I am trying to pass a variable from a javascript function to my php file. All I do is extract the user_name from a cookie in javascript and then use AJAX to $_POST the variable to my php file for processing. I do not use a form to submit the POST variable which I have done in the past.
The problem is my $_POST array is not getting passed to the php file. I've looked here and looked at several other suggestions but none work. Do you have to submit the $_POST variable via an html form? I dont think so but maybe I'm wrong. Here is the code:
Javascript -
function clearDoneItems() {
var user_name = getNameFromCookie();
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
alert(user_name);
xmlhttp.open("POST","todolist/clear_done_items.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send(user_name);
displayHomeInformation(user_name);
}
PHP -
<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>Clear Done Items</title>
</head>
<body>
<?php
ini_set('display_errors',1);
error_reporting(E_ALL);
print_r($_POST);
$xml_name=$_POST['user_name'];
$xml_file = $xml_name . ".xml";
echo $xml_file;
/* Here we will use the The DOMDocument class functions to delete
the text nodes.
Format XML to save indented tree rather than one line */
$domxml = new DOMDocument('1.0');
if ($domxml->load('$xml_file') === TRUE) {
$domxml->preserveWhiteSpace = false;
$domxml->formatOutput = true;
// Start Delete process of node
echo "<br>";
$xpath = new DOMXPath($domxml);
// Here we use the The DOMXPath class function evaluate to do the heavy lifting.
foreach ($xpath->evaluate('//doneitems/item') as $node) {
$node->parentNode->removeChild($node);
}
//Save XML to file - remove this and following line if save not desired
$domxml->save('alan.xml');
echo "<strong>XML Document updated.</strong>";
}
else {
echo " <strong>Error in loading XML file:</strong>";
echo "<br>";
print_r(error_get_last());
}
?>
</body>
</html>
Errors on php page:
Notice: Undefined index: user_name in /var/www/bb/todolist/clear_done_items.php on line 16
0
Warning: DOMDocument::load(): I/O warning : failed to load external entity "/var/www/bb/todolist/$xml_file" in /var/www/bb/todolist/clear_done_items.php on line 24
Sorry for the delay in responding. I just wanted to post how I solved issue. I will have to revisit using the $_POST array with AJAX cause I was never able to pass a variable thru it.
Javascript:
// Clear Done Items Function
function clear_done_items()
{
var xmlhttp;
var temp = document.getElementById("list_section");
var temp_list_name = temp.innerHTML;
var str_len = temp_list_name.length;
var list_name = temp_list_name.slice(17,str_len);
var user_name = getNameFromCookie();
if (user_name == list_name) {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("POST","todolist/clear_done_items.php",true);
xmlhttp.send();
} else {
alert("Warning: You Must be Logged in as this User, " + list_name + ", to Delete the Completed Items List");
}
}
and php:
<?php
$xml_cookie = $_COOKIE['user'];
$xml_file_name = $xml_cookie . ".xml";
/* Here we will use the The DOMDocument class functions to delete
the text nodes.*/
//Format XML to save indented tree rather than one line
$domxml = new DOMDocument('1.0');
if ($domxml->load($xml_file_name) === TRUE) {
$domxml->preserveWhiteSpace = false;
$domxml->formatOutput = true;
// Start Delete process of node
echo "<br>";
$xpath = new DOMXPath($domxml);
// Here we use the The DOMXPath class function evaluate to do the heavy lifting.
foreach ($xpath->evaluate('//doneitems/item') as $node) {
$node->parentNode->removeChild($node);
}
//Save XML to file - remove this and following line if save not desired
$domxml->save($xml_file_name);
echo "<strong>XML Document updated.</strong>";
}
else {
echo " <strong>Error in loading XML file:</strong>";
echo "<br>";
print_r(error_get_last());
}
?>
so basically I'm using a cookie to get the user_name variable to php to process from the main page.
Related
I am using jQuery to send a part number from one php file to another.
The part number is received correctly in the destination php file, but when when I try to use it, it does not work.
Here is the strange thing: To test,when I use $mpn=STA-12 (or any other value that exists in table2), in destination php file, the connection is established and the relevant data is extracted, BUT when THE SAME DATA is fetched, it does not work
Here is the destination PHP file:
<?php
$row['mpn'] = $_GET['q'];
include("order/connection.php");
echo "mpn is here : ".$row['mpn']; // It displays STA-12 but doesn't data get fetched!
