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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Aug 24, 2006
I have the following HTML code which is doing a GET to a page, say
MyUrl.aspx :
<body>
<form name="form1" method="get" action="MyUrl.aspx" id="form1">
<input type="hidden" name="ClickedElement" id="Messenger" />
</form>
</body>
where the the Submit() is done within a javascript function invoked at
onclick on some element.
My question is: How can I prevent form submission when MyUrl.aspx is
not available? The javascript function is:
function Clicked(MyControl)
{
var _CellContent = document.getElementById("Messenger");
_CellContent.value = MyControl.id;
document.form1.submit();
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Sep 25, 2006
Is there any possibility to check the existence of XML?
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Sep 22, 2011
I need to check the whether an external url like http://www.somesite.com exists or not using javascript.
I have a ajax method for it,
function checkUrl(url) {
var xmlhttp=false;
if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
[Code]...
But is not successful for finding existence of external urls.
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Mar 26, 2006
I am using Javascript to add rows to tables, etc. in a function I am
calling. I pass the function the ID of the div, and what I want in the
rows, and it will add rows to a table in the div.
The problem is I need to test for the existence of the table - and if
the variable or object doesn't exist already my code errors -
PLEASE REMEMBER - I don't know the name of the variable or object I am
testing the existance for - it is created dynamically based on the
divID. So when I test for this object or variable the test has to be
for a dynamically created object - Code:
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Aug 28, 2010
i am trying to pass text from one select box to another select box. The logic is if 10 are added, no more passing must happen. Also if an item is already added, it mustn't be added again.I am using the for loop to check the existence of an item but it is not working: what am i doing wrong?
Code:
function PassSelectValues(){
//pass values from select boxes to select boxes
var counter;[code]....
why isn't counter incrementing at all? The alert message box does appear saying item exists but the item gets added anyway.
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Jul 20, 2005
I know absolutely nothing about JavaScript but I am told that JavaScrip
is needed to solve my Form problem. I’m trying to figure out how t
take 2 List fields that would have text names but would represen
numeric values and calculate them.. Code:
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Feb 20, 2006
I've got an asp page that creates fields on the page based on database information, so I don't know which fields will be there, but I do know the formula for devising the field names. I'd like to validate them using a javascript function, but I'm not sure how to access their data. So, for
example, I would like to set a variable to: "form.myfield.value", and then access the contents of that field using javascript. Can this be done, and if so, how?
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May 26, 2005
I am looking for a way to troubleshoot css rendering problems. Is there a way to find the calculated styles for any object? I would love to be able to mouse over an element and see all the styles that are causing the element to be where it is, and look the way it does. The elements must "know" this information. Cross browser would be great, but we mainly deal with intranet apps based on IE. Code:
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Oct 25, 2011
1- Need to display three values on the screen as the user fills a form: total, required deposit and final balance. I managed to display the total but I can�t make the form to show automatically the two other values (deposit, final balance) unless I ask the user to click on buttons, which is not desirable since $ does not change automatically for deposit and final payment if user clicks on another radio button before sending the form.
2- Need to send to an e-mail the values of total, deposit and final balance, along with the choices the user made (ex: "Quad" and "Med"). I only managed to send the choices, not the totalled values.Here is the code I wrote (for demo purpose, I only put 2 choices vis-a-vis radio buttons):
[CODE]
<html><head><meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Registration</title>
[code]....
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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?
[Code]....
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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;
n++;
}
...but just got an error message that myArray was undefined. What's the "right" way to do this?
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Apr 24, 2011
Here is a small snip-it that I'm using to colour lines of a table as a user rolls over them.
function colour(){
var rows = document.getElementsByTagName("tr");
for(i=0;i<rows.length;i++){
[code]....
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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
//php which sets users array to the results of the sql
$selectquery = "SELECT Username FROM User";
[code].....
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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 true.it still displays false.
how do i check whether result is empty or not.
function checkSession()
{
var result = <%=session.getAttribute("INTPERCENT")%>
alert(result);
if(result=="")
{
alert('false');
return false;
}
else
{
alert('true');
return true;
}
}
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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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Oct 28, 2011
I've written a program which will prompt for a number of cities, Prompt for the name of the city, then prompt for the number of snowfall readings of that city, and then prompt for each of these individual snowfall readings of that city. From this, it adds up each of the individual snowfall readings of that city, and will calculate an average by dividing this figure [the total snowfall] by the total number of readings for that city. This average is used to then classify the city as "not snowy", "mild", or "blizzard". I'm happy to PM my code to anyone willing to help out, as I realise this is a complex structure to visualise perhaps, but I can't post it publicly.
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Jan 15, 2011
var check = "<img src='image.jpg' alt="check"/>"; i want to alert alt value
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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 "www.somesite.com?groupid=" with no value for groupid, I do not want to show the hidden div.
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Aug 23, 2001
How do I check if a certain word exists in a text box? For example, if I set the word to be found to "word1", if the text box is "This is word1", and alert would come up saying that "word1" was found.
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Apr 13, 2011
I am creating this Javascript/XML HTA that is basically a project tracker. I recently added some new fields in the form that are written to the XML file for the project being tracked. This makes the files neither backwards compatible if I use it in a previous version nor forward compatible for future versions. This means if a user is using version 1, I create version 2, he wants to import his old tasks to Version 2, it throws an error. For example if I have a <status> element written in the newest version, but no <status> in the previous, I can no longer use that projects XML file in a previous version.
I tried to use the following code to validate existence of the tag and assign whatever outcome as the variable to write, but it's not working. Theres a few different ways I tried.
1st Way:
Code:
2nd Way:
Code:
3rd Way:
Code:
Here's the XML file for reference.
Code:
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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)...
Code:
<?php
if(!isset($_SESSION))
{
session_start();
}
// 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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Jul 20, 2005
Suppose I have global variables: x1, x2, x3
and I have a function that needs to assign a value to a new global variable
x4
something like
function foo ()
{
count = 0;
do {
count ++
varname = 'x'+ count
} while (globalExists (varname)
eval ( varname + ' = "I am new in the x-series" ' )
}
how would the function globalExists () be implemented ?
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Jul 20, 2005
Is it possible to check for the existence of an element? I have a dynamic
page which may or may not have a <div> holding a bunch of thumbnails, and I
want a function to check for the existence of the <div>. Doing:
blah = getElementById("thumbnails");
Generates an error.... I was hoping it would just return false or
something... Is there a way of doing this?
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Feb 19, 2009
I'd like to be able to toggle the existence of a DIV using the onclick attribute.
HTML Code:
<input type="radio" value="1" checked="checked"
onclick="document.getElementById('div').style.visibility='hidden';"> 1
[code]....
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Apr 13, 2010
I have the following code:
Code:
<script language="javascript">
<!--
// Max number of items to show/hide
[Code].....
Which is designed to hide all but one of a group of DIVs with consecutive IDs in the form "listings_stations_<number>". The problem is, I won't know how many of these DIVS there will be. I know a maximum possible number though.
The script as-is works, but obviously throws up errors trying to get handles to non-existent elements/objects. How can I check an element exists before getting and setting style properties for it? I'd like a solution that works for all three browser-types the script currently works with.
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