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: