DOM Element.style.property Isn't Preloaded With CSS Values
Aug 5, 2011
I ended up having to preset style with JavaScript.
Here is what I did.
CSS Code:
JavaScript Code:
HTML4Strict Code:
The first time I hit toggle, nothing happens. The second time I hit toggle, the hidden list appears, but only because I used JavaScript to set the display property.
My workaround is to do this in the HTML after the element to be toggled.
JavaScript Code:
Putting this code in the elements onload event property didn't work either, which I found odd, but I read that it was not the recommended way of doing this.
I can't figure out why the CSS declaration didn't load into the JavaScript HTML DOM. I suspect it's some sort of order of execution thing, like the difference between the two following function declarations.
I have a word bank for a javascript crossword puzzle I'm working on. What I want to do is when a user clicks on a word in the word bank, it crosses itself out. I have tried:
For some reason I cannot get jQuery.css('name') to return a style property that was assigned by a class. However, it returns the property if it was assigned by style="". Has anyone else run into this issue? Bug?
i have a top navigation bar with a clickable down arrow. once clicked a drop-down will appear. there are about 5 to 6 click downs. the content in the click downs are store in an external html file and i use an iframe to display it. so if 1 arrow is clicked content will show and if another is clicked while the 1st stays open, it should replace the 1st one. <snip/> I am getting an error that says TypeError: Cannot read property 'style' of null. the code line it's referring to is the one below with the stars:
if the dt-element in one of the definition lists has a specific css-property (e.g. length > 100px) then the dd-element with the css-class "subtitle" in the same definition list should be removed.
I'm doing a very simple expand/collapse function using 'slideToggle'. The button that triggers this event simply says 'Expand/collapse'. I want this text to change depending on whether an element is visible or hidden.
So I have a table. With jquery I change border properties of several td. If later on in the code those same td have their background color changed by jquery, their borders return back.
Even if nothing is changed, nevertheless after some time some of the borders would seemingly randomly suddenly show up. I am working on a maze so this really spoils the game.
if I have an html page that uses the <style> or a <link> to call a style sheet these properties aren't available to JavaScript is there a good way to access them? eg
<html> <head> <title>expandable text area</title> <style type="text/css">
It works if I specify the actual background image within the function, so I know the image is there, and I know it's been properly assigned to div2, but div1's background image doesn't change.
I'm trying to get rid of some javascript errors related to fadein/fade out. If you go to my test site here [url]... you will see the green ticks and red warning boxes working fine when entering information, but I get 92 (!) errors when checking the error console. [code]...
I have added some style="opacity:1; background: white;" properties to my HTML thinking that was the problem, but it makes no difference. Still getting the error related to line 124.
I would like to be able to test if an element already has a style applied to it. This style might either be an inline style, or come from a stylesheet. I'm writing a plugin which needs to apply a CSS style to an element if it's not already there.
I've been having this issue with Javascript that is just not getting resolved for a while. What I am basically doing is building a simple web browser extension that injects javascript on certain pages. I am using Firefox, Chrome and Safari. The issue I am having is accessing these so called "special properties" on a particular page. They look like the regular classNames, id, textContent and such but don't appear to be standard. It would be very helpful if I can access them.
A particular example would be in Yahoo Mail. When you are in your inbox you have list of messages. With each message row there are associated attributes. You can get to them with your web inspector or if you search for the div element with id "PagedTableView_wrapper", then follow the first child and then second child and you get a list of these messages being rendered. Each one of those rows has the regular className properties and such but also has "_checked", "_focused", "_selected" that look like custom Yahoo ones. I basically want to read those.
The issue is I can't. I always end up getting a null exception, as if it doesn't exist. I can read the className and the other standard ones fine, but not the special ones. (I've verified its the same element as well). I have tried the DOM navigation route with indexing, jQuery and XPATH, all with the same result. The weird part is that I can see them with the webInspector! Whats even more strange is that if I run firebug or commands in the Console, it actually works! But it doesn't work for my injected code/extension! Baffled.
In my website I constructed a script that changes the image.sources of several images. The changes are made by calling a JS-function. The function is invoked by selecting an option in an html-form. In my second post below I pasted the code.
The problem is that each time the images are changed the browser starts to load them all again, although all images were PRELOADED in the <head> section of my HTML page. It takes time every time a user invokes image changings, and also the visual effects are worsened. How can I prevent the browser from loading the images again each time?
