I'm trying to understand how JS constructors work. In particular, I'm trying to work out how I can call a parameterised constructor and check that the values of the parameters are valid within an object that has private properties. So for test purposes, I construct a data of birth object like this:
HTML Code:
<pre>
function Dob( day, month, year ) {
[code]....
Sorry this will be an ignorant question I know, but I'm just trying to implement some quick JS in my form to check if the fields were filled in:
function check_form() {
if (survey.form_firstname.value == "") {
firstname_error = "-Please enter your first name
";
}
if (survey.form_lastname.value == "") {
lastname_error = "-Please enter your last name
";
}
if (survey.form_phone.value == "") {
phone_error = "-Please enter your phone number
";
}
if (survey.form_email.value == "") {
email_error = "-Please enter your email
";
}
if (!survey.form_agree.checked) {
agree_error = "-You must be over 18 and provide accurate information
";
}
errors = firstname_error + lastname_error + phone_error + email_error + agree_error;
if(!errors) {
return true;
} else {
alert("There were errors:
" + errors);
delete firstname_error;
delete lastname_error;
delete phone_error;
delete email_error;
delete agree_error;
delete errors;
return false;
}
}
It only seems to work if no values are filled in, if one of the fields is filled in the error checking fails. Again, I'm extremely new to JS, i've only ever copy/pasted and this is the first time i've tried writing a piece.
I have a form that displays various hidden divs if a visitor checks a certain option in my form. For example, if they select Yes in a radio button a few more form fields will appear beneath it. It works fine except when the form is not filled out properly and the form is displayed again (using PHP). When the page reloads it doesn't show the hidden div unless they select No.
how to make it so if they select Yes, it will make the div appear again when the page reloads? Here's the code I'm using: Code:
all object oriented langs give a posibility to implement many construstors
can I have few constructors in js
i.e.:
function X()
{
this.Id = 1;
}
function X(id)
{
this.Id = id;
}
X.prototype.print = function()
{
alert( 'Id: '+this.Id );
}
var x1 = new X();
var x2 = new X(5);
it doesn't work, print return:
for x1: Id: undefined
for x2: Id: 5
my task was to make two constructors for the code that I also posted and they are not working. why they are not working. I posted them right below. here are my constructors for course and Faculty
course.js:
function Course (name, times, instructorName, instructorDept ) {
this.name = name ||"unknown course name";
this.times = times||"unknown time";
this.instructor = new Faculty(instructorName, instructorDept);
[Code]....
I'm currently learning many web programming languages and figured this would be a good way to learn more and do things better. I have been working on a contact form for my website. I had originally did the error checking in PHP, but I would like to change it to JaveScript since this is the preferred way. I have it all semi working,It seems like I have some unnecessary variables and such.. I would like to clean it all up as best as possible.
[Code]...
I made a contact form for my website originally in PHP. I wanted to change it to JavaScript because that is the preferred way. Originally I had the form in my HTML file using a separate PHP file for error checking. For JavaScript do I have to make a separate page and call to it like the last time? I have put it all on my HTML page and where it was calling for the php page, I also put the JavaScript code. When I go to my site, the error checking is not working at all. There must be something wrong, but I haven't been able to point it out and I am very new to JavaScript. Also, when I go to my page and right click for the source code, the JavaScript I have in there does not show up. Below is my HTML code.
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "[URL]">
<html xmlns="[URL]">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>Contact_Form</title>
</head>
<body> .....
IM NEW AT THIS AND I'M WORKING ON MY FIRST WEBSITE. I USED iWED AND I DON'T UNDERSTAND WHY IT WON'T WORK. WHENEVER I TRY TO OPEN IT IT SAYS: Parse error: syntax error, unexpected T_STRING in /home/a2460084/public_html/beto/index.html on line 1
<?xml version="1.0" encoding="UTF-8"?>
<!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" xml:lang="en">[code].....
I'm new to jQuery and the validation plugin, I just wondered if it is possible to get the error messages to be shown in an error summary section instead of inline?
View 1 Replies View RelatedI am developing a web page . For this i am using Javascript embedded in html. In the application ,the user can input data via interfaces in the page which is chosen and read from a master xml file , the chosen data then needs to be stored and saved in a xml file.I have designed the web page in FrontPage.
Now the problem i face is while trying to save the output xml file i get error Permission Denied , error code 0 . This happens when i try to open the page in browser IE 6.0 SP2.I am using DOM parser methods for doing the xml manipulations/savings etc.urprisingly this works in another machine.Also can i use the all of the same javascript code if i want to run it in an IIS. Do i have to do some changes to make it server side javascript code.
Trying to use a small bit of script to slide open and closed a div.
Copied it from another page where I have it working just fine. Coding in coldfusion.
When clicked, nothing happens, and firebug pulls an error of DC_ShowDeptStaff is undefined.
