Testing Image Existence With Side-effects
Oct 5, 2005
I'm trying to write a function to determine whether or not an image exists.
Most people recommend setting the onload event handler. That works like a
charm except that side-effective actions seem to be impossible. I can, as
nearly as I can tell, run alert and opera.postError (I test on IE, firefox,
and opera by the way). I've tried using the 'this' while in the event
handler, setting this.name, test.name, window.document.getElementById(test's
id).name. I just can't seem to find any means of using side effects inside
the event handler.
Below are several examples of things I've tried so far:
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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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Jun 23, 2011
I got a table with td's and each of the got onchange and onclickwhen i change value of a td and click on other td i get the onchange event(of the first td) being fired and then the onclick (of the other td) being firedBUT...if inside the onchange event I use transformNode function , it will result in disabling the onclick event of the other td...How can I solve this issue and make the onclick event being fired ???
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Nov 7, 2010
I was trying to apply 2 javascript effects on one image.on the image. It works like it should until I put in the light box effect.The lightbox also works, it just depends on which order I put them in the code on which one will come through.I am relatively new to javascript and I am learning as I go along. Below I inserted part of my code geared towards these two effects. I know I have everything else in the code correct (the body) because they work individually, just not put together (or maybe I have to put a line of code in the body to enable it to work?). Essentially, I want the image to be dulled out when the visitor opens the page, get brighter when they roll over it, then trigger the lightbox when they click on it.
The easy option would be to use an image swap for the dull/bright mouseOver effect; however, I like the way it is done by tutorialhero.The first three scripts are for the light box and the second two are for the rollover. The style sheets are as follows- lightbox, about page layout, rollover effect. Is it possible to have both these effects on the same image?
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Jul 27, 2011
I am trying to recreate this functionality on my website where you can drag a background image around and when you get ot the edges of the image it bounces back to the edge of that corrosponding side. have a look at the site in question - [url]
So far i have recreated the top left and right edges using
Code:
Here is how i thought the bottom would work
Code:
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Sep 29, 2009
My website has a large banner, that rotates between several hardcoded images with a fading effect. (see the onmouseover demo (lower left) from DynamicDrive)
I also added an image magnifier Jquery script to the page as well.. Click on the thumbnails and the magnified image fades in from the original image to the center of the screen.
In Internet Explorer, this combo works.. the large banner stays at the back, and the magnified image, appears ontop...
BUT.. in Google Chrome (& Apple Safari) - its the opposite. The banner remains topmost and the magnified image apears above everything else but behind the large banner..
Is there anyway to force Chrome to understand which is which? I rather like Chrome and don't want to move back to IE..
PS:: I'll just quick that the whole sha-bang works exactly right in Frontpage Preview as well.. so..
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Sep 21, 2011
I have an image of a circle that is going on a landing page. I need to code it so that onmouseover, the quarter of the circle that is moused over, will change to a short line of text which is a clickable link.My idea is to use photoshop to cut the circle into 4 quarters, put each quarter into a div and line them on the page so it looks whole, than use getElementById with some css to change the index position, so onmouseover the link comes to the top.Before I get started, I wanted to run this by someone to make sure I am on the right track, or if there is a better way to do this. Maybe image mapping?
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Nov 7, 2010
I was trying to apply 2 javascript effects on one image. First, I use this Jquery effect on the image. It works like it should until I put in the light box effect (this is the one I am using. The lightbox also works, it just depends on which order I put them in the code on which one will come through.I am relatively new to javascript and I am learning as I go along. Below I inserted part of my code geared towards these two effects. I know I have everything else in the code correct (the body) because they work individually, just not put together (or maybe I have to put a line of code in the body to enable it to work?).Essentially, I want the image to be dulled out when the visitor opens the page, get brighter when they roll over it, then trigger the lightbox when they click on it.The easy option would be to use an image swap for the dull/bright mouseOver effect; however, I like the way it is done by tutorialhero.CODE
<script type="text/javascript" src="javascript/lightbox/prototype.js"></script>
<script type="text/javascript" src="javascript/lightbox/scriptaculous.js?load=effects,builder"></script>
[code].....
