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JavaScript - Finding The Position Of An Element
Hello, I've been trying the find the (x,y) co-ordinates of an element. I've been using;
Code: document.getElementById(element).style.top document.getElementById(element).style.left However this doesn't always work in my script. Now, I've googled how to find the position of an element. And come accross many scripts which supposedly all find the position of any object. Some are very long scripts and some are very short all using a variety of methods. Incidently none of which work, they all return (0,0). I have a question, why would someone create a script to do what one line of code can do? Am I missing something. If I understand why it may help me work out why my script isn't working. Thank you. Similar TutorialsI need to find the position of an element on the page relative to the browser window. Its part of a popup calendar script (and no, they don't want to change it so please don't suggest jQuery date-picker etc) The script uses these functions http://www.mattkruse.com/javascript/...on/source.html to find the position of the anchor to pop up the calendar next to it. Now the client wants to make the calendar fixed when the user scrolls so that it always stays on screen. The most graceful solution is using css position:fixed (I'm aware it doesn't work in IE6 - that's not a problem) I've been using the getAnchorWindowPosition function to get the coordinates but the numbers its giving are wrong (to different degrees depending on the browser) It was only 200px out in the Y axis in Firefox but in IE7&8 its off the screen. I've tried googling for an answer but I can't seem to find a workable solution, mostly I've been coming up with absolute position scripts or 'just use jquery' answers. hi all, I was wondering if someone could help me about my problem I want to change the position of my div when the user scroll the page. Example: <div style="position:absolute;bottom:10px;> Scrolling text </div> I want to change the position to fixed when the user scroll the page using javascript. hope you could help. So I have created a simple calendar (http://www.akapa.org/newsite/events/calendar.htm) and I have a bunch of "More Info" buttons I made from cells. In a table cell to the right are a bunch of hidden DIV's that all appear when you rollover a "More Info" button, obviously giving more details about the calendar date/event. My problem is that I have to give an exact "top" css position to every one of these hidden div's every single time I add a new event to the calendar. I want to dynamically tell each hidden div to match the "top" css position to match the top position of each "More Info" button. How do I do that? I have a floating div that stays at the bottom of the browser window while the user scrolls down a long page. The div reads "scroll down for more". How can I determine the current position of the div in relation to the top of the page, not the top of the browser window. I need to determine this because I would like to hide the div when the user scrolls to the top of the last page. I have looked at offsetParent, offsetHeight, scrollHeight, etc. I have the code for everything except determining the position of the div, or the distance of the div from the top of the page. The 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? I'm new to javascript and am not sure why this works in firefox and not chrome. I am trying to create a script that keeps an object fixed horizontally while bing positioned absolute vertically. if I replace the toPP variable in document.getElementById('fire').style.top = toPP; with say '50px' it will move the element down 50 pxs, but how I have it currently it doesn't do anything in chrome Code: <script type="text/javascript" >
window.onscroll = function()
{
if( window.XMLHttpRequest ) {
var x = 0 -document.documentElement.scrollTop;
var toP = String(x);
var toPP = toP + "px";
document.getElementById('fire').style.position = 'fixed';
document.getElementById('fire').style.top = toPP;
}
}
</script>
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! I need to convert a position:fixed element to position:absolute when the user resize their browser window below 1000px. Right now it does nothing. The element always keeps the fixed positioning even after resizing the window. Here's what I have right now: Code: <!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<base href="http://www.area51entertainment.co/" />
