Check If Array Contains Variable?

Dec 15, 2010

I am currently trying to check using javascript whether a php array contains a variable, and if it does then display a message.I have written the following code...

//php which sets users array to the results of the sql
$selectquery = "SELECT Username FROM User";


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Check If Check Box Is Checked On Name Array?

Apr 19, 2010

I'm working a bunch of pre existing code on a CMS. Just after a quick fix. Doing a show/hide thing on a particular div somewhere on the page depending if a checkbox is ticked or not.Currently there is 3 checkboxes that are dynamically added through the CMS. Here's simplified version of the form:

<form id="simplesearch" name="simplesearch">
<input type="checkbox" onclick='showhidefield(this.value)' name="meta_data_array_search_criteria[custom_profile_type][]" value="5" class="input-


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Array - Value Of A Variable To Perform Multiplication Against Array

Mar 20, 2009

I am accepting an array, and a value of a variable to perform multiplication against my array, then write the product back into the array.


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Check Variable Value For Changes

Nov 17, 2009

The code below puts a link in mydiv when the page loads if myvar equals 1. Great till here, but if myvar changes its value and it does not equal 1 any more I have to reload the page in order not to see the link. What do I have to do to avoid that reload? what do I have to do to check myvar's value for changes constantly?


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Check If Variable Is Set

Jul 4, 2003

is there a JavaScript equivalent to the PHP isset() function? Basically, I just need to see if an array has already been created. If not, I'll create it. If so, I'll add to it. I tried something like...

if (!myArray) {
var myArray = new Array();
myArray[0] = someString;
n = 1;
} else {
myArray[n] = someString;
...but just got an error message that myArray was undefined. What's the "right" way to do this?

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Check If None Of Array Matches.......

Nov 26, 2002

It's to allow users to create thier own descriptions, and the input is displayed automatically using innerHTML. This part of the function checks if the HTML tags are allowed through, I've got this far...

allowedHTML=new Array("<br>","<b>","</b>","<i>","</i>")
function formcheck() {
if(HTMLcheck==allowedHTML[k]) return; else alert()}}}}}

I want it to trigger if one of the "allowedHTML" isn't found by the time it's finished going through the array.

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Check Form Value Against Array?

Jul 19, 2010

I need to verify that the email address is not a free account. I will have an array that contains a list of free email providers. ie. gmail yahoo hotmail.I want to compare this list to what the user entered. and if there email address contains one of the values from the array then return false. I am a php dev so excuse the crude code.


var freeEmail=new Array("gmail","yahoo","hotmail");
if (form.email_address.value (contain a value from freeEmail) {
alert( "Please no free email accounts." );


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Check If Variable Is Null

Dec 7, 2005

i have captured the session value and displayed in a variable result.
suppose if i have result =0.then it does not display still displays false.

how do i check whether result is empty or not.

function checkSession()
var result = <%=session.getAttribute("INTPERCENT")%>
return false;
return true;


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Check If A Form Variable Has A Value?

Jun 11, 2011

I need to change the code below so that it will check to see if there is a value for the model variable, its a select dropdown in a form. If there is no value then I don't want the var model to be included in the url part.

I also need to check to see if the var pics is checked (its a checkbox) if its checked then i want to include it, if its not checked then again I need to miss it our from the url part.

Code JavaScript:

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Check If Key Is Defined In Associative Array

Jul 23, 2005

How can I check if a key is defined in an associative array?

var users = new array();
users["joe"] = "Joe Blow";
users["john"] = "John Doe";
users["jane"] = "Jane Doe";

function isUser (userID)
if (?????)
{ alert ("This is a valid ID"); }

But what goes in place of the ????

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Check All Checkbox For Array With Key Assigned

Mar 31, 2009

I am working with a checkbox array where the key is already set. So instead of being able to use name="name[]", I need to use name="name[0]" etc.. I would like a button or a checkbox to select all in the array(name).

The main reason for this is the nature of the checkbox. If a checkbox is not selected then it is completely skipped when looping through the array. To overcome this I added a hidden field of the same name which will assign a value even if the checkbox is not selected. Then the problem of using name[] arises.

The form is populated with hundreds of entries using PHP so I am looking for a way to loop through them all.

