NaN Returned When Field Is Blank?
Feb 19, 2009
The following code is my form, if one of the fields is left blank (and there will usually be one left blank) the calculation returns NaN and will not perform the task needed. I initially had the form set to calculate in metric kilometers and liters, when I converted the math portion to miles and gallons it started doing this.This is the line giving me the problems:
var cars_emissions=(((mileage1/efficiency1)*0.3732417216/1000)+((mileage2/efficiency2)*0.3732417216/1000)+((mileage3/efficiency3)*0.3732417216/1000));
The original was:
[code]....
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Mar 11, 2011
I have a three field contact form on an HTML5 page. Using CSS3/HTML5 techniques, the fields change state as the info is entered properly (green OK symbol if good, red "!" if not, etc). That all works as expected in all browsers.
My final hurdle is preventing the form being submitted with nothing entered in the fields. I have done hours of research and have tried several ways of writing the checkFeedbackForm function. My problem is that none of the solutions I've found are recognized by FireFox (mac and pc) and IE. They just ignore the javascript and allow the empty form to be emailed.
[Code]..
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Jul 14, 2011
My Javascript doesn't display an error when the "bid" field is blank but I want it to.Everything else works okay but I'm not a Javascript programmer so I don't know where to begin.
function checkBid(fieldName,minValue,maxValue){
var numberfield = fieldName;
if (chkNumeric(fieldName,minValue,maxValue) == false){
[code]....
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Oct 14, 2011
When a user has entered text into form fields and hits the Save button, the text is saved into local storage. When they hit the Load button at a later date, the text fields are populated.If the user does NOT enter text and hits the Load button, the default empty text fields are populated with the word "undefined." How do I keep the field blank? Because if they do this accidentally, they'll be hitting the back button repeatedly to delete the word in every field (this is on an iPhone).Here is the Load code:
Code:
/*
* Insert data into form fields from local storage.
[code].....
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Apr 23, 2011
I want to carry out form validation for drop down lists. My website has 10 drop down lists. I want an alert message to be displayed whenever the user selects a blank field from a drop down list. One of the sample drop down list runs as follows:
[Code]...
How can I include a function that displays an alert message whenever a user selects a blank option from the drop down list?
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Mar 20, 2011
what's wrong with this code to check if a text field is blank and either display/hide the <div> accordingly.
Code:
<SCRIPT language=javascript type=text/javascript>
function validateForm(order)
{
{
[Code]....
The <div> (id='name') is displayed if nothing is entered and the user clicks submit, however if the user then enters a value into the text field, and re-submits, the <div> still appears.
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Oct 26, 2010
I'm trying to set up a form that has a text field that is required to be blank - I'm dealing with form spam, and the bots are stuffing every text field with random crap. So, I have a text box that is required to be blank. But I can't get jquery.validate to understand both required and blank.the text input is has a name and id of live_check.I have added this method:
$.validator.addMethod("equalToParam", function(value, element, param) {return value == param;});
and then my rules look like this:
rules: {
first_name: "required",
last_name: "required",[code]...
But validate flags the empty text box as invalid (because it's required?)
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Feb 28, 2011
I have a scenario where I have the following jquery
Code:
$("#frompdc<?php echo $JavaCnt;?>").change(function(){
var id = $('#id<?php echo $JavaCnt;?>').attr('value');
var frompdc = $('#frompdc<?php echo $JavaCnt;?>').attr('value');
var topdc = $('#topdc<?php echo $JavaCnt;?>').attr('value');
$.ajax({
type: "POST",
url: "AJ_Update.php",
data: "firm=y&id="+ id + "&frompdc=" + frompdc&topdc=" + topdc
});
And some php to insert this data
Code:
mysql_query("UPDATE TBLTRANSFERS SET FROMPDC = ".$_POST['frompdc'].", MOD_TS = '". $timenow ."' WHERE ID = ".$_POST['id']);
I'm trying to throw some validation in here which I can do in php (a language that I'm much more proficient in) but can't figure out how to get the two together. I want to be able to do a select against another table I have for both the frompdc and the topdc.
Code:
$tofpdcresult = mysql_query("SELECT * FROM tbltransferspdcexclusions where FROMPDC = '".$frompdc."' AND TOPDC = '".$topdc."'");
$tofpdcnum_rows = mysql_num_rows($tofpdcresult);
And if it exists I want to give a popup message to the user as well as blank out the field.
I'm struggling with two things:
How do I get ajax to run two queries and return the results to a popup window?
How do I blank out the field in the form?
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Dec 31, 2004
There will be a pop up menu upon detection of a blank field and I need to stop further execution of the script. How do I achieve that?
<?php if ($email_to == ' ' )?>
<script language="JavaScript" type="text/javascript">
window.alert("Please enter your the to field. Thank you.");
</script>
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Jul 13, 2011
I am trying to validate a web form. Someone else wrote the Html code and implemented it with an iframe using asp and php. I didn't want to mess too much with the code so I decided to use javascript to make the form validate, before it was sending email alerts with every field blank. For the most part the validation works but it skips the email field for some reasons and is really bugging me to death. this is the code:
<head>
<link type="text/css" rel="stylesheet" href="CSS/style.css"/>
<title>Bid Form</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script src="gen_validatorv4.js" type="text/javascript"></script>
<script type="text/javascript">
[Code]...
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Oct 10, 2007
I am trying to create a javascript form validation that will make a text field be required only if a previous text field is populated. If the first text field is blank, then the second field can be blank as well.
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Oct 8, 2010
I want to do a form validation and it should return a message like "should not be empty" when the user leaves the field blank..
I have html code like this
Now I want to know how can i display alert message to the user saying that the particular label name should not be empty..