<title>Emoto <?php echo "$section"; ?></title>
<meta charset="UTF-8" />
<meta name="verify-v1" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta name="author" content="Andrew McCarrick" />
<meta name="robots" content="index, follow" />
<style type="text/css">
body,html {
background: #FFFFFF; /* Old browsers */
color: #000000;
font-family: Verdana;
margin-right:auto;
margin-left:auto;
max-width:1000px;
padding: 0px;
margin-top: 0px;
margin-bottom: 0px;
}
</style>
<link rel="stylesheet" href="emoto/style.css" media="screen" />
<link rel="shortcut icon" type="image/x-icon" href="/favicon.ico" />
<link rel="apple-touch-icon" href="http://www.area51entertainment.co/TouchIcon.png" />
<link rel="apple-touch-icon-precomposed" href="http://www.area51entertainment.co/TouchIcon.png" />
<link rel="image_src" href="./logo.png" />
<script language="javascript" src="emoto/float.js"></script>
</head>
<body>
<div class="wrapper">
<div id="header_float">
<div class="header_wrapper">
<div class="logo">
Picture
</div>
<div class="links">
Home | Settings | Notifications | Requests | Messages | Search Bar
</div>
<div class="links_right">
Profile Link/Sign-Out
</div>
</div>
</div>
<div class="content_wrapper">
Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2
Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2
Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2
Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 T
est2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2Test2Test2 Test2
</div>
</div>
</body>
</html>
style.css Code: a:link {color: #FFFFFF; text-decoration: none;}
a:visited {color: #FFFFFF; text-decoration: none;}
a:active {color: #FFFFFF; text-decoration: none;}
a:hover {color: #3399FF; text-decoration: none;}
.wrapper{
min-height: 2000px;
min-width: 1000px;
}
#header_float{
width: 100%;
min-width: 1000px;
height: 35px;
left:0;
right:0;
top:0;
position: fixed;
background: #49963A;
z-index: 1000;
}
.header_wrapper{
width: 1000px;
height: 35px;
margin-right:auto;
margin-left:auto;
padding: 0px;
margin-top: 0px;
margin-bottom: 0px;
color: #FFFFFF;
}
.logo{
float: left;
width: 150px;
height: 25px;
font-size: 26px;
position: relative;
top: -1px;
left: 8px;
}
.links{
float: left;
width: 670px;
height: 25px;
position: relative;
top: 7px;
}
.links_right{
float: right;
width: 180px;
height: 25px;
position: relative;
top: 7px;
}
.content_wrapper{
position: relative;
top: 35px;
width: 995px;
min-height: 450px;
}
img{
border: 0px;
}
float.js Code: if (screen.availWidth<=999)
document.getElementById('header_float').style.position = 'absolute';
else
document.getElementById('header_float').style.position = 'fixed';
Can anyone direct me to the source of this carousel or something similar? http://www.murdockyoung.com/projects...-house/images/ Thanks in advance! Hi there I have this problem where there is something wrong with the variable scope, but I cannot find it, the first problem I have is that the program doesn't work, and the second is the error with the variable scope. Please can you help me fix it. Code: var count = 0;
function gimmeRandom()
{
var rand = Math.floor(Math.random()*10)+1;
count++;
}
function countToRandom()
{
for (count = 1; count <= rand; count++)
{
console.log(count);
}
}
console.log("Counting to a random number");
gimmeRandom();
countToRandom();
console.log("Counting to another random number");
gimmeRandom();
countToRandom();
console.log("There has been "+count+" random numbers");
Reply With Quote 01-13-2015, 10:34 PM #2 Old Pedant View Profile View Forum Posts Supreme Master coder! Join Date Feb 2009 Posts 28,311 Thanks 82 Thanked 4,754 Times in 4,716 Posts Any variable declared (using the var keyword) *inside* a function is ONLY visible inside that function. So your rand variable can NOT be seen, at all, in your countToRandom( ) function. Hi, I have what I thought was a fairly simple problem that I would be able to solve on my own, but the code I have found is just too complicated for me to understand, so id appreciate any help. I think what i have is similar to the knapsack problem, but I have a really simple version of it. http://www.ms.unimelb.edu.au/~moshe/...psack.html#def Say I have a relatively small array of numbers: 2, 2, 3, 3, 4, 4, 5, 5, 5, 6, 7, 8, 9, 10. I just need to verify true or false if a combination of these numbers will add up to 