Check If Field IsNaN
Apr 3, 2006
<html>
<head>
<script type="text/javascript">
function convertHaH()
{
var mylist=Number(document.getElementById("percent"))
document.getElementById("remainder").value=100-mylist.value;
}
</script>
</head>
<body>
<form>
First percentage:
<input type="text" id="percent" onchange="convertHaH()">
<p>Remaining percent: <input type="text" id="remainder" size="20"></p>
</form>
</body>
This code works great, it will populate the second box. But I would like it to check if what was entered is a number if it isn't then an alert box shows stating they need to enter a number between 1 - 100, else it populates the second box.
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Nov 12, 2009
I am actually learning Javascript atm as part of a course I am studying. I am wanting to do some validation for a form I have created. It doesn't validate for non-numeric characters like I want to do and it does not display the end result either.
[Code]...
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Jul 27, 2010
I'm performing some validation functions on a form I've created.For the phone number, I have 3 text boxes lined up next to one another. The first is for the country code, the second is for area code and the third is for the remainder of the phone number.I have used the following in order to detect whether the input value isNaN.
Code:
input = document.getElementById("phone1");
if (isNaN(input.value)) {
errorText += "[code]...
As I have three text boxes for the phone number, can I group them within this one statement? So, ...getElementById("phone1, phone2, phone3"); ?If not, what would you recommend?
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Sep 13, 2009
I am having difficulty with the isNaN built-in function. Here is the code that I have written, with the event handler onchange, the function does not return the desired response.
CODE:
Here is an example of the event handler code...one of three calls to this specific function...
<input type="text" name="zip_billing" size="5" maxlength="5" onchange=" return checkNumber(this.value);" />
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Aug 4, 2006
I'm having some problem with checking with the follwoing code:
if (appForm.q15a[i].checked==true && appForm.q15cert.value==""){
alert ("You must enter value!!!!")
valid = false;
}
What I'm trying to do is have the user enter some data based upon if
the radio button is true and the text field is empty. What could be
wrong with the following code above.
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Sep 21, 2009
I have the following hidden field within a form:<input type="hidden" name="test12" value="test12" />I also have the following function which does something if that field exists:
if(document.formName.test12.value == "thisdata")
{
//do something
[code]....
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Nov 12, 2003
i have an if structure checking to see of the fields have been filled in.
On the text fields though there is no value so how can i check to see if nothing there which would mean aint been filled in.
i tried
if(variable = ""){
bla bla bla ..............
}
doesnt work,
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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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Aug 4, 2007
I have an image validation script that im working on. This is what i have so far...
<script type="text/javascript">
<!--
function validate_form ( )
{
var imgcheck;
valid = true;
if ( document.editavatar.avatar.value == "" )
{
alert ( "Please Enter an Image Url!" );
valid = false;
}
return valid;
}
//-->
</script>
How can i add to that so that it checks if the avatar field has the words png, jpg, gif and bmp, and if it doesnt, valid will be false. So in other words, if it does contain png, jpg etc it will return valid.
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Aug 18, 2010
I have some problems with validating form in javascript.
I have a following HTML code:
What I want in validation is to check all the field in form (check for required fields etc). I want to show user error message in div tag with id='poruka'.
Part of code of function ValidirajFormu:
So, validation works OK, but message is not written in div tag. Only if all fields are correct, form is submited, but there are no error message.
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Oct 12, 2006
I am doing some basic form validation stuff and I have two fields (phone, fax) that I need to check if the characters enterred are numeric, but still allow + and () characters to be enterred. If anything else has been enterred to display an error message.
Can someone point me to a resource ( I searched, but couldn't find an obvious one!) or give me a rundown on some code here to help me out?
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Jun 29, 2010
Is there anyway I can check if the cursor is an input field? I need a function that determines if the cursor is in any input field on the page.
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Mar 2, 2011
I have a form that is basically a table from my database.I have checkboxes on the left and only those checked get updated on submit.I�m trying to make an function that is called with an onChange event that will check the box if any of the fields in that row are altered. The id of the checkbox is checkeds[i] where �i� is the row number.The function is firing, but the box isn�t getting checked.
Code:
function checkBox(row)
{
[code].....
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Apr 13, 2010
Okay, new to this magical thing called Javascript and LOVING it. Don't know how I avoided it all these years. :thumbsup:
Running into a stupid issue and I am sure it is just something I am missing. I have a hidden field in my page with the default value of HELLO. I am trying to make a change based on the default value, but I obviously am doing something wrong because it won't display my hidden field value. [code]...
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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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May 3, 2010
A non leap year can be divided by 100. But a leap year is divisible by both 4 and 400.This seems so simple yet I can't nail it. I'm taking an accelerated Javascript class and I was able to do all the problems up to this one. It's confusing me, or it may be that I've been up since 2 working on homework and getting ready for another test.
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
[code]....
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Jan 26, 2010
How can i check if file form field has file selected or is empty?[code]...
is this ok or is there a better way?
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Dec 23, 2010
I have a shopping cart with a quantity field. I also have an update button that updates the totals. Myquestion is how can I use jQuery to check the quantity field when it loses focus, to check the value against the database and the Instock field. If gt then display a tooltip (or something) and not allow the form to be submitted. The problem is the field is called sel_qty for each product.
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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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Dec 30, 2011
I would like to disable a feature on my site if someone is in a textarea or input text field. Yet I can't seem to figure out how to check for this... Could someone give me an example of how I can determine if a user does not have a text input or textarea selected? Can't seem to get anything I found via google working.
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Jun 14, 2011
I am having trouble with some javascript code that checks the first 2 letters of what the user inputs and whether it equals a certain set of characters. If the user for instance types in 'TT' in an input field, then i want the holding div to disappear, if anything else is typed in then this action wont happen. My code is below:
Code:
<script type="text/javascript">
function checkCode() {
var x=document.forms["myform"]["code"].value.substring(0, 2);
if (x == 'TT')
[Code]...
I believe the problem lies in the javascript line: "if (x == 'TT')", as the rest of the script responds but it just doesnt recognise whether 'x' starts with 'TT'
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Aug 6, 2005
i'm fairly new to regular expression and want to know if it's possible to check a text field value. I need to only accept value between 0 and 20. I've got also a problem with the 0 value ... guess the script think it's false :
if(!Number(document.data.f_cat_1.value) || document.data.f_cat_1.value > 20){
alert('Your must enter a numeric value between 0 & 20 pts!');
document.data.f_cat_1.focus();
return false;
}
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Nov 22, 2011
i studied what is RegEx and i wan't to implement it. problem is i don't know how to use it or check it aganist any input text field etc.
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Aug 11, 2011
Is there any way to use jquery.validate to check if any field from the form contain HTML injections?
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Aug 25, 2011
I am using jquery.validate.js for my validation. I need to validate some dynamic input fields. By using class now I am able to validate that. Here my problem is to validate for the file extension.
For static files I use as
file: {
required:true,
accept: "png|jpg",
},
How to write the accept validation for dynamically generated input fields. Below is my input field where the ID and name will change for every input field.
<input type="file" id="tval_1" name="tval_1" class="required accept" />
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Jun 14, 2010
I have already done a number of things with Jörn's validation plugin and I'm excited about its features. But here is my question: how do I validate a field so that it fits the two following conditions: it should be an integer and should not be equal to zero? So, if a user enters "0", it should be error; if he/she enters "12.5", it should be error also; but "-3", "125", "40" are OK.
[Code]...
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