SetTimeout function allows you to set timeout in JavaScript, that is, execute a function or piece of JS code after a given time interval. Generally, we just call a function within SetTimeout(). Sometimes you may need to pass parameter to SetTimeout callback section. In this article, we will learn how to do this.
How to Pass Parameter to SetTimeout Callback
Here is the syntax of SetTimeout function.
setTimeout(function,milliseconds);
Sometimes you may want to pass parameter to callback function of setTimeout. Let us say you have the following function.
function hello(day){ alert('today is '+day); }
Let us say you want to pass the day input argument of above hello() function from within setTimeout().
Here is how you can do it. You need to create an anonymous function as the callback and pass the parameter. Here is an example for it.
function hi(day) { if (day=='Sunday') { setTimeout(function(){hello(day)},4000); } } function hello(day) { alert('today is '+day); }
Please note the following line in above code. We accept the input parameter day from function, and then pass it to hello() function, called within an anonymous function defined as callback for SetTimeout().
setTimeout(function(){hello(day)},4000);
Alternatively, you can also call it as. In this case we use bind() function as our callback function call.
setTimeout(hello.bind(null, day), 4000);
Please note, the following syntax WILL NOT WORK although it seems to be intuitive.
setTimeout("hello(day)",4000);
In this article, we will learn how to pass parameter to setTimeout.
Also read:
How to Generate Random String from JavaScript
How to Fix PostgreSQL Error: Fatal Role Does Not Exist
How to Install Python Package Using Script
How to Iterate Over Python List in Chunks
How to Create Python Dictionary from String
Related posts:
How to Count Substring Occurrence in String in JS
How to Detect Invalid Date in JavaScript
How to Test for Empty JavaScript Object
How to Get Property Values of JS Objects
How to Add 30 Minutes to JS Date Object
How to Bind Event to Dynamic Element in jQuery
How to Add 1 Day to Current Date
How to Convert Array to Object in JavaScript

Sreeram has more than 10 years of experience in web development, Python, Linux, SQL and database programming.