Script is:
Code:
Call is:
Code:
Full code is:
Code:
I am working on a simple javascript craps game program. I need some advice since it won't display who the winner is, keep tally of who wins/loses, and the number of total games played. After using the error console there's an error with document.forms [0].thrower.value not being defined.
<html>
<head>
<title> JavaScript Craps Game</title>[code]....
How can i check parent's URL from a child (popup) window ? and how can i
refresh it if the URL is say http://www.xxx.com/?
I have some javascript that uses setInterval(..) to change the src of
an image every second. Is there any way of programmatically checking to
see whether an image is loaded properly or if a 404 File Not Found
error occurs for it?
Does anyone have any coding rules they follow when doing argument checking?
When arguments fail during check, do you return from the call with an ambiguous return value, or do you throw exceptions?
I need to check to see if a cookie has been previously created:
var startnum = readCookie('a1');
if (document.cookie.indexOf('a1') == -1){
var startnum = "0";
[code]....
I have the following:
<script language="JavaScript">
<!--
window.onload=function (){
var pwinput1 = document.getElementById("tfOtherJobTitle");
pwinput1.onkeyup= function(){
if(this.value = "test"){
document.getElementById("pbRegistration").disabled=false;
}
}
}
</script>
for a button called "pbRegistration" that checks to see if the value of textbox (tfOtherJobTitle) equals "test" and on completion of the typing "test", it enables the button. Why isn't it working?
I have a form that produces a few checkboxes via a server side script. Once on the page, the source looks like this...
<tr>
<td><input type="checkbox" name="access" value="1" checked /></td>
<td><input type="checkbox" name="view" value="1" checked
/></td>
</tr>
<tr>
<td><input type="checkbox" name="access" value="2" checked /></td>
<td><input type="checkbox" name="view" value="2" checked
/></td>
</tr>
...what I'm trying to do is pass through the value of the checkbox
ticked through to a function. This function will then, depending on
whether the box is ticked or not, untick the access# checkbox.
I can pass the number through to my function, but I'm having
difficulty trying to reference the actual checkbox from the script.
This is what I've got so far...
function AM_MenuSelection(opt) {
var myOpt=document.frmNew.view[opt].value;
alert(myOpt);
}
As you can see, I can reference the value of the object, but need to
be able to access the related access# object.
I'm trying to run some code when a H2 element is clicked on an unordered list below it. The problem is, the code runs whether the h2 has a ul below it or not.
h[x].onclick = function(){
var ul = this.nextSibling;
while (ul.nodeType != 1){
ul = ul.nextSibling;
}
So, if I have something like this:
<h2>Subtitle</h2>
<h2>Subtitle 2</h2>
<ul><li>List</li></ul>
Clicking "Subtitle" runs the function on "Subtitle 2". I don't want the function to run unless the next element is an ul. How can I verify that the next element is an unordered list and if not, don't run anything?
<html>
<head>
<script type="text/javascript">
[code]....
I'm using jQuery SVG and would like to check if the browser that the person is using will support SVG --- if not, they'll receive a polite message; is there anyway to check this using javascript?
View 2 Replies View RelatedI need some JS code that will let me check and see if the date the user enters is within certain guidelines. ie...(no less than 2 days out and no more than 90 days out.)
Someone was kind enough to give me this code, but I can't get it to work correctly. Everything always returns false. If I am reading this write, if it returns false, then the conditions are not met.
Any ideas?
function compareDates(myDate, min, max)
{
var now = new Date().getTime();
var then = new Date(myDate).getTime();
var diff = (now - then) / 86400000;
var valid = true;
var min = min * 86400000;
var max = max * 86000000;
if (diff <= min || diff >= max) {
alert(diff + " " + min + " " + max);
return false;
}
return valid;
}
new compareDates("08/10/03", 2, 90);
I'm building a site that requires user registration, I've already built myself a PHP based user registrationg system, and it already has all the usual checks that are required before letting someone sign up (i.e. that the username is unique, that all required fields are filled, that the two passwords match, that the email address is valid, etc..) using PHP, and so I could ship the system as it is.. but.. I wanted to add some JavaScript checks to it aswell (just to be sure, and to save processor power, etc.. you know how it is). Code:
View 4 Replies View RelatedI have a function that works fine if there is more than 1 check box on the form. If there is 1 only then it will not check that box.
function set(n) {temp = document.EquipMaintForm.multiFilterId.length;for (i=0; i < temp; i++) {document.EquipMaintForm.multiFilterId[i].checked=n;}}
Does anyone know why this could be?
I am creating a website where I have to check the password that will be either in Upper Case or Lower Case or Numeric. Can you please tell me anyone that how I will do it by javascript.
View 4 Replies View RelatedI am having 3 textbox where I want to validate them.My first validation is that the house number should not be > 4
Code:
if (document.myfom.house.maxLength > 4)
{
[code]....