Ajax :: Parsing XML - How To Get Different Child Nodes
Dec 15, 2010
I'm currently working on a pretty straight-forward AJAX application. In this application, I get some XML, and then parse it. An example of what I'm working with is as such:
<?xml version="1.0"?>
<postRoot xml:lang="EN">
<post type="comment" date="January 1, 1970">
<user>athlon32</user>
<content>Hello World</content>
</post>
</postRoot>
Now, I've been able to read the XML with XMLHttpRequest , my trouble is with parsing the results. I've tried tons of things, but I just can't seem to get the different child nodes. Now, let's say we have something like this:
var xml = xhr.responseXML;
var allPosts = xml.getElementsByTagName('post');
Could I use childNode to access user & content? And if so, how? I've tried many things, but nothing is working :/ Is there a better way to parse the results I get back from the server?
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Jul 31, 2004
I'm trying to figure out how I can take user input from a textarea and insert it into a table as HTML. An example:
<script type="text/javascript">
<!--
function echo_input() {
var input = document.getElementById("user_input").value;
var cell = document.getElementById("display_area");
cell.childNodes[0].nodeValue = input;
}
//-->
</script>
<form>
<textarea id="user_input" name="user_input" onkeyup="echo_input();"></textarea>
</form>
<table>
<tr>
<td id="display_area">test</td>
</tr>
</table>
The childNodes[0] that the script keeps editing is the text node that starts out as "test". The problem is that I want the text that I put in the table to be parsed if any markup is in it (so that a <br /> will become a break, and not literally printed out as "<br />"), something that the DOM automatically escapes. It seems a very cumbersome means of doing this is to write a javascript parser, which would go through the text and create different types of nodes as it stumbles upon markup.
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Apr 26, 2010
So there is this string i need to parse as xml:
<station><code>GB0923A</code><city>ABERDEEN</city><population>215.000</population><component><name>Nitrogen dioxide (air)</name><unit>_micro;g/m3</unit></component><component><name>Nitrogen oxides (air)</name><unit>_micro;g NO2/m3</unit></component></station>
Now what I do is: -use this function to create xml doc from string
[Code]...
the stirng shown at the beggining is passed to "response" (var response= xmlhttp.responseText;). Now for some reason all 3 values displayed are null... I am trying to figure why for last 2hrs but i cnt see any reason why they shouldnt be the actual values of nodes in the string...
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Jul 23, 2005
There doesn't seem to be any mechanism to "clear" a node of all
it's children (not that its necessary very often, but I have come
across situations where I'd like to clear a node of all it's
children before appending other nodes). I've come up with two
possibilities: Code:
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Feb 23, 2011
I have two arrays. english() and french(), and each contain 10 quotes. I then have this HTML
Code:
<p><span class="pnum"> 1</span><span class="phrase"></span></p>
<p><span class="pnum"> 2</span><span class="phrase"></span></p>
<p><span class="pnum"> 3</span><span class="phrase"></span></p>
<p><span class="pnum"> 4</span><span class="phrase"></span></p>
<p><span class="pnum"> 5</span><span class="phrase"></span></p>
<p><span class="pnum"> 6</span><span class="phrase"></span></p>
<p><span class="pnum"> 7</span><span class="phrase"></span></p>
<p><span class="pnum"> 8</span><span class="phrase"></span></p>
<p><span class="pnum"> 9</span><span class="phrase"></span></p>
<p><span class="pnum">10</span><span class="phrase"></span></p>
Look at the comment in there to see what I need to do. I assume I would use .childNodes to get the end result, but I've never worked with nodes before, how would I reference the 2nd child (aka .phrase) and loop out the array in there?
Code:
function eventSource(e) {
var IE = document.attachEvent ? true:false;
var DOM = document.addEventListener ? true: false;
if (IE) return event.srcElement;
else if (DOM) return e.currentTarget;
}
function setUpTranslation() {
var phrases = document.getElementsByTagName("p");
for (var i=0; i < phrases.length; i++) {
//Here I need to reference the second child and change the inner content to french[i]
}}
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Feb 2, 2011
I have been scratching my head on this one for a couple days:
Code:
function hideAll(){
var education = document.getElementById("education").childNodes;
[Code]....