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Dec 1, 2010
How to reproduce this effect in something like JQuery? Specifically I'm looking at the hover effects at the top of the page: [URL]. It looks like a custom JS file from their end, but I'd like to find something a little more mainstream that looks and acts very similarly, especially with the easing in and out of images.
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Jul 26, 2009
I've implemented a photo gallery using Galleria and jCarousel on my site, and have chosen to use custom thumbnails instead of having Galleria generate them for me from the source images.
As far as I can tell, there may be an advantage in conserving bandwidth with this method, but the page also degrades to a nice set of thumbnails that link to the larger images (which is very nice, IMO).
Everything works beautifully, however when viewing this gallery for the first time, instead of the large image fading in nicely as it does in the Galleria demo, it almost kind of "slides" the image into view like it's rendering pieces of it as it loads in the container. This is definitely an effect i would like to avoid, but I also thought that one of the benefits of Galleria was that it pre-loaded images in the background, right?
So why does my gallery appear to be loading these images "on-demand"?
Here's a link to the page in question: [url]
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Jul 3, 2011
Onchange of the dropdown list, the textfield should display either "testing 3" or "testing 4" but nothing is happening.
<form action='submit.php' method='POST' name='form'>
<select name='preset' onchange='preset(this);'>
<option value='test1'>testing 1</option>
[code]....
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Jan 20, 2009
Managed to get stuck over something that should be very simple.
I'm wanting to write the src attribute of an img tag on the client-side.
Doctype is XHTML 1.0 Transitional
In the head, I'm loading a js function that generates the src path. I want to call it and have it re-write the src in an img element with a specific id.
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Mar 14, 2007
I'd like to see and use a javascript to resize an image.
I've creating a site and I'd like that only this image will be resizable automatically based on resolutions (800x600, 1024x768, 1280x1024, ecc...)...
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Mar 19, 2011
I'm trying to flip an image horizontally on the client side. Is it possible to rotate or change the orientation of an image by using JavaScript or CSS2?
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May 5, 2010
I have a gallery that has back/next links below the main image, but I want them to be on each side of the image instead.
My current code looks like this:
Code:
<center>
<br class='clearit' />
<div id="main_image_wrapper">
[Code]...
I'm just not sure how to best do this. And I want the links centered to the height of the image.
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Nov 11, 2011
I have been using the JQuery Cycle plugin on my website and love it! It has so many options and seems customizable to do basically anything. My question is about the previous and next buttons. At the moment I am using next:'#next2, .pics img', prev:'#prev2', to make previous and next arrows underneath the image as well as use the image itself a "next" button. I would like to remove the arrows underneath the image and just use left and right halves of the image as a previous and next button. Previous being the left half and next being the right half of course. I've been searching for this being posted before and have not found any discussions on it. Also, the JQuery Slideviewer does what I'm trying to accomplish: JQuery Slideviewer Demo
if(zeroLeft >= pictWidth/2) { var uiprev = ui.parent().prev().find("a"); (jQuery(uiprev).length != 0)? uiprev.trigger("click") : ui.parent().parent().find("a:last").trigger("click"); } else { var uinext = ui.parent().next().find("a"); (jQuery(uinext).length != 0)? uinext.trigger("click") : ui.parent().parent().find("a:first").trigger("click"); }
Is there a way to incorporate this type of button in JQuery Cycle? It seems easy enough to make the image a next button I feel like dividing it between the two shouldn't be that much more difficult.
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Mar 7, 2009
I didn't want to write iPhone there.have any idea on how to do this? But most important, it IS possible, right?
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Oct 5, 2010
I have a sliding vertical menu in my page in the left side and in the right side i have a text say for eg: Home.
So when i click on home, i need the left side vertical menu to slide and open and the home in the left side should get highlighted. How do i do this in javascript?
