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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