Here's a tiny snippet of HTML of how my form is set up.

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Check When Value Is In Array Won't Work Correctly / Fix It?

Apr 27, 2010

I'm looking for some guidance on a part of some coding practice I'm stuck on!

I've created a shopping cart using javascript, the items save to the arrays etc and it all works fine. If the user adds the same product again to the cart the quantity is added onto the previous quantity that is already in the cart.

To check if the item is already in the cart I've ued the below code, but what it does is update the quantity for the first cart, and when it updates the quantity for the second item it updates the quantity but keeps adding the same product to the cart in seperate elements of the array as well (if that makes sense?

here are the two functions used [code]...

It may jsut be a simple mistake I've made but it's been bugging me a lot and I can't seem to fix it.

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To Check Whether All The Values In An Array Are Identical?

Nov 3, 2010

I want to check whether all the values in an array are identical using javascript.Does javascript support this?If so please provide me the js statement.I know it can be done with conditional statements but I want to know the efficient way to implement this.

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Check Array For Existing Element?

Dec 8, 2011

I'm writing a blackjack game for class,it generates two random numbers that select from a switch statement that creates a string file name of a card e.g "AceDiamonds.gif", it then fills an array deck[] with these strings,I want to fill the array with the full deck of 52 cards,and not have any duplicates, how do I check the array for an existing element remove it and replace with another card not in the deck??

var dealer_hand = new Array();


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Check If Item Exists In Array?

Oct 21, 2010

I have declared a javascript array:

var strUsersName = new Array("John","Mac","George");

I want to check, if the particular loggedin user for example Mac is available in the array list declared.How to check in a efficient way, if the particular user loggedin is available within the array declared.I tried this, but I am not sure, if it is correct:

var strUsersName = new Array("John","Mac","George");
var L=strUsersName.length;


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JQuery :: Get Alt Value Of Check Variable Enter?

Jan 15, 2011

var check = "<img src='image.jpg' alt="check"/>"; i want to alert alt value

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Check For The Existence Of A Variable With A Calculated Name?

Jan 29, 2009

I'm processing a form with numbered fields, but I don't know how many fields there are. Might be 1, might be 20. So I'm iterating through 1-20 and trying the following test:

for(i=1; i<=20; i++) {
if(typeof(eval('document.edit_orderitem_form.field_'+i+'.value')) != 'undefined') {
[doing stuff with the form field here]

The script quits on that line with "Undefined value" showing up in Safari's error console. I just can't figure out how to eval() the name of a field when it may or may not exist.

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Check Is Querystring Variable Exists

Oct 12, 2010

I would like to check the querystring to see if a variable exists.If groupid exists in the querystring and has ANY value then show a hidden div (#closedMsg). I do not care what the value of the groupid is I just want to verify that it has a value.If the url looks like this "" with no value for groupid, I do not want to show the hidden div.

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POST Array And Check/Uncheck Checkboxes?

Sep 18, 2009

So that I can pass multiple checkbox values to my PHP processing script as an array I added the square brackets to my form's checkbox input element's name, like this: <input type="checkbox" name="checkGroup[]" value="'.$rowIDs.'" /> Because it has to match, I updated the input element I use to check/uncheck all the checkboxes so that it now looks like this: <input type="checkbox" name="all" onClick="checkAll(document.ResIDsDates.checkGroup[],this)" />

When I manually select multiple checkboxes I can successfully pass any number of checkbox values through
the POST array to my process script...but my Check/Uncheck All box has ceased working -- adding the
square brackets to the checkbox input's name disabled it.

I tried playing with the ASCII equivalents to the brackets, but no go. Is there a way to retain the array
functionality and pass multiple checkbox values to the script AND enable the Check/Uncheck All box?

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Check Whether A Specific UserID Exists In The Array?

Mar 15, 2011

have an array of objects which is gAllMedicalFilesClaimantsArray which has 2 properties (UserID & UserInfo).

For example:
gAllMedicalFilesClaimantsArray[0].UserID = 111;
gAllMedicalFilesClaimantsArray[0].UserInfo = "AAA-123";
gAllMedicalFilesClaimantsArray[1].UserID = 222;
gAllMedicalFilesClaimantsArray[1].UserInfo = "BBB-333";

What is the fastest way to check whether a specific UserID exists in the array using Jquery or Javascript because gAllMedicalFilesClaimantsArray has got 8000 records?