I'm working on a web map, in which you click on a building to open a pop-up with a photo of that building in the window. Rather than use a generic pop-up, I've styled it to look similar to the parent page. Since my map contains over 200 buildings, initially this meant creating over 200 separate html pages with the image source and dimensions for each building photo. That's clearly very inefficient and not a process I want to duplicate! Therefore, I needed some dynamic code to generate the content in the pop-up.
I successfully used a cookie to pass a building ID variable to the pop-up and use that to grab the associated photo from a directory and that worked fine. However, I ran into problems because the photos are not identical in size, and I also needed to get the image width and height. I tried preloading the image using a standard image caching script and used that to obtain the width and height of the image. Then, I used document.write to place those variable in the <img> tag and place the photo on the page.
The problem is that the cached image will not display on the page when it loads, only if I hit refresh. Can anyone tell me how to get around this? Here's the code I'm using. I call this function inside a <p> tag in the body of the page:
if (document.images) { bldg = new Image(); bldg.src = "../../Columbia/bl/bl_" + BldgId + ".jpg";
theWidth = bldg.width; theHeight = bldg.height; }
function showImage() { var photoSrc = "<img src='../../Columbia/bl/bl_" + BldgId + ".jpg'"; var insertPhoto = photoSrc + " width='" + theWidth + "px' height='" + theHeight + "px' alt='" + BldgId + " Photo not available' />";
document.write(insertPhoto);}
Is there another way to get the image's dimensions BEFORE I place it on the page?
I'm Stephen Martin, an undergraduate Psychology student and researcher. Although I am a self-proclaimed tech geek, the extent of my knowledge ends abruptly at any sort of coding. The paradigm: I am currently investigating the decision making strategies in a particular population (I cannot reveal too much, lest our study be scooped by competing researchers in the field). The paradigm that we use is built through a package called MouseLabWeb [URL]. MLWeb basically provides an interface for researchers to create a html/php/js/css website that presents a grid (table). A small example is shown on the aforementioned website. The javascript functions allow each participant's events to be recorded, timestamped, and written to a MySQL database. This allows the researcher to know which cells the participant viewed, in what order, for how long, and ultimately to which decision the participant came.
Additionally, the PHP/HTML creates the table, but the data within it is populated by the javascript. This is a blessing and a curse. Here is why. The problem: The javascript offered by MLWeb allows the cells to be randomized. This is necessary, because in such paradigms, counter-balancing is required, otherwise there would be order effects (e.g., people tend to automatically read from the upper left) that are not controlled for. So the order of the columns and rows are randomized, the data which is then placed into the html/php table.
For the current study, we want the cells corresponding to particular types of information to be shaded differently. For example, we'd want cells that contain bad information to be dark, cells that contain neutral info to be grey, and cells that contain good information to be white. The problem is that setting these values (style="background-color: #XXXXX) only applies to the table as created by the PHP. It only affects the position, and does not consider the information that it is filled with.
I'm writing a script that dynamically generates a menu table. Each TD has an onclick property which serves as a link. Everything works properly in other browsers since setAttribute onclick works. However, this function does not work in IE, and you're supposed to do this instead: elementName.onClick = "blah";
Here's my code that works in all browsers but IE: Code: var truePath = "document.location.href=" + "'" + "/" + urls[i] + "'"; cell.setAttribute("onclick",truePath); cell.onclick = truePath;
For IE, if I set the cell.onclick value to truePath, nothing happens when I click on the menu. However, it works fine in Firefox and Opera because of the setAttribute function. How I could get this to work in IE? My script is complete besides this part... I hate IE. Why can't they follow the rules?
I am trying to select a div element based on its display property. Due to some reasons I can't use Id to select this element, DIV element is structured like this:
I have a script one of my pages which is designed to prevent a user from selecting the same option from a drop down more than once. Here is the script:
Code: function changeSelect(sel) { option = sel.selctedIndex; var sels=document.getElementsByTagName("select");
[Code]....
Here is the basis: A user is greeted with a page of blank fields. On the right is a drop down menu which has the select options you see. The user enters the address of a few DNS servers, then selects their main and least favorite DNS of the group. If there is a "Main DNS" already selected, it will blank the originally selected drop down, and fill in the newly selected drop down.
The problem I'm having, is when the user calls their settings back, the PHP will load the proper "main" and "last" options, but I have to select two more to get it to blank. I know this is because the script is called with an "onchange" function, but I've tried using "onLoads" and I've also tried making a quick function to "select" the option, but to no avail.
