Data Visualization Workshop - Enter and Append

Sections:

enter:

Returns the enter selection: placeholder nodes for each datum that had no corresponding DOM element in the selection.
The enter selection is empty for selections not returned by selection.data.
The enter selection is typically used to create “missing” elements corresponding to new data.
For example, to create DIV elements from an array of numbers:

const div = d3.select("body")
  .selectAll("div")
  .data([4, 8, 15, 16, 23, 42])
  .enter().append("div")
    .text(d => d);

If the body is initially empty, the above code will create six new DIV elements, append them to the body in-order, and assign their text content as the associated (string-coerced) number:

<div>4</div>
<div>8</div>
<div>15</div>
<div>16</div>
<div>23</div>
<div>42</div>

Click Fork Button to Play with this on your own

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