Var Statement In Doug Crockford's Scheme Functions Translations

Mar 2, 2011

I'm looking at Doug Crockford's Javascript translations of Scheme functions at:[url]

I'm really confused by the variable declaration:

There's no quotes around the value, so what is it?

I played around with it in the console of my Chrome developer tools

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Help With 'return' Statement In Functions

Feb 4, 2006

I have the following script:

function myFunc() {
// some code to do with AJAX
http_request.onreadystatechange = function() {
// do some things
return "a string";



However, when I return "a string"; I want that string to be returned by myFunc() (and therefore alert'ed). What seems to be happening is that the string is being returned by the http_request.onreadystatechange = function() { } function, and myFunc() just returns false. How can I make the string be returned by myFunc()?

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If Statement With Forms And Functions?

Sep 11, 2010

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">


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JQuery :: Changing Colour Scheme?

Jan 10, 2011

I'm looking to give viewers options for changing the colour scheme of a site. I've had a trawl through through the basic jQuery and UI capabilities, and it looks like toggleClass is the best option.

Has anyone other suggestions, from the range of other plugins?

The options will likely include changing the body backgound color, and background-image; changing text colour on certain classes; and changing the *content* of a div, which is the background layer for one area of the window.

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Changing Colour Scheme - Loading New Css

Sep 3, 2010

I am building a site and I would like users to have the option of changing the colour scheme of the site. For example, you can have a 'red scheme' or a 'blue scheme' etc etc..

So, how can I produce a link to load new css files, that will return the current page with new css files?

I am using ASP.NET to develop this site, what would be the best to acheive this, Javascript? Code behind?

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CSS And A Conditional Statement - Trigger The Fade-in/fade-out Functions Of The Span Class Is NOT Set To Active?

Jun 20, 2011

I found this script for a navigation fade-in/fade-out and I want to modify it so it'll only trigger the fade-in/fade-out functions of the span class is NOT set to active. Here is the javascript:

$(function() {
$("#nav ul#menu li").css("opacity","1");
$("#nav ul#menu li").hover("opacity","1");[code].....

It's the part of the code beneath the comment CONDITIONALS BELOW that I want to be able to only trigger it if span is not set to class .active.

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If Statement Returning False On A True Statement?

Apr 4, 2011

my webstie allows users to change the color of the background, so to keep the text readable I have it changing as well.the color picker I am using has text boxes with rgb values 0-255 for each.I am trying to get one bit of text to alternate between red and blue with the conditions

if(blue>green && blue>red)


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Getting Nested Functions To Work Within Functions?

Aug 20, 2009

I have written a number of functions designed to return frequency data on 1000 randomly chosen numbers using different math functions for the rounding. I would like to include all of these functions within the wrapper of another function so that only one call is needed to get returns from all of the 'inner' functions. However, while each of the functions works in isolation, the moment I wrap them in another function they stop working. :confused:

The following code is one of the functions 'frequencyWrapperOne' that has been wrapped in the function 'testWrapper'. A call to testWrapper does nothing.

function testWrapper()
function frequencyWrapperOne()


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Adding Functions To Properties Of Functions?

Apr 23, 2011

$(something).split(something),this is a function with a function as a property for that function.

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Call All The Validation Functions From A File Call Functions.js?

Jan 27, 2011

I have several form in my site, that validate on onsubmit.I call all the validation functions from a file call functions.js.Here is a sample of the code that is working:

<form name="contact" action="contact-insert.php method="post" onSubmit="return checkform()">
<label class='SubHeadlbl' for='TextField1'><?php echo IDS_EFORMNAME?><br></label>
<input type='text' name='dfname' class='text_field' id='dfname1' size='70' maxlength='40'/>

all the other forms are not working. all have the same structure:

<form name="frm1000" action="frm1000-insert.php method="post" onSubmit="return checkform1000()">
<label class='SubHeadlbl' for='TextField1'><?php echo IDS_EFORMNAME?><br></label>
<input type='text' name='dfname' class='text_field' id='dfname1000' size='46' maxlength='40'/>

I don't know what is happening only one for work all the others don't.

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New Foo(); As A Statement?

May 12, 2007

I am reading the ECMAScript specs trying to figure out if the next
line is a legal statement or not new Foo();

I think the above code may only be legal as an expression and not as a
stand alone statement. Would this make the above a bug?

Douglas Crockford's JSLint will choke on the above line of code and
stop parsing. All the browsers seem to accept it as ok and work as I
expect: the returned object just doesn't get assigned to anything.