$mpn=$row['mpn'];
//$mpn="STA-12"; // *** When I actually put this line in, it all works ***
$stmt = $pd->prepare("SELECT * FROM table2 WHERE part_number = :part_number " );
//$stmt->execute(array());
$stmt->execute(array(':part_number' => $mpn));
$row = $stmt->fetch(PDO::FETCH_BOTH);
//... rest of the code
?>
This jQuery script copied from W3:
<script>
function showUser(str) {
if (str == "") {
document.getElementById("txtHint").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("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET","serv.reply3.3.php?q="+str,true);
xmlhttp.send();
}
}
And this is where it is called from:
<form>
<select name="users" onchange="showUser(this.value)">
<option value="">Choose</option>
<option value=" <?php echo $row["mpn"]; ?> ">items</option>
</select>
</form>
The problem is finally solved.
Since the code was copied from another example, the jQuery variable sent over, contained some EXTRA information that when ECHO'ed didn't show.
echo "mpn is here : ".$row['mpn']; that displayed STA-12, actually contained ' string(6) " STA-12" ', which was discovered by doing:
var_dump( $row['mpn']).
This had my head scratching for days.
I am a noob and i am trying to get this script working. It works perfectly in all browsers except IE. I have tried most of the solutions here on stackoverflow but none of them works for me. I am doing some kiddish mistake somewhere which I am unable to spot. Would request your help.
Also just to let you know the DOM Objects format of using appendchild might not work 100% correctly for me since this script basically passes values from a drop down which shows say numbers from 1 to 10 and based on those numbers it pulls up corresponding charts. So if I am viewing chart 1 then i can go ahead and select the drop down to view chart 3 as well. But if we use the appendchild property, it only allows me to see one of the charts by selecting 1 to 10 and it doesn't work unless I refresh the page. So unless deletechild is used I think it would not work, just my guess. Hence, I have commented that section out and I am using the good old method of innerhtml.
This is my JS function.
function showUser(str) {
debugger;
var xmlhttp = GetXmlHttpObject("Browser does not support HTTP Request");
if (str=="") {
document.getElementById("pairname").innerHTML="";
return;
}
/* <-- I HAVE ALREADY COMMENTED THIS OUT & am using a more robust function for this.
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("pairname").innerHTML=xmlhttp.responseText;
//AS YOU CAN SEE THE ALTERNATIVE SOLUTION OF USING DOM OBJECTS HAS BEEN COMMENTED OUT.. SINCE THIS IS ALSO NOT WORKING IN IE FOR ME.
//var wrappingElement = document.createElement("div");
//wrappingElement.innerHTML = xmlhttp.responseText;
//document.getElementById('pairname').appendChild(wrappingElement);
}
}
xmlhttp.open("GET","getimgdetails.php?q="+str,true);
xmlhttp.send();
}
function GetXmlHttpObject(errorMessage) {
var r = false;
try { r = new XMLHttpRequest(); }// Opera 8.0+, Firefox, Safari
catch(e) {
// Internet Explorer Browsers
try { r = new ActiveXObject("Msxml2.XMLHTTP"); }// older IE
catch(e) {
try { r = new ActiveXObject("Microsoft.XMLHTTP"); }// IE 5+
catch(e) {// AJAX not possible
if(errorMessage) { alert(errorMessage); }
}
}
}
return r;
}
AND THIS IS WHERE I AM SHOWING IT
<div id="pairname"><b>Charts will be shown here.</b></div>*
AND this is the Script which receives and sends back the info. SO basically it shows 5 charts for each number 1 to 10.
$q=$_GET["q"];
Echo "<img src=mqluploads/".$q."15.gif?".time()."></img>";
Echo "<br>";
Echo "---------------------------------------------------------";
Echo "<br>";
Echo "<img src=mqluploads/".$q."60.gif?".time()."></img>";
Echo "<br>";
Echo "---------------------------------------------------------";
Echo "<br>";
Echo "<img src=mqluploads/".$q."240.gif?".time()."></img>";
Echo "<br>";
Echo "---------------------------------------------------------";
Echo "<br>";
Echo "<img src=mqluploads/".$q."1440.gif?".time()."></img>";
Echo "<br>";
Echo "---------------------------------------------------------";
Echo "<br>";
Echo "<img src=mqluploads/".$q."10080.gif?".time()."></img>";
Echo "<br>";
Echo "---------------------------------------------------------";
Echo "<br>";
Echo "<img src=mqluploads/".$q."43200.gif?".time()."></img>";
Echo "<br>";
Echo "---------------------------------------------------------";
Echo "<br>";
?>
Many many thanks in advance for your help and for reading this far. I have been struggling with this for the past one week and now finally decided to seek some help. Looking forward to your advice.
