How to parse HTML from JavaScript in Firefox?(2) - javascript

Im trying to parse a HTML result of **XmlHttpRequest** in Firefox. Im expecting to receive the HTML result from XmlHttpRequests *responseText* but when Im calling an alert(responseText) nothing is displayed.
Ive followed the example from http://stackoverflow.com/questions/888875/how-to-parse-html-from-javascript-in-firefox but that doesnt work either.
Here is thecode to make myself clear:
<html>
<head>
<script type="text/javascript">
var http1;
var result;
function onPageLoad()
{
http1=getXmlHttpObject();
http1.open("GET", "https://login.yahoo.com/config/login_verify2?&.src=ym", true);
http1.send(null);
http1.onReadyStateChange=stateChanged();
}
function stateChanged()
{
if(http1.readyState==4)
{
result = http1.responseText;
alert("result"+ result);
var tempDiv = document.createElement('div');
tempDiv.innerHTML = result.replace(/<script(.|\s)*?\/script>/g, '');
// tempDiv now has a DOM structure:
alert(tempDiv.getElementById('username').size);
}
else
alert("mircea geoana la zoo");
}
function getXmlHttpObject()
{
var objXMLHttp=null;
if (typeof XMLHttpRequest!= 'undefined')
{
objXMLHttp=new XMLHttpRequest();
}
else
{
objXMLHttp=new ActiveXObject(Microsoft.XmlHttp);
}
return objXMLHttp;
}
</script>
</head>
<body onload="onPageLoad()">
<p>aaa<p>
</body>
</html>

http1.onReadyStateChange=stateChanged();
should be
http1.onReadyStateChange=stateChanged;

I see a big mistake there.. the message on the else branch should read 'miRcea', not 'micea'.. Tell me if this solves your issue, Mr claudiu ;))

this is how you should define the xmlhttp Object:
var xmlhttp;
if (window.XMLHttpRequest)
{
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
else
{
alert("Your browser does not support XMLHTTP!");
}
Check out this w3School tutorial to read about how to properly use AJAX calls and the like.
edit - my bad, only saw the line defining the call for IE6/5. Either way this method is much more clean.

You can only send AJAX requests to the same domain from which the JavaScript originates. And I'm guessing you're not sending your requests from "login.yahoo.com"...

Related

How to load a script in a php file called from a Ajax Request?

I have this JavaScript:
<script>
if (str == "") {
document.getElementById("txtHint1").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint1").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "/npsmart/umts/action_plano/?q=" + query1, true);
xmlhttp.send();
}
</script>
And this JavaScript call a page called getuser.php.
This is the code of getuser.php:
<!DOCTYPE html>
<html>
<body>
<p id="dumb"></p>
<script>
document.getElementById("dumb").innerHTML = "WORK";
</script>
</body>
</html>
What I would like is only to change the paragraph content, called dumb, to WORK. But when I call the page and it loads, my paragraph content keep null.
It's like my Ajax Call Request don't execute the Script Tag.
EDIT:
I have already solved my problem with this simple but genious solution:
function showUser() {
if(query_num == 2){
if (str == "") {
document.getElementById("txtHint1").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint1").innerHTML = this.responseText;
eval(document.getElementById("runscript").innerHTML);
}
};
xmlhttp.open("GET","/npsmart/umts/action_plano/?q="+55555,true);
xmlhttp.send();
}
And in my getuser.php file:
<script type="text/javascript" id="runscript">
document.getElementById("dumb").innerHTML = "WORK";
</script>
I just putted the : eval(document.getElementById("runscript").innerHTML); in my function and then in the php file I called this script using this:
<script type="text/javascript" id="runscript">
So thanks everybody =)
Hope this post can help other people.
JS is not executed automatically from a script embedded in the response.
Since getuser.php is a PHP script there's no need to use JS and have the browser set the paragraph content. Use PHP itself:
<!DOCTYPE html>
<html>
<body>
<p id="dumb"><?php echo 'WORK'; /* or anything else */ ?></p>
</body>
</html>
Otherwise you'll have to use JS eval on the returned AJAX response to have the browser run the JS returned from your script. But I recommend against this.

AJAX: Why does $_REQUEST on server side not contain the variable passed from JS in URL by GET method?