As far as I know, this should be working the way I expect it to (set the display of all the childnodes to none), but I guess I'm missing something. Is it not possible to instantiate a variable using childNodes without choosing a specific index of the array? I just assumed it would work like any other array
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Nov 21, 2010
I have this code that when links are clicked the elements are erased. The issue that I am facing is that I want to update the order of the attributes "id" and "var_id". Basically when you remove the first or the second element to update the order. I am not very savvy with DOM so I have hard time developing that functionality. I hope you guys can help me with that.
<html>
<head>
<script>
function removeElement_e(divNum)
{
var d = document.getElementById('e');
[Code]...
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Feb 23, 2010
HTML parsing error:unable to modify the parent container element before the child element is closed(kb927917) My page is not getting displayed In IE although running good in chromr and mozilla.... And after refreshing in IE it is displayed properly.
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Aug 7, 2010
I've been searching the web for a while now, and I haven't come across a conclusive solution for memory leaks due to replacing nodes with frequent AJAX updates. I wrote a class that pulls an RSS feed frequently (e.g. every 5 seconds) and updates an HTML element with new information. In the process, it removes the old nodes and replaces them with new ones. It works fine visually. The only problem is that it has terrible memory leak complications; when I put the script on to run, it increases the memory usage by about 1MB every few seconds at an accelerated 1000-ms delay between updates!
(That's 100MB every few minutes!) I discovered this when I let the script run for a few hours straight, not thinking anything of it, and when I returned to my computer, it was frozen up Opera seems to be the worst at its memory management on this script, Safari and Chrome are in the middle, and Firefox seems to handle it the best, but nonetheless there are memory leaks in all four. (I haven't tested IE yet, but based on what I read, I would expect that it might even be worse than Opera!)
[Code]....
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Apr 6, 2010
What's the best way to wrap all the nodes between two nodes in DIV tags? Is it possible with the DOM? I have code similar to the following:
HTML Code:
<h3>First header</h3>
<p>First paragraph</p>
<p>Second paragraph</p>
[code].....
How can I achieve this with the DOM, without resorting to doing something like a string replace?
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Jan 18, 2007
Hi, I'm fairly new to AJAX, but I've been able to retrieve HTML and plain-text documents without any trouble. However, I haven't figured out how to retrieve it in XML format. Basically, here's the script that's supposed to retrieve and parse the data when you pass it the url of the page generating the XML data:
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Jan 8, 2011
I'm trying to use it to load in an XML file and output some data. I followed a tutorial on it but my XML file isn't loading.[code]Now my thinking is that when the document loads, it alerts me that the jQuery is running, and it does this. I had hoped that after closing that alert, another one would show saying that the XML file has loaded - This would ensure that the function 'parseXML' has been called, but it does not return an alert or populate my#xml_addressbook div.My index page is at the root, and both my XML file and the javascript file are in a folder, as shown below.[code]
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Jan 7, 2010
I'm building an application with a c#.net server and a good bit of jquery on the front end. I'm having trouble getting/parsing data from c#. In the C#, I am doing a db call to pull the information for all users, and putting it into xml format:
string xml = "<?xml version='1.0' encoding='utf-8' ?>";
xml += "<Users>";
while (res.Read())
{
[Code].....
When I run the application, I'm getting the 'in AjaxSucceeded [object XMLDocument]' alert, but I cannot get inside of the 'each' loop.
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Oct 3, 2006
Since XMLHTTP Request does not support loading of XML from other
servers, I decided to use a trick:
load XML into hidden iframe and then get that XML with JavaScript to
parse.
But, is this a good idea? I am stuck. How do I get XML loaded in the
iframe and pass it on to JS function for parsing?
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Jan 27, 2010
I have the following simple ajax call in a .ready() function :
[Code]...