21. The numbers will obviously be changing, ( and in array size), i guess i could just use if statements but it would be stupid and go on for ages. Could anyone point me in the direction of some simple code, or easy to understand way to go about this problem? Thanks Okay, this should be an easy one. I'm a JS newb, so be kind The code I have right now is an autosuggest feature, but currently, it only finds exact matches, not partials. I want it to find partials. I know the line of code I need to rewrite, but I can't figure out what JS function to use. For example, if a user types "pizza", i want "pepperoni pizza" to show up, not just things that start with "pizza". Code: // str is the string that the user is typing in
// this.aNames is an array containing all the possible strings to match against
// aList is the list of matches from aNames when compared to str
autoCompleteDB.prototype.getMatches=function(str,aList,maxSize)
{
/* debug */ //alert(maxSize+"ok getmatches");
var ctr=0;
for(var i in this.aNames)
{
if(this.aNames[i].toLowerCase().indexOf(str.toLowerCase())==0) /*THIS LINE NEEDS TO BE CHANGED*/
{
aList.push(this.aNames[i]);
ctr++;
}
if(ctr==(maxSize-1)) /* counter to limit no of matches to maxSize */
break;
}
};
Alright so for my website (I've totally revamped it and what not) I want to make a code highlighter for source code / tutorials I've posted. At the moment I'm just using some css: Code: div.code
{
font:1em "Courier New";
margin: 10px auto 10px auto;
background-color: #FFFFFF;
border: thick solid #555555;
color: #000000;
white-space: pre;
font-size: 12;
}
So the code stays neat and in a box. But what I want to do now is somehow make a small javascript function that scans the text inside the html file etc : Code: <div class="code">float TimerTicksPerSecond = 0; float TimerTicksPerMillisecond = 0; int value = 0; std::string s = "hello world"; </div> and can format it so float and int is blue, "hello world" is red etc. Be a great help if someone can point me in the right direction. As from the javascript I've done myself I can't see it being to hard. I'm just unsure how to scan for text inside like I have above. Cheers Myth. Hi i need to find the highest average from all of the averages entered in this code, but i have to use an if statement only, no arrays. Could some one help please? Code: // ** Work out average ** //
average= readingSum/totalReadings
// ** Put average into a category and display everything ** //
if(average<5)
{
catergory1=alert("Location is " + region + "\nNumber of weekly readings taken is " + totalReadings + "\nTotal of readings is" + readingSum + "\nAverage is" + average + "\nLocation is Dry");
}
else if(average>=5 && average<20)
{
catergory2=alert("Location is " + region + "\nNumber of weekly readings taken is " + totalReadings + "\nTotal of readings is" + readingSum + "\nAverage is" + average + "\nLocation is Normal");
}
else if(average>20)
{
catergory3=alert("Location is " + region + "\nNumber of weekly readings taken is " + totalReadings + "\nTotal of readings is" + readingSum + "\nAverage is" + average + "\nLocation is Wet");
}
// ** Find Highest average ** //
Thanks. I'm having a hard time trying to get this script to work. I am trying to write a script that finds the highest of 5 numbers and places the highest number in the last textbox. Can anybody tell me what I am doing wrong? Code: <HTML>
<HEAD>
<TITLE>COMSC-100-1241 - Assignment #10 - Using "Greater Than" And "Less Than" Logic</TITLE>
<SCRIPT TYPE="text/JavaScript">
function Go(code){
var number1
var number2
var number3
var number4
var number5
var highest
var max
number1 = parseFloat(document.getElementById("number1").value);
number2 = parseFloat(document.getElementById("number2").value);
number3 = parseFloat(document.getElementById("number3").value);
number4 = parseFloat(document.getElementById("number4").value);
number5 = parseFloat(document.getElementById("number5").value);
max = parseFloat(document.getElementById("max").value);
if (code == 0){
}
if (max < number1){
max = number1
}
if (max < number2){
max = number2
}
if (max < number3){
max = number3
}
if (max < number4){
max = number4
}
if (max < number5){
max = number5
}
document.getElementById("max").value = highest
}
</SCRIPT>
</HEAD>
<BODY>
<TABLE BORDER="1" WIDTH="500" ALIGN="center">
<TR>
<TD>
<DIV ALIGN="left">
<B>Instructions: </B> Answer the three questions and press "GO". Your score will appear.