I have three divs saved in an array as simple_html_dom objects. I needed to change a CSS property of two of them on the click of a button. That's easy, but then I also need to make that change in the CSS property (in the simple_html_dom object stored in the aforementioned array) in the PHP script on the server side.
So I figured from my web search I needed AJAX for this. So I read up this tutorial, and I am following this example, and doing something like:
On the client side:
function xyz(var divIdOne, var divIdTwo) {
document.getElementById(params.divIdOne).style.display = "none";
document.getElementById(params.divIdTwo).style.display = "block";
document.getElementById(params.divIdTwo).style.border = "5px solid red";
var xmlhttp;
if (window.XMLHttpRequest) { xmlhttp=new XMLHttpRequest();}
else { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); }
xmlhttp.open("GET","myfile.php?pass_back="+"pass_back",true);
xmlhttp.send();
}
On server side:
foreach($_REQUEST as $requestkey => $requestvalue) {
echo $requestkey.': '.$requestvalue;
}
if (array_key_exists('pass_back', $_REQUEST)) {
foreach ($array_of_divs as $div) {
if ($div->id=$divIdOne) {
$div->style='display:none';
} else if ($div->id=$divIdTwo) {
$div->style='display:block';
}
}
} else {echo 'FALSE!';}
The first foreach loop prints other variables but does not print pass_back. The next if block does not execute at all. The else block executes. This means that $_REQUEST clearly does not contain pass_back. Can anyone pinpoint why, or what I did wrong?
I fail to see the error. How do you check that you're not sending the data properly? I suggest using this piece of code in order to check what your server is receiving from your request:
function xyz() {
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
console.log(xmlhttp.responseText);// Let's see what the server is echoing
}
}
xmlhttp.open("GET","myfile.php?pass_back="+"pass_back",true);
xmlhttp.send();
}
Please, let us know the output.
I would recommend that you use jquery and firebug, and first get rid of the following problem: why is passback variable not received.
Create the file: test.php
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<script src="https://code.jquery.com/jquery-2.1.1.js"></script>
<title>Html page</title>
</head>
<body>
<script>
(function($){
$.post("myfile.php", {
passback: "pooo"
}, function(d){
console.log(d);
});
})(jQuery);
// or if you cannot use jquery
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
// do something with the response, if you need it...
// document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("POST", "myfile.php", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send("passback=pooo");
// src: http://www.w3schools.com/ajax/ajax_xmlhttprequest_create.asp
</script>
</body>
</html>
Then create the file: myfile.php
<?php
if(isset($_REQUEST['passback'])){
echo "ok";
}
else{
echo "oops";
}
Next, download firefox, and download the firebug extension (or you can use chrome's console alternatively). The goal here is to see what is being passed through the network.
Launch test.php in a browser, open the firebug console (or chrome's console),
and debug until you see the "ok" message.

Ajax watch database for changes and execute code

My goal is to more or less send out requests to a php file, giving it parameters like so;
<!DOCTYPE html>
<html>
<head>
<script>
function onsubmit()
{
var id = $_SESSION['user']['id'];
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
window.WhateverVariable = xmlhttp.responseText;
}
}
xmlhttp.open("GET","clientrequest.php?id="+id,true);
xmlhttp.send();
}
</script>
</head>
<body>
</body>
</html>
and keep sending out requests untill my php script returns x value, which will be passed into the window.WhateverVariable, and when the WhateverVariable is equal to 'x' I wish to execute some code;
however, I can achieve this, but when the code is executed, the request is still going meaning the response text will be 'x' and will continuously destroy then re-execute the code, any way to get past this?
if ( the_mini_game_is_not_open() )
{
// send the regular ajax request
} else {
// send the ajax request but with the message that the mini game is open through parameters maybe like ?open=1
}
And on server side deal with this like:
if ( isset ( $_GET['open'] ) && $_GET['open'] === 1 )
{
// pause it or whatever...
} else {
// show the regular results
}
This was what I understood. Sorry if that's not what you want

