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D3.js queue.defer() Function

  • Last Updated : 04 Aug, 2020
Geek Week

The queue.defer() function in d3.js is used to add the asynchronous task callback to the queue. Where the task is a function to be executed. The callback must be executed when the task got finished.

Syntax:

queue.defer(task[, arguments…]);

Parameters: This function accepts a single parameter as mentioned above and described below:

  • task: It is a function that is to be executed to perform a particular task.

Return Value: This function returns the object.

Below given are a few examples of the above function.



Example 1: When the size of the queue is equal to the number of queue.defer() calls.

HTML




<!DOCTYPE html> 
<html lang="en"
<head
    <meta charset="UTF-8"
    <meta name="viewport"
            path1tent="width=device-width, 
                       initial-scale=1.0"> 
    <title>Document</title
</head
<style>
</style
<body
  <script src
  </script
  <script>
    function a(){
      console.log("from a")
    }
    function b(){
      console.log("from b")
    }
    function c(){
      console.log("from c")
    }
    let q=d3.queue(3)
    // Calling defer three times
    q.defer(b)
    q.defer(a)
    q.defer(c)
    console.log(q)
    console.log("Size of q is: ",q._size)
  </script
</body
</html>

Output:

Example 2: When the size of the queue is less than the queue.defer() calls.

HTML




<!DOCTYPE html> 
<html lang="en"
<head
    <meta charset="UTF-8"
    <meta name="viewport"
            path1tent="width=device-width, 
                       initial-scale=1.0"> 
    <title>Document</title
</head
<style
</style
<body
  <script src
  </script
  <script>
    function a(){
      console.log("from a")
    }
    function b(){
      console.log("from b")
    }
    function c(){
      console.log("from c")
    }
    let q=d3.queue(1)
    // Calling defer three times but it will add only function
    // call b because the size of the queue is one.
    q.defer(b)
    q.defer(a)
    q.defer(c)
    console.log(q)
    console.log("Size of q is: ",q._size)
  </script
</body
</html>

Output:

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