Extracting XML Data Using GetElementsbyTagName?
Jun 9, 2009
I'm trying to write code that will extract from an XML file and then display the results. Keep getting a syntax error.
HTML:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>[code]....
My intention was to access all of the tags (name, genre, and hitsong) in the XML file. Thought that var musicianInfo = xmlDoc.getElementsByTagName("*"); would do that. Then, loop through each tag and display the result.
Why isn't it working?
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Oct 30, 2006
I'm slowly discovering the world of JavaScript, so I'm not sure I'm
attacking this problem in the right manner, thus if I'm in the wrong
newsgroup, my apologies.
What I'm trying to do is extract some news items from a web site. To
do this, I'm using Microsoft Word VBA and using the following bit of
script:
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Jan 18, 2011
What will be the best way to extract dynamically changing information from a web page that holds XML?I have to extract some data from multiple web pages.These sites contain XML code that dynamically reloads (and changes) parts of the page.Since only small parts get a refresh (perhaps 200 bytes every 5 seconds) it wouldn't be efficient (and also might lead to negative reactions from the server) to reload the whole page (about 40k) every time.How could I best determine these updated contents and send them to the program that further processes them?I am familiar with several programming languages but unfortunately have very little knowledge of internet programming.
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Sep 17, 2010
I'm trying to get some average rgb values from an image in one canvas object and apply them via fillstyle to a rectangle in another canvas object.I have a dropdown that loads an image onChange()="ChangeBaseWood()" into a canvas object. The second canvas object is to be filled with an average color based on the content of the first canvas onClick="GetBaseColor()". For simplicity I've replaced the for loop with just the values of pixel 0,0. Where I think I am assigning the rgb values, the error console keeps reporting that var sample is undefined at the line "var redpart = sample[0].
function ChangeBaseWood(){
var dropdown = document.getElementById('woodvalue');
var woodcanvas = document.getElementById('basewood');[code]....
I've tried various things to assign the redpart,grnpart and blupart but I'm missing something basic.
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Jan 21, 2011
I want to parse data from tables in webpages , there are no problems when I parse regular HTML tables, but it seems to be impossible to get any data from dynamic pages that update themself automatically.how to extract data from dynamic web pages? My goal is to read webpages with an application written in java, parse the page and clean the data and store it in a database.
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Jul 5, 2009
Here is what I'm trying to do. I will pass a directory to a PHP script, that script will then return an array of filenames back to the javascript that called it. In the javascript I want to take the filenames returned and create links to them in an unordered list.
The PHP code to get the filenames is done and when I run the script I get an array that I have formatted into json... an example of the encoded array is as follows...
{"filename:["file01.jpg","file02.jpg","file03.jpg","file04.jpg","file05.jpg","file06.jpg"]};
So here is the jquery I'm trying to use to get the filenames and create my links... But I must be missing something because my variable... data ... is empty... but status is Success.
[Code]...
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Nov 4, 2011
I'm using DOM in javascript to extract data from a dynamically generated html table( table id ="tableId"). Each cell of the table includes an input field to get user input. The problem is below javascript returns "null" always when retrieving the input field value? What I'm doing wrong here?
var mytable = document.getElementById('tableId');
var mytablebody = mytable.getElementsByTagName("tbody")[0];
var myrow = mytablebody.getElementsByTagName("tr")[0];[code]....
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Jul 23, 2005
OK, so let's say, for example, I have a bit of HTML that looks like
this:
<td class="regular1b" valign="top">
<a href="notfound.html"><span class="list5"><b>Lecture
V</b></span></a>
</td>
And I want to save all the text ("all" meaning the tags and
everything) between the <td> and </td>. Using JavaScript, I was able
to isolate the <td></td> by doing:
var w = myTable.getElementsByTagName("TD");
So then I have an IF statement within a FOR loop that looks like:
if (w.item(i).className == "regular1b")
alert(w[i].childNodes[0].nodeValue);
The ALERT() is just a place holder to make sure things are working.
