Calling Functions With Parenthis Versus Without

Feb 5, 2010

I'm doing some basic Javascript tutorials on the W3 schools site. Here's my example within the TryIt editor on this page: [URL]

Code:

<html>
<head>
<script type="text/javascript">

[code]....

What is returned in the browser is:

Code:

function myFunction() { return "Hello world!"; }

Why is this? And again, what are the rules for this? When can you get away without the parenthesis, and is it appropriate to use? Is there ever a time when you must not include them? When must you use them?

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JQuery :: Calling A Function ... $('submit").click(ClickGeocode) Versus Simply Calling ClickGeocode(credentials)

Jul 17, 2011

I have a form button with id="submit". When pressed, ClickGeocode(credentials) is called. This works fine and dandy with: $('submit").click(ClickGeocode) Despite there being no indication that the function takes an argument 'credentials'. So when I want to call the function at some point in my code, I should be able to do something like ClickGeocode(credentials) ... no? However, my issue is that credentials isn't once defined in my code - it is part of Bing Maps function... like so:

function ClickGeocode(credentials)
{
map.getCredentials(MakeGeocodeRequest);
}

So why does it work using .click(), and how can I call the function without user interaction (simply somewhere in my code) even if 'credentials' is not defined?

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Jan 23, 2006

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Code:

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Jul 20, 2005

I need to know how to call a function in a different document. At the
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code?

My site is divided into two frames, top frame for navigation, bottom frame
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"top" contains 6 images within 6 seperate anchors, that I use as buttons to
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Here is where I get stuck. I want a different image to be displayed as the
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I was hoping to solve this by using "onLoad=" in each of the main pages for
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list of images changing the relevant image depending on the content of
"main".

I can see an inherent problem here, I have to make every page (could be
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Jun 3, 2010

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May 9, 2010

i cant seem to understand why some functions that i create i have to call them with the () and some without
example:

js:
function popup()
{
alert('hello world');
}
html:
<input type='button' value='click me' onclick='popup()' /> the obove code will work.. but some functions when they are being called with the () at the end do not work.

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Feb 25, 2009

I took a quick trip through the FAQ's and Tutorials and a few Searches, but didn't see anything that looked like what I was looking for. First warning - I am completely new to Javascript and have been trying to teach it to myself over just the last week via Internet Examples, reading forums like this one and a book I bought.

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[Code]...

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Nov 26, 2010

I have an embarrassingly similar problem to the last time I was here. I have a google map that generates links and checkboxes from an xml file and puts them in a sidebar. The links open infowindows and the checkboxes show or hide lines on the map.

Which all works ok. But (like last time) I have another function that puts arrowheads along those lines to indicate directionality.

The code which turns the lines off and on looks like this:
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[Code]...

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Mar 25, 2006

I've created a selection box (drop down box) with several options for the user to click. What I want is if the user clicks a certain box, then a specific javascript function will run. BTW, I am using Google Maps API here. Code:

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Mar 2, 2010

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Oct 3, 2010

I have a problem calling Javascript functions that were included through PHP. The site is written in PHP. I

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Jul 23, 2005

We have an applet that has to support the SUN VMs as well as the MS VM.
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This function takes the object and reads the properties and updates a
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All seems simple stuff. The problem is that the MS JVM runs like a rocket,
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I have tried logging from the console using debug level 5, and it shows a
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Seeing that as a possible problem, I now pass a delimited string to the
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Feb 1, 2011

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[code]....

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Mar 9, 2009

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Jul 20, 2005

I am trying to call 2 functions from the 1 onMouseOver event on an
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I have tried a number of variations, like adding "javascript:" in
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Code:
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Code:
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<option value="">---</option>
</select>

[Code]....

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[Code]...

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