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Check If Form Field Exists And If It's An Array

Sep 5, 2007

I want to validate a form. In the form is a text field named 'extra[]' where the user inputs a number. The number is what I want to validate.

However, the 'extra[]' field is dynamic and does not always appear in the form.

If it appears, there may be only 1 occurrence of it which means it's then not an array but there may also be multiple occurrences of it.

I have a script that validates (and work as it should) if the 'extra[]' field occurs multiple times and is thereby an array, but I can't figure out how to validate the 'extra[]' if there is only 1 and to not throw an error if it's not there at all. Code:

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Check Text In A Textbox Against Script Array?

Nov 9, 2010

I have a text box and would like to see if the value of the input matches the values defined in a JavaScript array.[code]...

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Ajax :: Redirect / Refresh And Variable Set / Check

Sep 5, 2010

This is my first adventure into PHP/Ajax/MySql/Javascript and is pretty much my first web project. I've been trying to tackle this problem for a little over a week now. My main objective is that I want to display php content pages inside a div on the index page without refreshing the page (iframe style). I don't want to stop search engines indexing the individual pages so I need a mechanism to redirect to the index page so that the page is displayed properly. I'm not bothered if it takes them to the exact page and I'm redirecting them to the section of the site where they the page is kept.

I also want a mechanism to redirect if a second search engine link is clicked that belongs to the individual page (ie image links that belong to the same page). This is only a problem because the php session has already been opened and a php variable has been set by the first redirect. All the redirections are taken care of by PHP and I got the redirection of multiple instances working ok by setting and unsetting session variables. This PHP code is included on every content page.

But, when I added links to the index page and try to navigate between pages, it all goes pear-shaped.When the links are clicked it calls up the Javascript code, inside which a PHP variable is set (I dunno if this is the "done" thing, but I came across the solution somewhere on the Interweb). This is the first thing checked when the content pages are called up. If the variable isn't set, then it runs through the redirect options.

The problem is that after clicking the link when the page displays it always refreshes the index page which I don't want it to do and which is why I'm thinking it's the setting of the PHP variable inside the Javascript that's going wrong. (Also why this question ended up in this section). Is there any way of getting this going without passing the variable into the url (not that I'm against this option)? Index page code, PHP Code (before HTML)...

// set the session var to the index page url which I think remains until browser close
$_SESSION['pagecheck'] = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
// set the section var if it hasn't already been set by one of the content pages
if(isset($_SESSION['sectNum'])!= "undefined")
$_SESSION['sectNum'] = "0";
function getSection() .....

Additionally, are there any potential security threats that should be tackled (bearing in mind that I don't want to use cookies, I'm not against this either but decided if they are switched of it may become an issue, and I'm not going to be handling any sensitive information). I really don't want to use Iframes due to any javascript switching off related problems (yes there is a javascript testing function included in my full code!).

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JQuery :: Check Values Of HTML Array Before Submit

Nov 23, 2010

I have a form where I click a button and it duplicates the inputs thus now having X of the same inputs. The input name looks like so:
<select id="select" name="cs_quantity[]">
Is there a way I can check the all values of the quantity before submitting the form? I want to make sure they've chosen a quantity other than 0.

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Array - Pass Fields To A Function That Will Check The Value Of Each Field

Sep 23, 2011

Im trying to pass fields to a javascript function that will check the value of each field and it its empty then it will turn the field color red which is what its doing at the moment, but i want to be able to use this function globaly through out my project, so is there a way of not saying how many fields go in to that array, it will just deal with the amount of fields it gets passed?

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Store Multiple Text Values Into An Array When A Check Box Is Checked?

Oct 18, 2010

I am trying to store multiple text values into an array when a check box is checked. for example when row1 checkbox is checked the values row1col1 and row1col2 are stored in an array. note however row1col1 and row1col2 are editable and not readonly. for example:

<table border="1"> <form id="form1" name="form1" method="post" action="">
<td>row1 <input type="checkbox" name="row1" id="row1" /> (when checked the text fields are editable) </td>


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