    genderData.push(snapshot.val()['Other']);

    genderData.push(snapshot.val()["Didn't Say"]);

    console.log(genderData);

})

console.log(genderData);

Then, I created a regular bar graph with Chart.js, and tried to plug in genderData into the graph:

// Bar graph displaying the total number of students by gender.

var ctx = document.getElementById("myChart4").getContext('2d');

var myChart = new Chart(ctx, {

    type: 'bar',

    data: {

        labels: ["Male", "Female", "Non-Binary", "Other", "Unspecified"],

        datasets: [{

            data: genderData,

            backgroundColor: [

                'rgba(255, 99, 132, 0.2)',

                'rgba(54, 162, 235, 0.2)',

                'rgba(255, 206, 86, 0.2)',

                'rgba(75, 192, 192, 0.2)',

                'rgba(153, 102, 255, 0.2)',

                'rgba(255, 159, 64, 0.2)',

            ],

            borderColor: [

                'rgba(255,99,132,1)',

                'rgba(54, 162, 235, 1)',

                'rgba(255, 206, 86, 1)',

                'rgba(75, 192, 192, 1)',

                'rgba(153, 102, 255, 1)',

                'rgba(255, 159, 64, 1)'

            ],

            borderWidth: 1

        }]

    },

    options: {

        title: {

            display: true,

            text: 'Total Students by Time Taken to Complete Degree'

        },

        legend:{

            display: false

        },

        scales: {

            yAxes: [{

                ticks: {

                    beginAtZero:true

                }

            }]

        }

    }

});

But my graph is empty:

enter image description here

EDIT:

Upon further inspection, I noticed that the values are showing up... kind of.

enter image description here

So it seems that my data just isn't creating the "bar" of the graph? And my y values start at 0.0 and end at 1.0, and I have no idea why.

javascript arrays firebase firebase-realtime-database chart.js

edited Nov 23 '18 at 13:54

asked Nov 23 '18 at 2:16

gbm0102

395

edited Nov 23 '18 at 13:54

asked Nov 23 '18 at 2:16

gbm0102

395

edited Nov 23 '18 at 13:54

asked Nov 23 '18 at 2:16

gbm0102

395

asked Nov 23 '18 at 2:16

gbm0102

395

asked Nov 23 '18 at 2:16

gbm0102

395

The code seems to be right, I feel that the logged array looks strange, it has an additional chart_js value in it. A simple array if logged should look like this -> ibb.co/cUQeqV

– Kunal Khivensara
Nov 23 '18 at 5:06

I console logged outside of my call to the database, and updated my post with that log.

– gbm0102
Nov 23 '18 at 13:54

add a comment |

The code seems to be right, I feel that the logged array looks strange, it has an additional chart_js value in it. A simple array if logged should look like this -> ibb.co/cUQeqV

– Kunal Khivensara
Nov 23 '18 at 5:06

I console logged outside of my call to the database, and updated my post with that log.

– gbm0102
Nov 23 '18 at 13:54

The code seems to be right, I feel that the logged array looks strange, it has an additional chart_js value in it. A simple array if logged should look like this -> ibb.co/cUQeqV

– Kunal Khivensara
Nov 23 '18 at 5:06

I console logged outside of my call to the database, and updated my post with that log.

– gbm0102
Nov 23 '18 at 13:54

add a comment |

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