Pass a returned value to a function argument in javascript

Question

I need to get a value from an HTML input in a JavaScript function. I can successfully get the value form the HTML pass that value to other function that is available on that JavaScript.

This is my HTML code:

<input value="3232" id="demo">

This is my script with the main function, and I can get the value from the HTML:

var PageKey = function(){
  var val = document.getElementById('demo').value
  return val;
}

This is what I tried. I can just call the PageKey function in fun3 to get the output, but the returned value of PageKey function should input to fun3 argument. Ex: appData argument should be holding the returned value.

var fun3 = function(appData){

}

Values for function arguments are given when calling a function, not when defining a function. — Teemu
– Teemu, Commented Jul 12, 2018 at 16:22
Given the above code, call fun3(PageKey()). Inside fun3, you can now use appData to refer to the returned value. — user5734311
– user5734311, Commented Jul 12, 2018 at 16:22
Please explain what your actual goal is here. What is the code inside fun3 going to look like? What's the point of putting it in a function? Why do you have an appData parameter in the first place if you're never going to use it for anything other than PageKey()? — user5734311
– user5734311, Commented Jul 12, 2018 at 17:14

Osakr · Accepted Answer · 2018-07-12 16:24:59Z

2

function PageKey() {
   return document.getElementById('demo').value
}

var fun3 = function (appData) {
    ....
}

var func = fun3(PageKey());

answered Jul 12, 2018 at 16:24

Osakr

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2 Comments

user9234162 Over a year ago

Is there a way to do call fun3(PageKey()); inside the fun3 itself or can I do it without calling the function.

user5734311 Over a year ago

@Ayb You can do it, but it's kind of pointless. No offense, but I don't think you 100% understand what the point of functions is in the first place. If you just want to run code, there's no point wrapping it in a function. Unless you want to run that code multiple times, or at a specific point later in time.

Parveen Soni · Accepted Answer · 2018-07-12 17:18:11Z

0

Another way of doing it, provided that you are not calling fun3 from elsewhere (similar to Chris answer):

var fun3 = function(){
     var appData= PageKey();
}
//scope should be kept it mind

answered Jul 12, 2018 at 17:18

Parveen Soni

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