ajax php call not returning anything

I want php to return a value to ajax. I'm following W3 schools example but no joy.
Here is the javascript/ajax code:
function createReport() {
var xmlhttp;
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("report").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","test.php",true);
xmlhttp.send();
}
I have the following call inside an event handler that I know is triggering (other stuff it does is working fine)
createReport();
and later in the body section of the html I have:
<div id="report">Report will be placed here...</div>
If I run test.php by itself, it correctly shows "return this to ajax" so I know that's working. Here is the php code:
<?php
echo 'return this to ajax';
?>
My understanding is that "Report will be placed here..." will be replaced with "return this to ajax". But nothing happens. I don't see any errors listed in the firefox or IE consoles either. Any ideas?
I personally do not think the w3cschools a good place to learn ( see http://www.w3fools.com/ ).
It may be that the problem occurs because of the order that you set the ajax, you did:
XMLHttpRequest/onreadystatechange/open/send
is preferable (if you do not follow this order may occur several flaws in older browsers):
XMLHttpRequest/open/onreadystatechange/send
Note: do not worry, the "open(...)" does not start listeners.
Listeners only work after the "send(...)"
Another reason may be that you did not create "error handling" of XMLHttpRequest.status, it serves to verify faults in the server response.
Try this:
<script>
function XHR(){
if(window.XMLHttpRequest){//outers browsers
return new XMLHttpRequest();
} else if(window.ActiveXObject){//IE
try{
return new ActiveXObject("Msxml2.XMLHTTP");
} catch(ee) {//IE
try{
return new ActiveXObject("Microsoft.XMLHTTP");
} catch(ee) {}
}
}
return false;
}
function createReport(){
var xhr = XHR();// call ajax object
if(xhr){
xhr.open("GET", "test.php", true);//setting request (should always come first)
xhr.onreadystatechange = function(){//setting callback
if(xhr.readyState==4){
if(xhr.status==200){
document.getElementById("report").innerHTML=xhr.responseText;
} else {//if the state is different from 200, is why there was a server error (eg. 404)
alert("Server return this error: " + String(xhr.status));
}
}
};
xhr.send(null);//send request, should be the last to be executed.
} else {
alert("Your browser no has support to Ajax");
}
}
</script>
<div id="report">Report will be placed here...</div>
<script>
createReport();//prefer to call the function after its div#report
</script>
To prevent cache, replace:
xhr.open("GET", "test.php", true);
by
xhr.open("GET", "test.php?nocache="+(new Date().getTime()), true);
At first glance I don't see anything wrong on your js code, so I bet it will probably be a problem locating test.php in your folder structure.
With firebug check the call your javascript AJAX it's doing, and check if the file test.php is being correctly assesed.
I did not find anything wrong with W3Schools' Ajax example, after testing the code that follows (which was pulled from their Website).
Possible factors:
Missing <script></script> tags
Make sure you have JS enabled.
Make sure your browser supports it.
You may have forgotten to change the button's call to the proper function.
Working and tested code using FF 26.0 and IE version 7
Pulled from W3 Schools Website (example) and slightly modified to prove this works.
Result when clicking on the Change Content button:
return this to ajax - as per your PHP code.
<!DOCTYPE html>
<html>
<head>
<script>
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("report").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","test.php",true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="report"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="loadXMLDoc()">Change Content</button>
</body>
</html>
PHP used: (test.php)
<?php
echo 'return this to ajax';
?>
Other possible factors:
If on a local machine, your server doesn't support PHP or is not parsing PHP properly, or is either not installed or configured properly.
If on a hosted service, make sure PHP is available for you to use.
Files are not in the same folder as executed from.
try{
request = new XMLHttpRequest();
}catch(trymicrosoft){
try{
request = new ActiveXObject("Msxml2.XMLHTTP");
}catch(othermicrosoft){
try{
request = new ActiveXObject("Microsoft.XMLHTTP");
}catch(failed){
request = false;
}
}
}
if(!request)
{
alert("Error initializing XMLHttpRequest!");
}
function Create_Ajax_Query(LinkToFile,Parametrs)
{
window.document.body.style.cursor='progress';
request = new XMLHttpRequest();
var url = LinkToFile;
var params = Parametrs;
request.open("POST", url, true);
request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
request.setRequestHeader("Content-length", params.length);
request.setRequestHeader("Connection", "close");
request.onreadystatechange = newinfo;
request.send(params);
}
function newinfo()
{
if(request.readyState==4 && request.status == 200){
window.document.body.style.cursor='default';
alert(request.responseText);
}
}
Hope its useful!
The code looks correct. it runs just fine on a local environment.
I would advise to look at the "Network" tab in the developer tools to detect any errors may occurs on the server side. You can also use console.log() to follow the javascript actual flow:
function createReport() {
var xmlhttp;
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
console.log(xmlhttp); //to show the entire object after statechage.
console.log(xmlhttp.readyState); //to show specific parameter.
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("report").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","test.php",true);
xmlhttp.send();
}

Questions to create a nested list retrieved from an XML-file and displayed in xHTML