Have you checked that your php script is returning some data. Try to access getimgdetails.php?q=str (replace str with correct paremeter) directly in browser.
Also place an alert(xmlhttp.responseText) before this line:
document.getElementById("pairname").innerHTML=xmlhttp.responseText;
This will help you to debug.
I want to display a tree with information about the Catalogue of Life which includes the Kingdom, phylum, order, etc information. I'm using ajax/php to interact with a mySQL database, while using javascript to display and output the information. I have finally completed the things I wanted it to do: expand and collapse on clicking, load only once, etc. But everytime something is clicked below the scroll limit, it bounces back to the top of the page. I researched this and saw something about including 'return false' in the function or the tag, but this did not solve the problem. Am I just putting it in the wrong place? Thanks for your help...
Here is the code: in its php/javascript goodness...
<?php
include ('includes/functions.php');
$connection=connectdb();
$result=runquery('
SELECT scientific_name_element.name_element as shortname ,taxon_name_element.taxon_id as taxonid
FROM taxon_name_element
LEFT JOIN scientific_name_element ON taxon_name_element.scientific_name_element_id = scientific_name_element.id
LEFT JOIN taxon ON taxon_name_element.taxon_id = taxon.id
LEFT JOIN taxonomic_rank ON taxonomic_rank.id = taxon.taxonomic_rank_id
LEFT JOIN taxon_name_element AS tne ON taxon_name_element.parent_id = tne.taxon_id
LEFT JOIN scientific_name_element AS sne ON sne.id = tne.scientific_name_element_id
LEFT JOIN taxon AS tax ON tax.id = tne.taxon_id
LEFT JOIN taxonomic_rank AS tr ON tr.id = tax.taxonomic_rank_id
WHERE taxon_name_element.parent_id is NULL');
set_time_limit(0);
ini_set('max_execution_time',0);
?>
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.1.js"></script>
<script type="text/javascript">
function load_children(id){
if(document.getElementById(id).active != 'true'){
if(document.getElementById(id).loaded != 'true'){
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()
{//actual stuff
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{//change the text
this.active='true'
//document.getElementById(id).innerHTML = xmlhttp.responseText;
var oNewNode = document.createElement("ul");
document.getElementById(id).appendChild(oNewNode);
document.getElementById(id).active = 'true';
document.getElementById(id).loaded = 'true';
oNewNode.innerHTML="<i>"+xmlhttp.responseText+document.getElementById(id).active+"</i>";
}
}
xmlhttp.open("GET","new.php?id="+id,true);
xmlhttp.send(false);
}else{
$("#"+id).children().children().show(); document.getElementById(id).active = 'true'}}else{ $("#"+id).children().children().hide();
document.getElementById(id).active = 'false';
}return false;}
</script>
</head>
<body>
<?php
echo "<ul>";
while($taxon_name_element = mysql_fetch_array($result)){
echo "
<li id=\"{$taxon_name_element['taxonid']}\" style=\"display:block;\">{$taxon_name_element['shortname']}</li>
";}
echo "</ul></body></html>";
?>
You were missing a closing parenthesis - if popped it in with a comment where I think you were wanting it. If JS has an error it generally won't execute, and instead it'll fall back to the non JS (ie, the return false wont fire because of the error). Were you getting an actual error when running this? The console is a good friend when you're debugging JS.
Formatting your code like I have below will also help to identify any missing elements more easily.
function load_children(id)
{
if(document.getElementById(id).active != 'true')
{
if(document.getElementById(id).loaded != 'true')
{
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()
{
//actual stuff
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
//change the text
this.active='true'
//document.getElementById(id).innerHTML = xmlhttp.responseText;
var oNewNode = document.createElement("ul");
document.getElementById(id).appendChild(oNewNode);
document.getElementById(id).active = 'true';
document.getElementById(id).loaded = 'true';
oNewNode.innerHTML="<i>"+xmlhttp.responseText+document.getElementById(id).active+"</i>";
}
}
xmlhttp.open("GET","new.php?id="+id,true);
xmlhttp.send(false);
} // This was missing - were you getting an error?
}
else
{
$("#"+id).children().children().show(); document.getElementById(id).active = 'true'}
}
else
{
$("#"+id).children().children().hide();
document.getElementById(id).active = 'false';
}
return false;
}
When you're done checking and if everything is ok, take a look at: http://api.jquery.com/jQuery.get/ - the example's are at the bottom.
