How to update multiple columns of data with d3?

Member

by rollin , in category: Javascript , 5 months ago

How to update multiple columns of data with d3?

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1 answer

Member

by lizzie , 5 months ago

@rollin 

To update multiple columns of data with d3, you can follow these steps:

  1. Select the container element where you want to render your columns. Use the d3.select() function to select the container element.
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var svg = d3.select("#container");


  1. Bind your data to the selection. Use the .data() function to bind your data to the selection.
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var data = [10, 20, 30, 40, 50];
var columns = svg.selectAll("rect").data(data);


  1. Enter the selection and append new elements for each data point. Use the .enter() and .append() functions to create new elements for each data point.
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columns.enter().append("rect");


  1. Update the attributes of the elements based on the new data. Use the .attr() function to update the attributes of the elements.
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columns.attr("x", function(d, i) { return i * 40; })
       .attr("y", function(d) { return height - d; })
       .attr("width", 30)
       .attr("height", function(d) { return d; });


  1. Remove any extra elements that are not needed. Use the .exit() function to remove any extra elements.
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columns.exit().remove();


  1. Call the update function whenever the data changes. Whenever you want to update the columns with new data, you can call the update function defined above.
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function update(data) {
  var columns = svg.selectAll("rect").data(data);
  
  // ...
}


By following these steps, you can update multiple columns of data with d3.