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JavaScript - Detect Element Is Exist Or Not
i have a problem. i want to check that whether an element with a specific id exist on page or not. example
Code:
<script type="text/javascript">
function bgcolo()
{
if(document.getElementById("jj") == null)
{
return red;
}
else
{
return green;
}
}
</script>
</head>
<body>
<table width="100%" border="1">
<tr>
<td id="oo" bgcolor="return bgcolo();">bvbv</td>
</tr>
</table>
<div id="jj">fggftrytyyyyyyyyy</div>
</body><
Similar TutorialsThe bit of code in bold in the code below is giving me this error in IE: Error: Code: Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; Tablet PC 2.0; InfoPath.2; OfficeLiveConnector.1.4; .NET CLR 3.0.30729; OfficeLivePatch.1.3; MSN OptimizedIE8;ENGB) Timestamp: Tue, 16 Mar 2010 15:07:11 UTC Message: HTML Parsing Error: Unable to modify the parent container element before the child element is closed (KB927917) Line: 0 Char: 0 Code: 0 URI: http://www.mateinastate.co.uk/users/mateinastate Code: Code: if(document.getElementById('msn1').innerHTML=="")
{
document.getElementById('msn1').style.display='none';
}
if(document.getElementById('yahoo1').innerHTML=="")
{
document.getElementById('yahoo1').style.display='none';
}
if(document.getElementById('skype1').innerHTML=="")
{
document.getElementById('skype1').style.display='none';
}
if(document.getElementById('facebook1').innerHTML.toLowerCase().substr(0,18)=='<a href="http://">')
{
document.getElementById('facebook1').style.display='none';
}
else if(document.getElementById('facebook1').innerHTML.toLowerCase().substr(0,11)=='<a href="">')
{
document.getElementById('facebook1').style.display='none';
} else
{
document.getElementById('fbook-add').innerHTML='Facebook Profile';
}
What it's saying isn't actually true (I don't think)... this is how the section is laid out: Code: <div id="submenu1" class="anylinkcss"> <ul> <li class="contact-pm"><a href="/index.php?do=pm&act=new&to=$RateViewProfileUserName$&returnurl=$ReturnURL$">PM me</a></li> <li class="contact-email"><a href="/index.php?do=email&id=$RateViewProfileUserId$">E-mail me</a></li> <li class="contact-msn" id="msn1">$RateViewProfileUser-profile_msn$</li> <li class="contact-yahoo" id="yahoo1">$RateViewProfileUser-profile_yahoo$</li> <li class="contact-skype" id="skype1">$RateViewProfileUser-profile_skype$</li> <li class="contact-facebook" id="facebook1"><a href="$RateViewProfileUser-profile_facebook$"><span id="fbook-add"></span></a></li> </ul> </div> <script type="text/javascript" src="/html_1/js/contact-information.js"></script> Does anyone know why this might error in just IE? Hi, I'm relativly new to JS and brand new to the forum so you might need to dumb down your replys for my slightly lacking knowledge. That being said I do have a very solid grasp of html, css and am getting there with JS and its various frameworks. I'm integrating wordpress into an existing site for a friend and currently have the main blog page appear in a DIV. This is the best way to integrate in this case due to many reasons mostly of way the site is constructed. Code: <div class="scroll-pane" id="scrollbox"> WORDPRESS BLOG </div> My issue is that links within that DIV, in the blog, when clicked redirect the page. The simple answer to this would be to have them just open in a new page, which I can easily do with the below code. Code: function Init()
{
// Grab the appropriate div
theDiv = document.getElementById('scrollbox');
// Grab all of the links inside the div
links = theDiv.getElementsByTagName('a');
// Loop through those links and attach the target attribute
for (var i=0, len=links.length; i < len; i++) {
// the _blank will make the link open in new window
links[i].setAttribute('target', '_blank');
}
}
window.onload = Init;
But what I'd rather it do is have any link clicked inside the DIV to reload in that same DIV, similar to an iframe, but obviously without using an iframe, due to it's compatibility issues. Is this possible by editing the above code? If not what do I need? Thanks in advance for any help! My javascript compiler is telling me that my function doesn't exist. However its just because the function isn't compiling right... if someone could give it a look and tell me what i'm doing wrong i would greatly appreciate it. Code: <script type="text/javascript">
function Country(f,s,h,k)
{
