javascript function input validation

Question

I am trying to write a javascript function which is called input() (performing input validation) and it will contain 3 arguments - the arguments are message, min and max.

I am having trouble bringing/writing the the function as a whole, have managed to work out bits of the function though - any help appreciated!

Code so far:

    // declare variables

var min = 5
var max = 20
var message = 'input must be between 5 and 20';

// get user input
input = parseInt(prompt(message));

// check range
while(isNaN(input) || input<min || input>max) {
    alert('input was invalid');
    input = parseInt(prompt(message));
}

// output validation
alert('input was accepted');

(from http://jsfiddle.net/AnJym/2/)

@sushilbharwani jsfiddle.net/AnJym/2

geef
– geef

2011-10-04 06:13:11 +00:00
Commented Oct 4, 2011 at 6:13 — geef
– geef, Commented Oct 4, 2011 at 6:13

Otto Allmendinger · Accepted Answer · 2011-10-04 06:20:02Z

2

looks pretty good - the last thing to do is to declare a function and put your code in the "function body"

var input = function(min, max, message) {
    // your code
    return input;
}

you could also write function input(min, max, message) { ... }, but it's a matter of taste.

Now you can do var i = input(5, 25, "input must been 5 and 25") and i will contain the validated variable.

answered Oct 4, 2011 at 6:20

Otto Allmendinger

28.5k7 gold badges71 silver badges79 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Neelam · Accepted Answer · 2011-10-04 06:17:49Z

0

Write above three lines in a funnction

function inputvalidation(){
var min = 5;
var max = 20;
var textvalue = document.getElementById('txtinput').value;
if(textvalue < 5 || textvalue > 20) {
  var message = 'input must be between 5 and 20';    
  }
}

call the function on click of a button.

answered Oct 4, 2011 at 6:17

Neelam

1,07812 silver badges26 bronze badges

3 Comments

Otto Allmendinger Over a year ago

The goal is to write a function that take three arguments

tereško Over a year ago

@OttoAllmendinger , Uncle Bob would tell you that it is a pretty bad way to do it: vimeo.com/13439458 =P

Neelam Over a year ago

hmm...my bad...upvote to ur ans since the author of question got the ans from ur post.

Fahad Hussain · Accepted Answer · 2011-10-04 06:20:25Z

-1

function input(min, max, message){
   var val = document.getElementById('InputControlToBeValidated').value;
   if(val>=min && val<=max){
      return true;
   }
   else{
      alert('input must be between '+ min +' and '+ max);
      return false;
   }
}

I hope this will help you

answered Oct 4, 2011 at 6:20

Fahad Hussain

1,1851 gold badge11 silver badges17 bronze badges

Collectives™ on Stack Overflow

javascript function input validation

3 Answers 3

Comments

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related