The thing is, nodeValue returns NULL because there's no actual text
within the <td></td> tags; the only thing there is more HTML code, and
the text between the <span></span> apparently isn't considered part of
the <td></td> tags.
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Jan 12, 2004
I'm using the getElementsByTagName method to obtain a customer listing of records. So far so good. However, I also want to reference the child nodes of the customer records.
ie.
<customer id="1234" name="Mr Dodd">
<purchase po="1" value="3.00"/>
<purchase po="2" value="4.00"/>
<purchase po="3" value="5.00"/>
</customer>
I used getElementsByTagName("customer") to obtain the list of customers, but I'm having trouble referencing the child nodes ie. purchase.
Does getElementsByTagName("customer") also obtain the child nodes, or only the matching element?
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Mar 30, 2009
I'm trying to run a script that runs in every browser except IE (IE 7) this is part of the script [code]...
On every other browser the alert(listLines.length) give me the number "16" that is the number of 'li' tags but in IE7 gives me [object] so as soon i get in the 'for' the scrip stop in IE.
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Jul 28, 2005
I've got the following line of code which works fine in IE ...
line_1_numbers [0] = document.getElementsByTagName
('table')[table_index].rows (0).cells (0).innerText;
But it Firefox, it barks saying:
"Error: document.getElementsByTagName("table")[table_index].rows is not a
function"
Any ideas what this means?
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Mar 19, 2007
I have some img tags in my HTML code, and I am trying to implement some manipulation on each image. Thing is, when using document.getElementsByTagName('img'), the JS engine skips every 2nd img tag, so I get an array with only half of the deal.
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Jun 30, 2006
Here's the deal, If I access the page directly on my pc via the file system (i.e. I open up the file via: file::/path../main.html, the page and script runs just fine.
If however I point the browser to tomcat i.e. localhost:8080/blah
firefox spits out the error: getElementsByTagName is not a function.
Any thoughts or pointers? I'm totally confused over this..this is a built in function call?
note: I did an instanceof on the object making the call, and it does indeed confirm it is an object.
ps. I have confirmed I can access the all scripts/css files from the webserver (tomcat)
System:
FireFox (1.5.04), Tomcat, IE6 (also fails, even though I haven't found out how to see the js error details?)
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Nov 10, 2011
I have only IE8 (and older versions) issue with reading Gpx xml.Here is JavascriptCode:
var xmlhttp;
if (window.XMLHttpRequest) { code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else { code for IE6, IE5
[Code]...
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Oct 28, 2009
I was looking at the documentation on this over at [url] and they have the following information:
Summary: Returns a list of elements with the given tag name. The subtree underneath the specified element is searched, excluding the element itself.
My question is this: what do they mean by "subtree?"
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Feb 27, 2006
Are there any ways to edit the html within an element without knowing the TagName?
I'm trying to add html code within a <td> element that has no name or ID. What I do know is that it's the third <td> element within the only <tr> in the table. Assume that none of the elements in the file have IDs or names. The html is produced by a compiled program, so I have no way of editing the HTML in order to add names or IDs. Code:
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Mar 29, 2011
I've been given an assignment to create an alert message everytime a link is clicked on a page. It can be 10 thousand links on the page. Doesn't matter. figure out what the javascript would be?I've tried this but it doesn't work.document.getElementsByTagName("a") = alert("hello");
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Feb 4, 2010
I use Google Chrome because of the Javascript debugger that comes included and I keep getting the following errors with my AJAX script
Code:
Uncaught TypeError: Cannot call method 'getElementsByTagName' of null option.html:23
Uncaught TypeError: Cannot call method 'getElementsByTagName' of null
option.html:40
[Code]....
What is supposed to happen is I press either button then it calls either getoptions1() or getoptions2() which then lists the options using listoption() Then the user selects a color and setoption() gets called. I'm having a problem with either getoption function or the listoption function.