var Country=['Alabama','Alaska','Arizona','Arkansas','California','Colorado','Connecticut','Delaware','Florida','Georgia','Hawaii','Idaho','Illinois','Indiana','Iowa','Kansas','Kentucky','Louisiana','Maine','Maryland','Massachusetts','Michigan','Minnesota','Missippi','Missouri','Montana','Nebraska','Nevada','New Hampshire','New Jersey','New Mexico','New York','North Carolina','North Dekota','Ohio','Oklahoma','Oregon','Pennsylvania','Rhode Island','South Carolina','South Dakota','Tennessee','Texas','Utah','Vermont','Virginia','Washington','West Virginia','Wisconsin','Wyoming'];
var first=$('#'+f).val();
var second=$('#'+s);
var hidden=$('#'+h);
if(first=="USA")
{
hidden.css('display','block');
var options="";
for(var i=0;i<=(Country.length-1);i++)
{
options+="<option value='"+Country[i]+"'>"+Country[i]+"</option>";
}
second.html("<option selected='selected'>Choose one...</option>"+options);
} else {
hidden=$('#'+k);
hidden.css('display','block');
}
}
</script>
Code: <tr style="background-color: #f4fbee">
<td width="324"><font face="verdana" size="2">9.) Country</font></td>
<td width="324">
<select name="Country" id="Country" onchange="Country('Country','state','stateother1','stateother2');">
<option value="none" selected="selected">Choose one...</option>
<option value="Australia">Australia</option>
<option value="Canada">Canada</option>
<option value="UK">United Kingdom</option>
<option value="USA">United States</option>
<option value="Other">Other</option>
</select>
</td>
</tr>
that is where I call the function. Hi all Experts I am in a need of a simple javascript script that can verify if a cokie exist If it exist: (replace the below and show) You already upgraded. If not exist: I would like it to show: You account is not upgraded yet Please upgrade your account, click here to upgrade<br> <center><A href="url"><img src="picture"></center> also need seperate script to set the cokie Hope u understand what I want thank you Never mind. I found a solution to get it working. I still don't know why it occurred, but I don't have the time to fulfill my curiosity like I could when I was a teenager. Hi all, I am working with the following code: Code: window.onload = (window.onload) ? window.onload : function () {
for (var i = 0; i < onload_functions.length; i++) {
eval(onload_functions[i]);
}
}
...and it's used like this: onload_functions.push('runSomeJS()'); The idea is that IF the "window.onload" function doesn't exist, I supply my own. My problem is that this code also uses an array: var onload_functions = new Array(); Now this array will not be present if the "window.onload" function is not present. So I need to also define it conditionally. I tried this: onload_functions = (onload_functions) ? onload_functions : new Array(); ...but it doesn't work. I also tried: onload_functions = (onload_functions) ? onload_functions : onload_functions = new Array(); ...doesn't work either. I'm sure the solution is simple, but I'm just not seeing it. Any ideas? Thanks! -- Roger iframe Info: id="AssessmentsIFrame" button Info: id="wpv_1266351" I really want to learn a way determine whether custom fonts via @font-face got downloaded by the client machine and then set styles differently depending on whether they got the fonts or not. To start I could run a fonts-inactive.css file to setup the styles to look nice without custom-fonts (this is the base style which should look fine without any JS, flash, custom fonts, etc.). Then run a JS that will run the font-face-rules.css (which attempts to load the fonts via @font-face css rules) - this way if JS isn't active then no fonts will be loaded and the document will default to its fonts-inactive.css. If the JS does run then font-face-rules.css will try to send the fonts. So the JS needs to somehow determine whether the fonts worked or not. If the fonts worked then the JS would run the fonts-active.css which would alter some style rules to make the page look better with the custom fonts (since we know they got the fonts we can tweak the page a little to look better with them). If the fonts didn't work then the JS needs to not run the fonts-active.css and instead just exit out leaving the document with its original, unaltered rules from fonts-inactive.css. (since we know they didn't get the fonts we leave them with the baseline stylesheet which optimizes the appearance for default fonts). Sadly I don't know the first thing about Javascript so I am hoping that you guys might be able to help me come up with something that works. Cheers, line I have been searching for a way to accomplish a unique task for a while. Here's the situation: We have several users who are in locations where YouTube is blocked for various reasons. On our homepage we would like to embed a YouTube video except for when YouTube is blocked and then embed an alternative video that is hosted off one of our servers. Is there a way to use JavaScript to detect whether or not