The time I have used a line like the above is when the constructor has
side effects and the "class" keeps track of all its instances.

Any ideas what is right or wrong in this case?

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IF Statement?

Jul 23, 2007

I have several text fields on page that I would like to make calculations based on if there is a number input in one of the fields.
So, if the price field is populated, the sale price field would populate using a function to do the calculation.

Now, how do I write the code for this to occur? I know how to get the function to fire based on clicking a submit button, but not sure how to do it simply based on a number keyed into the one field. Is this possible and if so, how?

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Is This Statement Correct?

Jul 23, 2005

What is the correct construct for accessing "pageYOffset" in another window?

I've tried this, but it doesn't work:

var mainPageYOffset;
mainPageYOffset = parent.main.window.pageYOffset;

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Time In If/then Statement

Aug 3, 2007

It's been a while since I've worked with javascript time comparison,
and I was wondering how I can say "if time < 15:30"?

The semicolon looks out of place to me, and indeed it has caused an

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Using Null In If Statement

Jul 20, 2005

I remember using if statements with null in it. For example, at one
point I used this:

if (value == null) {
value = "something";


However, this script causes an error in any browser. Why can't it
correct the value like it should?

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JQuery :: Use To Indicate The End Of The JS Statement?

Jul 13, 2010

For the following two snippets, they can all pass Firefox.However, I would like to know the rule of thumb when I have to use ; to indicate the end of


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While Statement Not Using My Vars?

Nov 14, 2011

I have a two fold question:1) Why would my while statement not be workingI have cleaned up my code a little (although not perfect) but my while statement is not behaving, it does not output any numbers on a console.debug (using google chrome, or any other browser for that matter) which from my understanding it should?and 2) Slightly out of the remit of this forum I suppose, but this code is quite lengthy and I know there are ways to make this more efficient I just dont know what they are?

function generatePurchaseFields(dom) {
new Ajax.Request('/control/?page=tldmaxyears&domain=' + dom, {
method: 'get',


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Switch Statement

Nov 1, 2005

This is my first time using the switch statement. I would appreciate your suggestion on how to do this properly. I am trying to get customer age which is (age) and compare it with the monthly rate then the text msg will display in the textarea. Also, I am having trouble figuring out how I can defined my monthlyRate in the switch or do I need to this outside of the switch? Code:

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String In An If Statement

Apr 27, 2006

i have the following:


how can i check in an if statement whether contains a numeric only value and if not then alert.

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Purpose Of With Statement In JS?

May 16, 2009

What is the purpose of with statement in JS?

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Using || (or) In An If Statement Correctly

Dec 8, 2011

I am trying to test the id of three input boxes so that I can capitalize the first letter.

The fname and lname work fine but mi does nothing and I get no error is this because of the if statement or the fact that the mi only has one character?

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Using If Else Statement With Confirm Box

Apr 14, 2009

I need to give two separate alerts depending on what the user clicks when they click the "Submit" button. I am using a confirm box. If they click "OK" it thanks them for their order. If they click "Cancel" it should go back to the form. I have written the code that I thought would work but it will not.

function confMsg(){
var s
s = confirm("Click OK to Submit Order. Click Cancel to Cancel")
if (s=="true"){
alert("Thank You for Your Order!")

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Calculator With If/then Statement?

May 26, 2010

I am working on a script that calculates the rental rate for a property. I currently have this code and form, which works as I wish it to.

<script type="text/javascript">
function roundCents(amount) {


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Optimize An IF Statement?

Aug 26, 2010

I would like to make the following statement clearner. I'm thinking something like the SQL "variable IN (value1, value2, value2, etc.)" operator.

Code JavaScript:
if((e.which > 47 && e.which < 58) || (e.which > 95 && e.which < 106) || e.which==8 || e.which == 46 || e.which == 37 || e.which == 39 || e.which == 13) return e.which;

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Get The Result For The Following SQL Statement?

Sep 7, 2010

How can I get the result for the following SQL statement using JavaScript?

SELECT branch, region, referral, COUNT(DISTINCT LPS) FROM table GROUP BY branch, region, referral


BranchClientReferral TypeLPS #
402036402430Psychological File Review30
402036402430Psychological File Review50


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Use The Quotes In This Statement?

Mar 3, 2010

document.write("<img src=' "+r_image[rand_int]+" '>");

could it not be just written like this:

document.write("<img src='r_image[rand_int]' />");

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