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Feb 1, 2004
I'm working on developing an RSS/RDF/Atom Parser in JavaScript. I've already successfully implemented complete support for RSS 0.9x and 2.0. So far, so good. However, I've run into two minor problems. One is mentioned here, and one is in another post.
The issue that I'm coming across is the case-sensitivity of getElementsByTagName() when parsing standard RSS (XML) tags.
Danny Goodman's JavaScript Bible says that the tag name string that gets passed as the parameter in getElementsByTagName() is case-insensitive. However, this is speaking in terms of HTML and the HTML DOM. I'm working with XML, and getElementsByTagName is handling the XML tags as being case-sensitive.
Can someone suggest a way around this? Can a regular expression be used as the parameter? If so, what would the syntax be (as I'm not very familiar with regex)? For example, I want a <textinput> tag to be handled the same as <textInput> (which is the correct syntax).
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Jul 15, 2011
I have an array of HTML tables created in PHP which I send as a XMLHttpResponse encoded with JSON. Is there was a way I could access the table elements which are now in the JSON Object?
Relevant bits:
PHP code:
$verificationListsResponse = array("classeList" => "$classeList", "workCodeList" => "$workCodeList");
$searchResponse['verificationLists'] = $verificationListsResponse;
print json_encode($searchResponse);
[Code]....
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Sep 1, 2011
My getElementsByTagName ("a"); is not returning anything. (well it's returning "0" not the value I should be getting) I'm asking it to find the number of links on my simple html page. (the reason I'm even doing this is just because I'm trying to learn javascript) but the console in Firefox and the Alert window are just returning "0" when it should tell me I have "4" right?
the files are both located in the same folder, locally
this is my scripts.js file
Code:
var linksAmount = document.getElementsByTagName("a");
alert("Amount of Links:",linksAmount.length);
console.log("Amount of Links:",linksAmount.length);
and this is my html file (it's very small)
[Code]....
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Apr 22, 2009
I have a problem in FireFox when using "getElementsByTagName". eg x = xmlDoc.getElementsByTagName("lead_recipient")[0].childNodes[0].nodeValue;
I use this code in my setupPage() function below. It works fine in IE, but in FireFox I receive an 'undefined' error.
I have included a copy of my XML below.
================== Javascript ========================
type="text/javascript">
var xmlDoc;
function loadXML()
{
[Code].....
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Aug 11, 2010
I'm using getElementsByTagName() to retrieve some elements and do something with them. It works fine in FF but not in Chrome and Safari.
In Chrome it says: "Uncaught TypeError: Cannot call method 'getElementsByTagName' of null"
Here's the code:
Code:
function popUpSAPWindow(){
// Find all links in the page and put them into an array.
//Below is the line that gives me trouble
var linksInOrderLinesTable =
[Code]....
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Jul 23, 2005
I want to access all the <div> tags on my page. below is javascript
which is use to access them
var divs=document.getElementsByTagName("div");
this works on IE but is failing on Pocket PC 2003 browser.
any of guys faced this problem..any work arounds?
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Jan 24, 2011
I have been trying to figure this out all day/night. And I have exhausted all my ideas....
so heres whats happening:
Ajax.js:
varrequest = new XMLHttpRequest();
var response;
var currentHeadLineItem = 0; iterator for which <li> node we
select from our xml document response
var lengthOfHeadLineList = 0; Review the offsett for this!!!!
[Code]...
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Feb 21, 2009
I was trying to make simple JS script, but it seems like i have problem.
I have really basic html:
Code:
<?xml version="1.0" encoding="ISO-8859-2"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
[Code]....
AS you see, i have ONE div element, and Firefox alerts the 1 as result, which is correct. But Opera (9) and Ie(7) returns length of 0. How is that possible?
this is intresting. I tryed to use '*' instead of 'div', to search for all elements. FF alerts HEAD, BODY and DIV elements, while opera only first two, and not Div.
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