YouTube is available and then put in the correct video? Thanks in advance! hey all is there a code where I can detect if the browser is IE6 or IE7 and send them to another webpage? my current design is not compatible with IE6 or 7 and i want to make a new page that's compatible. thanks! I am attempting to make an page on my website where visitors can set my website as their homepage. I am trying to make my website read which browser my visitors are using and then redirects them to the page for the right browser where I can tell them how they can set my website as their homepage. Basically I need exactly the same thing as THIS. Could you explain to me in plain English how I can realize this. This is what I know have: Code: <table width="759" border="0" align="center" cellpadding="0" cellspacing="0" >
<tr align="center">
<td width="378" height="28" align="right">Selecteer jouw browser </td>
<td width="16"></td>
<td width="365" align="left"><form id="browserSelection" name="browserSelection" action="customizeBrowser" method="GET"><select name="browser" size="1" id="browser" onchange="document.browserSelection.submit();"><option value="ff" selected>Firefox</option><option value="ie">Internet Explorer</option><option value="chrome">Chrome</option><option value="opera">Opera</option><option value="safari">Safari</option></select></form></td>
</tr>
</table>
________________________________________ Please tell me if I make any English mistakes in my posts. I am trying to write as perfectly possible. im totally new to javascript and i would like to know how i can make my internet page detect the resolution of someone's computer and on base of that use different 'html pages' so that the background fits etc.
Hi all, The code I am working on uses the idea of detecting mime type support, to see if the add-on is there. Then if the mime type is not supported, it assumes, the add-on is not installed. (No other add-ons have this mime type.) However, there is a problem, if someone disables the add-on, the there is no mime type handler in navigator.mimeTypes['the/MimeType']. Is there some way to detect if an add-on is installed, and also if the add-on is enabled? Thanks, Grae Hi once again! Is it possible to detect was the mouse on the move or not in the moment when button is released ? Hi all,i'm wondering how to detect select option changes.For example i want the data in database changed when i click on update button and if there are changes on the select option side.If the values on the select option are not changed,i can't update the data..Is there a way to achieve it?Thanks a lot...
Hi, I am currently detecting for Shockwave within IE by doing the following: Code: var isInstalled = false;
if (window.ActiveXObject) {
var control = null;
try {
control = new ActiveXObject('SWCtl.SWCtl');
} catch (e) {
return;
}
if (control) {
isInstalled = true;
}
}
This works as expected and if it fails to detect Shockwave I tell the user to install Shockwave. The problem comes when AcitveX is disabled as it still returns the same message that it's not installed. I would prefer to be able to include an extra step to detect if ActiveX is disabled, in which case I can tell the user to enable it rather than giving them false advice. My only idea would be to detect for an ActiveX Object that every IE user should have installed. Any ideas on what that ActiveX Object could be or any ideas on how I could tackle this problem are greatly appreciated. Thanks Hi.. Anyone can help me to reslove tis.. How to detect iTune plugin in IE Browser...Am using navigator.plugins[] array..its working in firefox,chrome but i need for IE browser..pls help on tis very urgent.. i need script will detect connection speed and redirect to a page:
I have these "editable" divs in my document. When you click them, a text box comes up and you type something and push enter. It changes what's in the div. There is also a blur event associated with the text box. When the user tabs or clicks away, it fires the blur event. Here lies the problem. I have other elements on the page that are clickable. I don't want those clickable things to fire their events if the user is clicking away from the text box, ie. the blur event. This isn't a problem is the user pushes tab, for instance. So my thought was that if i know how the user blurred (via keyboard, or clicking) i could take the appropriate action. Any ideas? Dear all, I would like to know if javascript can detect the screen idle time, if certain time come up in idle, then it will redirect to another page, any help will be appreciate, thanks! Eddie |
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