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Jul 19, 2011
Maybe it isn't really best practice (as it turns out) to use both jQuery and Dojo in the same application, but there are things I like about both libraries (for example jQuery is faster with animations, while Dojo has interface objects I like better). Nonetheless, best practice or not, I use both and that seem to create some complications.
The first time I load content via AJAX with jQuery DOJO seems to properly parse the checkboxes, datetime pickers, etc. which are sent with the new HTML. However, it seems the second time the parser won't react. I'm calling dojo.parser.parse() every time I load content with jQuery's $.ajax call. So basically my code looks like this:
Code:
$.ajax({
url: 'ajax.php',
success: function(data){
[code]....
It's like when an ID has been treated once by Dojo it doesn't want to do it again. there's a way to let Dojo know it has to parse the same IDs again?
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Dec 6, 2009
Through an AJAX implementation, I am receiving a SQL Query result that has:An object's attribute delimited by a comma.An entire object (database row) delimited by a colon.This is an example response to make it more clear for you.
1,Jeremy,130,80;2,Lauren,370,300;3,Jeancarlos,200,200;4,Luke,330,70;5,Bloom,392,108;
What I am trying to achieve is placing all of this data into an array. I've set up a little test bed to try and get this to work; this is all I have so far:
var testString = "1,Jeremy,130,80;2,Lauren,370,300;3,Jeancarlos,200,200;4,Luke,330,70;5,Bloom,392,108";
var testArray = new Array();
testArray = testString.split(";");[code]....
get a multi-dimensional array that has information for each person. Example:
FinalArray[0][0] = 1
FinalArray[0][1] = Jeremy
FinalArray[0][2] = 130
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Aug 6, 2010
Consider following html code
<p id="oliver">
<a id="oliver1" href="/oliver1/">Oliver Twist 1</a>
<a id="oliver2" href="/oliver2/">Oliver Twist 2</a>
<a id="oliver3" href="/oliver3/">Oliver Twist 3</a>
<a id="oliver4" href="/oliver4/">Oliver Twist 4</a>
</p>
Applying JavaScript to above html as following:
[Code]...
Why are anchor nodes pointing to href and text nodes pointing to [object]? As anchor and text both are objects therefore all outputs from indices 0 to 7 should be [object].
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Jul 14, 2009
I want to use ajax to submit a dynamic form which can be filled with infinite elements. The only problem is passing all of the values of those elements through the ajax and onto my jsp page where they will be processed.
Code:
"promptIds=" + document.getElementsByName("promptId")
That is one of the arrays that I send and I am using jsp, but in any case, how would I parse the array to be usable?
Code:
String promptIds = request.getParameter("promptIds"); System.out.println(promptIds);
The above code outputs "[object HTMLCollection]". How would I go about parsing the array of elements?
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Jul 6, 2009
I am trying out $.ajax instead of getJSON for debugging purposes. Because getJSON did not report an error in IE (6,7 or 8) and I am
trying to figure out why a jQuery plug-in is not painting my returned images to the screen in IE but is in other browsers. So I tried this. Interestingly enough, it hits the error event in IE but not firefox, safari and the rest and I don't know why (this code works great and renders my data just fine in FireFox and the rest). I know my returned json is valid:
$.ajax({
type: "GET",
url: "http://localhost:59396/sss/sssHandler.ashx?
action=getproducts&ids=" + ids,
[code]....
I don't know what else to do to troubleshoot why IE is having so much trouble with the returned JSON or just executing the function(data)
using either getJSON OR this. I have set the headers not the cache also in the response. IE refuses to enter my function(data) on the response.
[
{
"ImageTag": "u003cdiv class="CarouselItem
"u003e<p><img src="http://www.xxx.com/image/
[code]....
Same result. Firefox and the rest had no issue. IE still exited the $.ajax and my error method kicked in. No rhyme or reason whatsoever and I tried the IE Dev tools... nothing. About the only thing I get is this: Line: 163 Error: System error: -1072896658.Line 163 which is simply the line: function() { alert("An error has occurred. try again."); This has got to be the most f*d up situation I've been in and I need to get this working! I just cannot understand why IE can't parse a getJSON or $.ajax response, that is impossible or else there would be a huge meltdown with jQuery.
