CODEWITHSUNDEEP
javascriptvalidationformsreturn-value
tarnfeld
tarnfeld

Reputation: 26556

Javascript return false - from function

Is there any way to do the following:

validateLogin();
return false;

But actually like this..

validateLogin();

And here is the function:

function validateLogin(){
if(hi=true){
return true;
}
else{
return false
}

I want to attach this function for the event of a form being submitted, so if HI is false - i want to return false; meaning it will stop for form from submitting.. i know return false; will do so i just need to know how i can get this return back to the parent function?

Thanks in advance!

Upvotes: 2

Views: 21788

Answers (7)

Mayo
Mayo

Reputation: 10802

I use the following to stop events... 

event.returnValue = false;

cresentfresh inspired me to do some research... here is an article with a compatibility matrix.

There are also related threads on SO.

Upvotes: 3

bucabay
bucabay

Reputation: 5295

The standard way of stoping the default action of an event is: 

event. preventDefault();

You may also want to prevent event propagation with event.stopPropgation(); to stop further event listeners from executing.

http://www.w3.org/TR/2001/WD-DOM-Level-3-Events-20010823/events.html#Events-Event

However, IE will not recognize this which is why you can set event.returnValue to false for IE.

eg:

if (event && event.preventDefault) event.preventDefault();
event.returnValue = false;

You can also return false from the event handler for events inlined in HTML. 

<form onsubmit="return validateLogin()">

This is not considered best practice however.

Note: the event object is passed in as the first argument in your event listener.

eg:

function validateLogin(e) { 
   e; // is the event object
}

For IE you may need window.event. 

function validateLogin(e) { 
   e = e || window.event; // is the event object
}

Upvotes: 2

Eli Grey
Eli Grey

Reputation: 35895

validateLogin() Function

function validateLogin() {
    return hi;
}

HTML block

<form onsubmit="return validateLogin()">
  ...
</form>

Upvotes: 0

Rajasekar
Rajasekar

Reputation: 18948

Try double == (IF I==5)

Upvotes: 0

Romain Linsolas
Romain Linsolas

Reputation: 81627

You can eventually do that:

return validateLogin();

Note that your function code has some errors (maybe due to the simplification of the code you made to post this question?). You'd better write this method like that:

function validateLogin(){
  ...
  return hi;
}

Note also that insted of having if (hi=true) {, you must write if (hi == true) {, or better if (hi) {...

Upvotes: 3

mbillard
mbillard

Reputation: 38852

You can use it as follow:

return validateLogin();

however, as mmayo pointed out, don't forget about the return value:

event.returnValue = false;

Upvotes: 6

markh
markh

Reputation: 793

return validateLogin();

This should do what you want.

Upvotes: 2

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