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May 26, 2009
I am building a client-side and server-side solution and want to use JSON through Ajax in both directions. I have ASP or JavaScript server-side, though Microsoft's support of server side JavaScript seems nil, so I am reluctantly conceeding to use ASP. I'd appreciate suggestions on available solutions to encode/decode JSON on the server-side (ASP or JavaScript). I don't plan to load jQuery server-side so that rules out plug-ins. I'd also like to know what is the latest client-side encode/decode for JSON. Is it built in jQuery or a plug-in? In both server and client, decoding JSON securely is key, so using eval () to decode is out.
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Jun 1, 2009
I am developing a web form using python cgi which has two list boxes. On selecting a value from the listbox1, the list box 2 should get auto populated with appropriate values (which are taken from the DB). I have written a javascript function to get the selected value from the list box1. But I am struck with passing the values from the javascript to the python function written in server side in which I have written the DB related stuffs.
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Jul 20, 2005
I have a Hyperlink within a String like below:
sSql = "SELECT DISTINCT " + "'Action' = '<center><a
href='+char(34)+'ChangeRequest.aspx?ID='+cast(Chan geRequest.ChangeRequest_ID
as nvarchar) +CHAR(34)+'>Open</a></center>',"
I want to invoke a Client side javascript function and pass the value
of the ID. How can I accomplish this such when a user clicks "Open" he
goes to a new window with the same ID.
I tried this but it does not work:
On Server side:
sSql = "SELECT DISTINCT " + "'Action' = '<center><a href= 'javascript:
NewWindow('+cast(ChangeRequest.ChangeRequest_ID as nvarchar)+
CHAR(34)+)'>Open</a></center>',"
On Client side:
function NewWindow(myID)
{
window.open("ChangeRequest.aspx?ID="+myID,"WindowName","width=500,height=600");
}
</script>
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Mar 30, 2009
The code on how to make this page into 2 columns. Right now I have everything in 1 long row of 6...id like to see how to make it 3 and 3 side by side...
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Aug 22, 2011
On the server side I have a php generated session parameter.
I need to pass it to javascript on the client side page.
I saw on the web the following solution code...
I tried it but it did not work.
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Sep 11, 2009
I have the following PHP code, which uses server-side validation, which works fine. It the user leaves the text field empty it stores an error in a session array which is outputted on the page where the $_GET['id'] variable came from. I also implemented a snippet of javascript code that just checks to see if the cell is empty and throws up alert box. The problem is that both the javascript code and php error validation are both running when I click submit. The PHP code should be a backup to the javascript code in case the user has javascript turned off. The client-side validation should be the default. Not sure if this change should be made in my PHP Code or Javascript Code.
PHP CODE:
session_start();
require_once("../Modules/Connection_Functions.php");[code].....
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Jul 20, 2005
I have a web form that has a checkbox on it and a textbox associated
with it. I want the textbox to be displayed when the checkbox is checked
and I want this to happen on the client-side instead of posting back to
the server. The checkbox is a server control (asp:checkbox...). I can
write some codebehind that will display an alert message upon checking
the box that looks something like this...
Page_Load...
Dim s As String
Dim scriptString As New System.Text.StringBuilder
chkExpDate.Attributes.Add("onclick", "alertmsg()")
scriptString.Append("<script language=JavaScript> function alertmsg()
{")
scriptString.Append("alert('hi'); }<")
scriptstring.Append("/" + "script>"
s = scriptstring.ToString()
Page.RegisterStartupScript("startup", s)
End Sub
I used this as a test to make sure the server control was running the
script. But, when I change the script to assess the value of the server
control checkbox such as checked = true, I get errors and if I just try
to display the asp:textbox, it doesn't work either.
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Jun 9, 2011
[URL]I've been using the advice and code here to start incorporating expanding/collapsing tables into my work, but I'm hitting a little problem. I want to have multiple such tables side-by-side (each headed by a picture and populated by a lightbox, which isn't the issue), but Dreamweaver wants nothing to do with the idea. I don't really even know if it's possible, but if it is I'd like to know what sort of changes I might need to make to achieve it.
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