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?
I got a file upload form (in asp), besides of checking if the extension is .jpg .bmp etc, how do i check if the file really is an image? so pple wont be able to change an exe file to jpg and upload it right away.
View 2 Replies View RelatedI'm creating a script to get the next photo without reloading a webpage. To make it more smoothly, I fadeOut() the old image, and fadeIn() the new image.
However, when the new image is not yet fully loaded, the fadeIn() method doesn't really make sence. So I wonder if there is a way to first show an ajax loader, and after the new image is fully loaded, fadeIn the new image.
This is how far I got so far :-)
I first have to remove the first img tag, and inject a new one in the DOM, otherwise the old image flashes for a second, before the new one appears ;-)
[url]
I'm try to set up a webpge that will play a live flash video on the left-hand side(got that part working) and display one slide of a presentation(jpg) to the right of the video. I would like to be able to control when the slide image changes by having some js check a text file on my server. The text file could contain something as simple as "Slide1.jpg". I will manipulate the text file with some code I've already written. Is there some simple js code I can put in my page that will cause it to check the text file every 5 seconds, and if the content of the file has changed, to refresh the image on the page with the new image? I'm try to get away from the "clicking" sound that is caused by doing a simple refresh of an Iframe.
View 3 Replies View RelatedHow 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/?
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]....
I have a site with a news pages and I'd like the navigation to include a
blinking 'NEW!' when that page has been updated within the last three days.
It works fine for the one page (if you're on the news page, it works great)
but I can't figure out how to check the time/date stamp on a file other
than the one currently loaded ...
I'm trying to check whether a string is all digits. This part is
easy:
function allDigits( str ) {
var foo=str.split( '' ); // better than charAt()?
for( var idx=0; idx < foo.length; idx++ ) {
if( !isDigit(foo[idx]) ) {
return false;
}
}
return true;
}
I'm not sure about how to implement isDigit(). Is this the best way?
function isDigit( s ) {
if( s.length > 1 ) {
return false;
}
var nums=﾿?'
return nums.indexOf(s) != -1;
}
I have inherited a project with some code that runs fine for some
frames but not for others. This is a frames based project, and
(apparently) sometimes there is a parent frame, and sometimes not. When
there is no parent frame, you see this error message:
'parent.frmUpper.document' is null or is not an object
I would like to know if there is a way to check for the existence of an
object by name so I can determine what to do next.
i am declaring an array in javascript
var a = new array();
now before assigning a value to the ith element of this array, i have
to check if some value has already been assigned there. But at the
time of defining array, it gives undefined values to the array. Is
there a way/function, thru which i can find, whether a particular
index value was assigned before or not.
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?
The page I am working on will have a series of checkboxes. The boxes will be in the format of "parent" with one checkbox and then a "child" div with multiple checkboxes. The idea is being able to check a parent checkbox and have all the checkboxes in the preceding child div get checked as well.
Here is the layout:
<div class= "parent_div">
<label>
parent
</label><input type='checkbox'/>
</div>
<div class = "child_div" >
<label> child </label>
<input type = 'checkbox'/> .....
This does not work. The checkboxes do not get checked.
I know that the selector is working because if I assign a function to them like this:
$(".parent_div INPUT[type='checkbox']").
change(
function(){
var child = $ ( this ).
parent().
next( ".child_div" ); $ ( child ).
children ().
change (
function (){
alert (
"changed"
); }); });
It will work, the function get"s assigned to each checkbox in the div. Why my boxes are not getting checked? On a side note I found this curious, if I try to access the checkboxes by specifying a selector type in the children method like this :
$( child ).
children ( "INPUT[type='checkbox']" )
or
$( child ).
children ( "input" )
It doesn't select the boxes. In case anyone mentions it I know that the child divs are not actually children of the parent divs, all these values are coming from a database and the names were chosen based on the database relationships.
$(document).ready(function(){
This is the code i created i wonder how can i check if the last element has been selected and how to go start at first element.
I'm having a problem where a button no longer triggers an event after I changed it through an AJAX call.Problem is, once AJAX has updated the DIV, the contents in RAM is different from what I see when I check the page source (CTRL-U in FireFox/Chrome).What tools are there to display the current contents of the DOM? I generally prefer to use Chrome/Iron, but if there are better tools for Firefox, I'm also interested.
View 2 Replies View RelatedI'm having trouble trying to check if a key is down, using javascript.The code below is only a simple test script, and should just write "!" while the left arrow key is down.It seems to be able to detect when the key is pressed, but it doesn't stop when the key is released (on Opera at least - unsure about others).btw: I'm not interested in making it work with IE, as I'll be using other stuff which IE doesn't support anyway (Canvas/SVG).
Code:
<script type="text/javascript">
// keyLeft should be True if Left Arrow Key is down
var keyLeft;
[code]....