<BR>
<BR>
<B>Input Values: </B>
<BR>
<B>First Number:</B> <INPUT id="number1">
<BR>
<B>Second Number:</B> <INPUT id="number2">
<BR>
<B>Third Number:</B> <INPUT id="number3">
<BR>
<B>Fourth Number:</B> <INPUT id="number4">
<BR>
<B>Fifth Number:</B> <INPUT id="number5">
<BR>
<INPUT TYPE="Submit" VALUE="GO!" onClick="Go(0);">
<BR><BR>
<B>Output Values: </B>
<BR>
<B>Highest Number:</B> <INPUT id="highest">
</FORM>
</DIV>
</TD>
</TR>
</TABLE>
</BODY>
</HTML>
I made some code to factor a quadratic equation and I could use some help finding situations where it finds the wrong answer. If you can find any problems, let me know. Thanks http://www.wdroom.com/factor.html I was hoping someone might be able to help me find an error in this script. I am pretty sure there is an error on line 9, but not sure. Any help is appreciated! <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>Days of the Week</title> </head> <script type="text/javascript"> <!-- HIDE FROM INCOMPATIBLE BROWSERS printdays(); // STOP HIDING FROM INCOMPATIBLE BROWSERS --> </script> </head> <body> <script type="text/javascript"> <!-- HIDE FROM INCOMPATIBLE BROWSERS function printDays() { daysOfWeek = new Array(7); daysOfWeek[0] = "Monday"; daysOfWeek[1] = "Tuesday"; daysOfWeek[2] = "Wednesday"; daysOfWeek[3] = "Thursday"; daysOfWeek(4) = "Friday"; daysOfWeek[5] = "Saturday"; daysOfWeek[6] = "Sunday"; var count = 0; do { document.write(daysOfWeek[count] + "<br />"); ++count; } while (count <= 6); } // STOP HIDING FROM INCOMPATIBLE BROWSERS --> </script> </body> </html> i have this part of code in JS: Code: var receiveReq = getXmlHttpRequestObject();
function getXmlHttpRequestObject()
{
if (window.XMLHttpRequest)
{
return new XMLHttpRequest();
}
}
function getChatText()
{
if (receiveReq.readyState == 4 || receiveReq.readyState == 0)
{
receiveReq.open("GET","getChat_xml.php?chat=1&last=7", true);
receiveReq.onreadystatechange = handleReceiveChat;
receiveReq.send();
}
}
function handleReceiveChat()
{
if (receiveReq.readyState == 4)
{
var chat_div = document.getElementById('div_chat');
var xmldoc = receiveReq.responseXML;
var message_nodes = xmldoc.getElementsByTagName("message");
}
}
then in my getChat_xml.php i have: Code: $xml = '<?//xml version="1.0" ?><root>';
$last = 7;
$sql = "SELECT message_id, user_name, message, date_format(post_time, '%h:%i') as post_time" .
" FROM message WHERE chat_id = " . db_input($_GET['chat']) . " AND message_id = " . $last;
$message_query = db_query($sql);
while($message_array = db_fetch_array($message_query))
{
$xml .= '<message id="' . $message_array['message_id'] . '">';
$xml .= '<user>' . htmlspecialchars($message_array['user_name']) . '</user>';
$xml .= '<text>' . htmlspecialchars($message_array['message']) . '</text>';
$xml .= '<time>' . $message_array['post_time'] . '</time>';
$xml .= '</message>';
}
$xml .= '</root>';
echo $xml;
i get a "cannot cal a method getElementsByTagName of null" ??? i have no idea whats going on, help please? thanks This is my first post on this website. It has a very clean design to it. I think I am going to enjoy myself here :P I am taking a class. And I am very sorry if this post does not belong here. It is a JavaScript class so, my guess was here. My professor has giving us three page sources from random sites. I can not figure this out though. This question has a page source from some random math test website. What we are to do with this page source is to figure out the ten correct answers to the question in the page source. No, not by doing the math, but figuring out where in the page source it is hiding. I can not find them for the life of me. I got the other two problems, but of course this is the hardest one Thank you for your help I put the page source in a notepad attach to this post. (My professor has removed parts of codes that included the name of the website he had gotten it off of. He also said the page source may need to be decoded.) I think I found what I am looking for. If you look where question one starts. Itll have <input type="hidden" name="corAns" value="27478035"> But, the answers are A, B, C, and D which would be 1, 2, 3, and 4 for D. So is <input type="hidden" name="numAns" value="4"> The correct line? I think that is to easier. He said this assignment was the hardest out of the three, and well, that was to easy? I'm a bit of a Javascript noob, so please bear with me! I'm trying to create a piece of code that will check a webpage and replace any instances of a specific line of HTML with another line of HTML. The code I have so far doesn't work, but I have a feeling that's down to my awful Javascript skills! For example, in the following code I'd want to replace all instances of <li><a href="index.pdf">Index</a></li> with <li><a href="contents.pdf">Contents</a></li> Code: <div id="downloads">
<p>Please click on your downloads below:</p>
<ul>
<li><a href="index.pdf">Index</a></li>
<li><a href="chapter1.pdf">Chapter 1</a></li>
<li><a href="chapter2.pdf">Chapter 2</a></li>
<li><a href="chapter3.pdf">Chapter 3</a></li>
<li><a href="credits.pdf">Credits</a></li>
</ul>
</div>
The Javascript I have so far is: Code: <script type="text/javascript">
var aEls = document.getElementsByTagName('a');
for (var i = 0, aEl; aEl = aEls[i]; i++) {
aEl.href = aEl.href.replace('index.pdf','contents.pdf');
}
Obviously this is meant to just replaces the a href elements, but I got a bit stuck after this! Any pointers would be much appriciated. |
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