For eg.. here I want to display alert as "Did you find this article useful? field should not be empty".... (Assuming this is mandatory)
I have so many fields like this in my form(checkbox, radio buttons, etc...) and i want to display alert with label name...
How can I do this using javascript.. (I know how to do validation in javascript popping up the alert(without label name), But I am not sure how to display alert with label name))))
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Jul 25, 2011
I am doing a few tests with javascript and oop. but one failed so i falled back to the way i usually do this but it still isnt working properly. i am using $.post() but instead of returning whatever is echoed in the php file like it does with all my other scripts it returns the content of the file:
Isnt returned in var data but the whole file is returned as a string.
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Jul 25, 2004
I have a frame_structure.html divided into column-frames(frame_menu.html and frame_content.html). When user click on menu links, I want the statusbar not to display the link.
I know how to do inline onMouseOver (... true;"...); with each href in frame_menu.html. But I want to write just one time using <script>. I've tried in frame_menu.html
<header><title></title>
<script language="JavaScript">
window.statusbar.visible = "false";
</script>
</header>
<body>
<a href="1.html" target="content">1.html</a>
</body></html>
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Apr 5, 2002
There must be an apostrophe or some other little javascript nuisance that I'm still including in this script, but whenever I try it out, nothing shows..it is supposed to randomly display some text and a link Code:
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May 11, 2010
I know I can use the functions like parseFromString() to access and modify an existing XML documents, but is it possible to use JavaScript to create a blank xml document?
I want to take data entered into the client, package it up as XML and use ajax to transmit it to the server. So far I've written my own class to create a simple xml document, but I'd like to do it properly with the inbuilt functions.
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Jun 16, 2011
I'm building my portfolio website. I'm an illustrator and graphic designer (for printing). My website uses html and css. I introduce a jquery plugin to create a slide show with my work. Until then, everything was working well. The problem appears when I introduce php to my code in order not to repeat the navigation bar all the time. With php and the jquery together I get a blank page in my browser.
This link shows the blank page I'm getting using php and jquery together. [URL]
This is an example of the site without the jquery. [URL]
Could someone please help me with this thanks.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
[Code].....
Those <li> tags Im using is to numbered the images. It might not be a good practice but it works.
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Apr 1, 2003
I'm using an swf on a page that contains javascript function calls that relate to an external js file linked to the swf's parent html document.
Still with me?
Ok.
The idea is that when javascript is enabled all the extras work, and when it is not enabled, they don't (though the page still displays the initial content).
This behaves as intended in Camino with javascript both on and off.
This also works fine in IE5Mac when javascript is on.
Problem is, when javascript is off in IE5Mac, the first instance of javascript in the swf causes the entire browser window to go blank (no html content, no back button, no reload. Nada).
I've tried conditionalising the function ( if (document.geElementById) ) both in the function declaration itself and the function calls within the swf, but the problem still occurs.
Fwiw, the function calls within the swf relate to a function that alters html text using the innerHTML branch of the DOM.
Is this a documented bug with IE5 (Mac?) or is there some way round this that simply gets IE5Mac to ignore the function calls coming from the swf when javascript is disabled?
Alternatively, is there some way of getting the swf itself to ignore any javascripts contained insied if the browser is not javascript-enabled?
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Jul 25, 2007
I would like to have a blank space to separate the options in the "Select Color/Size drop down box" I would also like to have an alert('Please select a size'); show up if someone chooses the blank space. I have tried to do this but my attempts have been fruitless so far. Code:
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Mar 9, 2011
I have this code and was trying to modify and not sure what i got wrong..
Getting error object expected ")"????
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Page title</title>
[Code]....
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Feb 15, 2009
I have the following piece of code in use on a vBulletin forum:
function sel(postid,username)
{
if (document.getSelection) {
var str = document.getSelection();
[Code].....
What this does is if the user highlights some text in a post and presses a button, it inserts the highlighted text into QUOTE tags within the Quick prely box.
This works fine...however, it doesn't check if the user has actually selected some text. Many users simply press the button thinking it will quote the entire post, when in fact it will simply insert some "blank" quote tags.
What would I need to add into this to check that some text has been selected, and return an alert if not?
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Oct 24, 2011
First time back here in a while, but I'm trying to get proficient in JS. I want to make my input element reset its value attribute to blank, which is originally set to "your e-mail". You know the effect you see on forms that have text in them, then with the onclick attribute, you can clear the text in the box.
So, after looking around trying to find out what to do, here's what I've attempted.
[Code]...
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Jul 23, 2005
I am new to javascript and currently coding a site with scripts that
are beyond my level of understanding. The problematic page has
thumbnail images that can be clicked on to zoom in. When clicked, the
preloaded larger image displays in a div layer that gets turned on. The
problem is that ie sometimes does not display the image - the
placeholder just stays blank. The script works fine in firefox and
netscape (haven't tried safari yet). Since I am new to this and this
only happens sporadically, I'm having a lot of trouble identifying the
error or a fix. Also, the src for the images is dynamically created
from the text name that displays below the bags. This is for content
management purposes. Code:
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May 4, 2006
can anyone tell me why an additional blankspace appears for a dropdown
menu when using netscape6.1? this works fine for IE.
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Aug 20, 2010
[code]...
The alert is blank. test.php definitely returns something.
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Mar 15, 2009
I have
function dototal(){
tamount=parseInt(document.myform.amount1.value)+parseInt(document.myform.amount2.value)+parseInt(doc ument.myform.amount3.value);
document.getElementById('total').innerHTML=tamount;
}
The problem is if amount is blank it can't add it -- how can I change it that if it is blank it should treat it as 0?
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