Generating JSON data on the fly using D3.js scripting

Question

Generating JSON data on the fly using D3.js scripting

I am attempting to create a JSON object dynamically by pulling data from an array in D3 JavaScript. (The code below is not the exact one I used, but similar)

 let radius = [10,20,30];
   let jsonradius = '[{';
   for (let i = 0; i < radius.length; i++) {
       jsonradius += '"radius":';  
       jsonradius += 'radius[i]';
       jsonradius += ',';
   }
   jsonradius += '}]';

By using flags, I ensure that a comma is not placed after the last entry, resulting in a perfectly formatted JSON when printed using the text(jsonradius) function.

'[{"radius":10,"radius":20,"radius":30}]'

However, when I try to access it as shown below, no value is returned.

'd3.selectAll("circle").data(jsonradius).enter().select("circle").attr("r",function(d){return d.radius;});'

I am new to D3 and JavaScript. Please guide me on how to build JSON objects dynamically.

javascript json dynamic d3.js

Answer 1

Answer №1

The JSON data you provided has 3 fields that share the same name, which is incorrect. A correct format would be similar to this:

'[{"radius":10},{"radius":20},{"radius":30}]'

Answer 2

The JSON data you provided has 3 fields that share the same name, which is incorrect. A correct format would be similar to this:

'[{"radius":10},{"radius":20},{"radius":30}]'

Answer 3

Answer №2

If you're using d3, there's no need to convert your data to JSON just to access it.

You can achieve what you want directly with the radius array:

d3.selectAll("circle").data([15, 25, 35]) // Insert your array values here
  .enter()
  .append('circle')  // Make sure it's not .select('circle')
  .attr('r', function (d) { return d; })
  // add any other necessary attributes.

And if you ever need to convert strings to JSON or vice versa, you can utilize JSON.stringify:

jsonRadius = JSON.stringify(radius.map(function (r) { return { radius: r }; }));

Answer 4

If you're using d3, there's no need to convert your data to JSON just to access it.

You can achieve what you want directly with the radius array:

d3.selectAll("circle").data([15, 25, 35]) // Insert your array values here
  .enter()
  .append('circle')  // Make sure it's not .select('circle')
  .attr('r', function (d) { return d; })
  // add any other necessary attributes.

And if you ever need to convert strings to JSON or vice versa, you can utilize JSON.stringify:

jsonRadius = JSON.stringify(radius.map(function (r) { return { radius: r }; }));

Answer 5

Answer №3

It is not advisable to construct JSON through concatenation as it may lead to unexpected results. Depending on how you handle the string, it could introduce vulnerabilities in your code. Utilize the browser's JSON encoder instead...

radius = [10,20,30];
data = radius.map(function(d){return {radius: d};});
JSON.stringify(data);

This method is compatible with

IE8+
Firefox 3.1+
Safari 4.0.3+
Opera 10.5+
For other browsers, refer to Can I Use

If you need to cater to a browser lacking native parsing support, consider using a reliable solution for encoding to ensure proper sanitization. An example is json2.js, which can detect the absence of a native solution and provide its own if necessary.

Answer 6

It is not advisable to construct JSON through concatenation as it may lead to unexpected results. Depending on how you handle the string, it could introduce vulnerabilities in your code. Utilize the browser's JSON encoder instead...

radius = [10,20,30];
data = radius.map(function(d){return {radius: d};});
JSON.stringify(data);

This method is compatible with

IE8+
Firefox 3.1+
Safari 4.0.3+
Opera 10.5+
For other browsers, refer to Can I Use

If you need to cater to a browser lacking native parsing support, consider using a reliable solution for encoding to ensure proper sanitization. An example is json2.js, which can detect the absence of a native solution and provide its own if necessary.

Generating JSON data on the fly using D3.js scripting

Answer №1

Answer №2

Answer №3

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