The objective is to display a list of URLs in an HTML page. The list is retrieved from another file (currently in XML-format).
Validator: What is the proper xHTML mark-up for a list generated by JavaScript and still validate properly?
I assume the reason is that JavaScript-code inside [ul]'s is not accepted. Is this correct? Is there another solution?
The code below does produce the list anticipated, but it creates a warning (pls see below, 2.).
<ul>list A
<li>item A1</li>
<li>item A2</li>
<ul>List B
<li>item B1</li>
<script type="text/javascript">/* <![CDATA[ */
if (window.XMLHttpRequest)
{ xmlhttp=new XMLHttpRequest(); } // code for IE7+, Firefox, Chrome, Opera, Safari
else
{ xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } // code for IE6, IE5
xmlhttp.open("GET","/test-code/panorama-list2.xml",false);
// xmlhttp.open("GET","/test-code/panorama-list2.xml",true); //this does not work. xmlDoc is null.
xmlhttp.send();
xmlDoc=xmlhttp.responseXML;
var x=xmlDoc.getElementsByTagName("item");
for (i=0;i<x.length;i++)
{ document.write('<li class="menu2">'+'<a href="');
document.write(x[i].getElementsByTagName('link')[0].childNodes[0].nodeValue);
document.write('">');
document.write(x[i].getElementsByTagName('description')[0].childNodes[0].nodeValue);
document.write('</li>'); }
//]]></script> //This is line: 136
</ul>
The JavaScript used in the code above is called using the synchronous method and thus creating the Warning:
"An unbalanced tree was written using document.write() causing data from the network to be reparsed. For more information https://developer.mozilla.org/en/Optimizing_Your_Pages_for_Speculative_Parsing
/ Source File: /test-code/index2.htm / Line: 136"
The solution is to use the asynchronous method similar to the code below placed into the section.
The solution is NOT to simply setting 'true' in the function xmlhttp.open (..., ..., true);.
<script type="text/javascript">//<![CDATA[
function loadXMLDoc()
{
if (window.XMLHttpRequest)
{ xmlhttp=new XMLHttpRequest(); } // code for IE7+, Firefox, Chrome, Opera, Safari
else
{ xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } // code for IE6, IE5
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
xmlDoc = xmlhttp.responseXML;
var txt = "";
var txt1 = "";
var x = xmlDoc.getElementsByTagName("item");
for (i=0;i<x.length;i++)
{
txt = x[i].getElementsByTagName('description')[0].childNodes[0].nodeValue + "<br />";
txt1 = x[i].getElementsByTagName('link')[0].childNodes[0].nodeValue + "<br />";
}
{
document.getElementById("myDiv").innerHTML=txt;
document.getElementById("myDiv1").innerHTML=txt1;
}
}
xmlhttp.open("GET","panorama-list2.xml",true);
xmlhttp.send();
}
//]]></script>
That does take care of the Warning.
I assume a solution would be to combine these 2 examples of code.
That's what I am trying:
The Variables 'txt' and 'txt1' retrieve the last entry of the XML-file.
How do I get all entires as well? The amount of entries varies.
Here is the big question:
How can I create a proper list using the asynchronous method and obtain a result like in the initial code example where the list is generated by stepping through the XML-file?
After all, is there is another, better or simpler solution? The file with data for the list shall not be part of the xHTML mark-up.
At last an actual page using the initial code example. The list is revealed by hovering over the button at top-right: http://www.halo-photographs.com/2011-Cascata-da-Bernina/index.htm (yes, this is my own page)
Thanks for your attention.
you code is an soup..
you need refactor that
now with jquery
in the load the you page
you should put somthing how that
$(document).ready(function(){
BeforePrepareList();
});
function BeforePrepareList()
{
var xmlRequest = XmlHttpRequestResolver();
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
var xmlDoc = xmlhttp.responseXML;
// you need parse string response a array or use xslt, the next
// is simple for each
ListSetting(xmlDoc);
}
xmlhttp.open("GET","panorama-list2.xml",true);
xmlhttp.send();
}
function XmlHttpRequestResolver()
{
if (window.XMLHttpRequest)
return xmlhttp=new XMLHttpRequest(); // code for IE7+, Firefox, Chrome, Opera, Safari
else
return xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); // code for IE6, IE5
}
function ListSetting(rawdata)
{
ListPopulate($("_PUT_YOUR_LIST_ID_HERE").get(0), rawdata);
}
function ListPopulate(el, items) {
el.options.length = 0;
if (items.length > 0)
el.options[0] = new Option('All', '');
// THAT IS AN SIMPLE EXAMPLE, CHANGE FOR CREATE tag <a />
$.each(items, function (index,item) {
el.options[el.options.length] = new Option(item.[PROPERTY_A], item.[PROPERTY_B]);
});
}
and .....
more information here
invoke xml and transform http://www.ibm.com/developerworks/xml/library/x-ffox3/index.html
examples de http request http://www.jibbering.com/2002/4/httprequest.html

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