Exploring data elements using iteration in JavaScript

Here is some code that is functioning properly:

 Morris.Bar({
            element: 'barchart',
            axes: true,
            data: [ json.bar.bar1 ],
            xkey: 'x',
            ykeys: ['y', 'z', 'a'],
            labels: ['Facebook', 'LinkedIn', 'Google+'],
            barColors: ['#707f9b', '#455064', '#242d3c']
        });

This is the JSON data:

{
"bar"  : 
{
"bar1" :    {
   "x" : "2013 Q1",
   "y" : "9",
   "z" : "6",
   "a" : "8"
        },
"bar2" :    {
   "x" : "2013 Q2",
   "y" : "5",
   "z" : "7",
   "a" : "3"
        },
"bar3" :    {
   "x" : "2013 Q3",
   "y" : "8",
   "z" : "9",
   "a" : "6"
        },
"bar4" :    {
   "x" : "2013 Q4",
   "y" : "7",
   "z" : "9",
   "a" : "8"
        }
}  
}

However, when attempting to use a loop in the code, it results in syntax errors in Dreamweaver and the output does not display on the webpage.

 Morris.Bar({
            element: 'barchart',
            axes: true,
            data: [
            for(i=1;i<=4;i++)
            {
            json.bar.bar + i + ','
            }
            ],
            xkey: 'x',
            ykeys: ['y', 'z', 'a'],
            labels: ['Facebook', 'LinkedIn', 'Google+'],
            barColors: ['#707f9b', '#455064', '#242d3c']
        });

The desired output should look like this:

Morris.Bar({
            element: 'barchart',
            axes: true,
            data: [ json.bar.bar1,
                    json.bar.bar2,
                    json.bar.bar3,
                    json.bar.bar4 ],
            xkey: 'x',
            ykeys: ['y', 'z', 'a'],
            labels: ['Facebook', 'LinkedIn', 'Google+'],
            barColors: ['#707f9b', '#455064', '#242d3c']
        });

Answer №1

Here's a suggested approach:

content: (function() {
    var newArr = [];
    for (j = 1; j <= 5; j++) {
        newArr.push(data.content["item"+j]); //considering the current structure of your data.content object            
    }
    return newArr
})();

If you use an array, data.content, to store your item values, you can simply use newArr.push(data.content[j]) instead (just be cautious about the index values - starting from 0)

Answer №2

It is not possible to include a for loop inside an array.

The correct approach is to execute it outside of the array.

Alternatively, in ECMAScript5, you can achieve this using:

data: Object.keys(json.bar).map(function(key) {return json.bar[key]}),

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