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D3.js line.defined() method
  • Last Updated : 19 Aug, 2020

The d3.line.defined() method lets you specify whether there is data defined for a given data point or not. If this method returns false, this means that data point exists, else true.

Syntax:

d3.line.defined(data_point);

Parameters: 

  • data_point: data_point to be checked.

Return Value: This method returns a boolean value.

Example 1: In this example, we will omit some points using this method.



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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<head>
  <title>d3.line.defined()</title>
</head>
<script src=
</script>
  
<body>
    <h1 style="text-align: center; 
               color: green;">
       GeeksforGeeks
    </h1>
  <center>
    <svg id="gfg" width="400" height="400">
      </svg>
</center>
  <script>
var points = [
      {xpoint: 25,  ypoint: 150},
      {xpoint: 75,  ypoint: 85},
      {xpoint: 100, ypoint: 115},
      {xpoint: 125, ypoint: 55},
      {xpoint: 150, ypoint: 105},
      {xpoint: 175, ypoint: 25},
      {xpoint: 200, ypoint: 155},
      {xpoint: 225, ypoint: 15},
      {xpoint: 250, ypoint: 135},
    ];
  
var Gen = d3.line()
  .x((p) => p.xpoint)
  .y((p) => p.ypoint)
  .defined(((d, i) => i != 4));
  
d3.select("#gfg")
  .append("path")
  .attr("d", Gen(points))
  .attr("fill", "none")
  .attr("stroke", "green");
  
</script>
</body>
</html>

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Output:

Example 2: In this example, we will omit null points using this method.

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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<head>
  <title>d3.line.defined()</title>
</head>
<script src=
</script>
  
<body>
    <h1 style="text-align: center;
        color: green;">
        GeeksforGeeks
    </h1>
  <center>
    <svg id="gfg" width="400" height="400">
    </svg>
</center>
  <script>
var points = [
      {xpoint: 25,  ypoint: 150},
      {xpoint: 75,  ypoint: null},
      {xpoint: 100, ypoint: 115},
      {xpoint: 125, ypoint: 55},
      {xpoint: 150, ypoint: null},
      {xpoint: 175, ypoint: 25},
      {xpoint: 200, ypoint: 155},
      {xpoint: 225, ypoint: 15},
      {xpoint: 250, ypoint: 135},
    ];
  
var Gen = d3.line()
  .x((p) => p.xpoint)
  .y((p) => p.ypoint)
  .defined(function (d) { return d.ypoint !== null; });
  
d3.select("#gfg")
  .append("path")
  .attr("d", Gen(points))
  .attr("fill", "none")
  .attr("stroke", "green");
  
</script>
</body>
</html>

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Output:

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