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Mar 18, 2009
I have a page [parent], on it is a link to a popup [child] that opens up a form. On the [parent] page is a list of entries from the table in the DB.
So basically once a form is submitted on the [child] page, I want the list of entries on the [parent] page to be refreshed
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Feb 9, 2011
<div class="userbox posts" id="pst146996">
<div class="imgholder">
<img alt="Chris Hardin" src="http://codebix.com/bp/1633.png">
<div style="margin-left: 20px;" class="commentbox">
[code]....
i want already select .postlike in $(this) now i want to select the tagh1 who is in .commentboxelements.i want to change the h1's inside text 1 to 2 so i write the code
$(this).closest('.posts').children('.commentboxelements center h1').html('1');
i try this but it's not worked anyway how i can do this.
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Jan 5, 2012
so i wrote this slider with some help from an admin, everything works as I would like it to but I'm trying to make it a plugin so i need to tighten up a certain part of the code:
(function( $ ){
$.fn.jmSlider = function() {
// get total width of all li elements in the slider
var wrapWidth = 0;
[code]....
what i would like to do is instead of using "li:first" and "li:last", i would like to use first-child and last-child so the element doesn't need to be a li, in can be anything that is the direct child of the parent container.
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Oct 28, 2010
I have created parent child checkboxes. When one child is selected, then parent of that child, other child of same name and parent of that same name's child will be selected... Now I want if I unchecked any child, then only same name of child and parents should be unchecked or if I unchecked Parent Child, then same name of parent and child will be unchecked.
[Code]...
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Aug 29, 2011
So, I'm trying to do something that should be very simple, which is to parse an XML with .ajax. The code that isn't working is:
[Code]...
moving the alert outside of the .find function, it pops up the alert (although it doesn't change the rightContentText). Obviously the $(data).find function is not firing, but why?
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Aug 26, 2011
I have a domain: example.com; which is the parent.And a subdomain: api.example.com; which page 'receiver.html' is being loaded in an iframe, child of parent. Both pages set document.domain = example.com.
I'm trying to adapt this code:[url] but Idon't want to load jQuery from the <iframe> again but I need to have the method $.ajax() working from the <iframe> otherwise it would be a cross-domain request and the browser would abort it. I tried ingenuously to set via $('iframe')[0].contentWindow.$.ajax = $.ajax() and I just got a shortcut to the parent page jQuery method. I also tried to "clone" it using $.expand (true...) but the method doesn't work for me; probably because of the complexity of the objected I'm trying to clone. So is there a way for me to use jQuery to have only a $.ajax() method in the <iframe> ? I've thought even about creating a XHR in the child-iframe and then use that in the $.ajaxSetup ({xhr: THATNEWXHR}) but I couldn't do it. I mean, I want to use the XHR factory from jQuery (which has fallbacks for IE, etc) but it has to be created from the iframe-child.
Maybe there is other way to make the AJAX call come from the child-iframe.
If you're wondering "why don't you load jQuery from <script> in the child-iframe", there is a reason... As I'm using jQuery plugins + my own custom javascripts + other independent scripts I created a compiler which minifies each file and bundle them in one. The advantage of this is the reduction of HTTP requests. So "why don't you load that bundle inside the child-iframe?", because it's ugly and Twitter doesn't... Yeah, I like to take Twitter as a reference and I think if they were able to make it so can I;
I got to work in most browsers except IE and Operaby doing it with pure javascript.
I'm "attaching" the code for you guys to test. If you open it with Chrome, Safari or Firefox you will receive 2 alerts one with the return of $.get() and another with the return of a request made via XMLHttpsRequest object. Otherwise (if you open it with IE or Opera) you'll get 'undefined' in the first alert but the real return in the second.
This is the example.com/index.htm:
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