I have written a simple application that displays a list of candidates for a job, then, upon clicking a hire button, should alter a database to reflect the newly hired candidate and display the rest as unhired. However, the function is not working properly. The problem I am having is the AJAX function never seems to provide a response, and I cannot figure out why. The database is also not getting updated. My files are below.
The line document.getElementById("errors").innerHTML+=xmlhttp.readyState+" "+xmlhttp.status+"<br>"; is updating a div at the bottom of my html page, showing that the the readyState is 4 and the status is 200, which should mean that the AJAX function returned properly, but the echo'd response is not being displayed. Even when I remove all code from the new_hire.php file and simply make the file echo "hello";, nothing is returned in the responseText.
resumes.php:
<html>
<head>
<script type="text/javascript">
function new_hire(name){
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
document.getElementById("errors").innerHTML+=xmlhttp.readyState+" "+xmlhttp.status+"<br>";
//this line, when removed, does not change anything. I left it in for debugging purposes.
document.getElementById("errors").innerHTML+=xmlhttp.responseText;
if (xmlhttp.readyState=4 && xmlhttp.status=200){
var others = xmlhttp.responseText.split("|");
for (i=0;i<others.length;i++){
tag = others[i].replace(" ","_");
document.getElementById(tag).innerHTML="";
}
}
}
xmlhttp.open("POST","new_hire.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send("hiree="+name.replace(" ","%20")+"&position=Salespeople");
var name_tag = name.replace(" ","_");
document.getElementById(name_tag).innerHTML="(Current Employee)<br>";
}
</script>
</head>
...
</html>
new_hire.php (AJAX response file):
<?php
$hiree = $_POST['hiree'];
$pos = $_POST['position'];
$con = mysql_connect("host.name","user","pass") or die('Could not connect: ' . mysql_error());
mysql_select_db("dbname",$con);
$clear = mysql_query("UPDATE $pos SET employed=false WHERE 1=1;");
mysql_fetch_array($clear);
$reset = mysql_query("UPDATE $pos SET employed=true WHERE Name='$hiree';");
mysql_fetch_array($reset);
$people = mysql_query("SELECT Name FROM $pos WHERE employed=false;");
$array = array();
while ($row = mysql_fetch_array($people)){
array_push($array,$row['Name']);
}
mysql_close($con);
$response = join("|",$array);
echo $response;
?>
Please note that your if statement is not using the comparison operator == but rather the assignment operator = so you are using: if (xmlhttp.readyState=4 && xmlhttp.status=200) instead of if (xmlhttp.readyState==4 && xmlhttp.status==200)
i've tried using this code and this to make a random quote generator, but it doesn't display anything. my questions are:
what is wrong with my code?
in the above tut, the quote is generated on a button click, i'd like
a random quote to be displayed every
30 mins automatically. how do i do
this?
////////////////////////
quote.html:
<!DOCTYPE html>
<script src="ajax.js" type="text/javascript"></script>
<body>
<!–create the div for the quotes land–>
<div id="quote"><strong>this</strong></div>
<div><a style="cursor:pointer" onclick="run_query();">Next quote …</a></div>
</body>
</html>
/////////////////////
quote.php:
<?php
include 'config.php';
// 'text' is the name of your table that contains
// the information you want to pull from
$rowcount = mysql_query("select count(*) as rows from quotes");
// Gets the total number of items pulled from database.
while ($row = mysql_fetch_assoc($rowcount))
{
$max = $row["rows"];
}
// Selects an item's index at random
$rand = rand(1,$max)-1;
$result = mysql_query("select * from quotes limit $rand, 1");
$row = mysql_fetch_array($result);
$randomOutput = $row['storedText'];
echo '<p>' . $randomOutput . '</p>';
////////////
ajax.js:
var xmlHttp
function run_query() {
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null) {
alert ("This browser does not support HTTP Request");
return;
} // end if
var url="quote.php";
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} //end function
function stateChanged(){
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
document.getElementById("quote").innerHTML=xmlHttp.responseText;
} //end if
} //end function
function GetXmlHttpObject() {
var xmlHttp=null;
try {
// For these browsers: Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}catch (e){
//For Internet Explorer
try{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlHttp;
} //end function
Try to print the values for $max,$rand and $result. You can use print_r to get more info from the php page.
Run the quote.php on browser to see if you get an output.
Then get to ajax to debug.
You can use a timer in ajax to automate your requests for every 30 mins or so. use javascript's settimeout function for this.
HTH