d3js: Create select box with optgroup and create a paragraph showing the value of the selection.
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June 1, 2016 18:35
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d3js: Create select box with optgroup and create a paragraph showing the value of the selection.
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| <!DOCTYPE html> | |
| <meta charset='utf-8'> | |
| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <link rel='stylesheet' href='style.css'> | |
| </head> | |
| <body> | |
| <script type='text/javascript' src='script.js'></script> | |
| </body> | |
| </html> |
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| var body = d3.select('body') | |
| var optGroupJSON = [ | |
| { "key" : "Group 1", "value": ["Option 1","Option 2","Option 3"] }, | |
| { "key" : "Group 2", "value": ["Option 4","Option 5","Option 6"] } | |
| ] | |
| body.append('select') | |
| .on('change',function () { | |
| d3.select('body') | |
| .selectAll('p') | |
| .remove() | |
| d3.select('body') | |
| .selectAll('p') | |
| .data([d3.select('select').property('value')]) | |
| .enter() | |
| .append('p') | |
| .text(function (d) { return d }) | |
| }) | |
| .selectAll('optgroup') | |
| .data(optGroupJSON) | |
| .enter() | |
| .append('optgroup') | |
| .attr('label',function (d) { return d.key}) | |
| .selectAll('option') | |
| .data(function (d) { return d.value }) | |
| .enter() | |
| .append('option') | |
| .attr('value',function (d) { return d }) | |
| .text(function (d) { return d }) |
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