I'm not sure if this is related to an ajax call or not. I'm very new to Ajax, and so I suspect it is the cause.
I run the following javascript:
function GetXmlHttpObject() {
"use strict";
var objXMLHttp = null;
if (window.XMLHttpRequest) {
objXMLHttp = new XMLHttpRequest();
} else if (window.ActiveXObject) {
objXMLHttp = new window.ActiveXObject("Microsoft.XMLHTTP");
}
return objXMLHttp;
}
function delete_director(i) {
"use strict";
var r, url;
r = window.confirm("Are you sure you want to disable this director");
url = "ajax.php?task=director&event=delete&UserId=" + i;
if (r === true) {
mdata = new GetXmlHttpObject();
if (mdata === null) {
alert("Browser does not support HTTP Request");
return;
}
mdata.open("GET", url, true);
mdata.send(null);
}
}
And that calls into the following php function:
function deletedirector()
{
$UserId=mysql_real_escape_string($_GET['UserId']);
$query = "update tbl_users set IsDisabled='1' where UserId=".$UserId;
$result = mysql_query($query) OR die('Cannot perform query!');
if ($result) {
error_log("a");
?><script type="text/javascript">window.location='index.php?task=director&success=Director Successfully Deleted.'</script><?
} else {
error_log("b");
?><script type="text/javascript">window.location='index.php?task=director&error=Director Deletion Failed.'</script><?
}
}
The db shows that the director was deleted, and "a" prints in the error log, but the window.location never fires.
The user experience is that the browser prompts for confirmation, and after that - nothing. A javascript console shows now error.
Any ideas?
You already return new object (of XMLHttpRequest API) with function, so you don't need new here
...
if (r === true) {
mdata = GetXmlHttpObject();
...
and try to use onreadystatechange like this
mdata.onreadystatechange = function(){
if (mdata.readyState === 4) {
alert("some text");
} else {
alert(mdata.status);
}
};
Related
I have 3 files, one HTML, PHP and JS. I have a button in HTML and I want to trigger the PHP file when it's clicked, through Javascript. I tried the following code, but for some reason it gives me the error message every time:
JavaScript
function getOutput() {
getRequest(
'create_json.php', // URL for the PHP file
drawOutput, // handle successful request
drawError // handle error
);
return false;
}
// handles drawing an error message
function drawError() {
var container = document.getElementById('output');
container.innerHTML = 'Bummer: there was an error!';
}
// handles the response, adds the html
function drawOutput(responseText) {
var container = document.getElementById('output');
container.innerHTML = responseText;
}
// helper function for cross-browser request object
function getRequest(url, success, error) {
var req = false;
try{
// most browsers
req = new XMLHttpRequest();
} catch (e){
// IE
try{
req = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
// try an older version
try{
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch(e) {
return false;
}
}
}
if (!req) return false;
if (typeof success != 'function') success = function () {};
if (typeof error!= 'function') error = function () {};
req.onreadystatechange = function(){
if(req.readyState == 4) {
return req.status === 200 ?
success(req.responseText) : error(req.status);
}
}
req.open("GET", url, true);
req.send(null);
return req;
}
<button id="submit" onclick="getOutput()">Submit</button>
<div id="output">waiting for action</div>
<?php
function get_data(){
$connect=mysqli_connect("localhost", "root", "root", "openingpage");
$query="SELECT * FROM created_list ";
$result=mysqli_query($connect, $query);
$list_data=array();
while($row=mysqli_fetch_array($result)){
$list_data[]=array(
'ModelID' => $row["ModelID"],
'ImageID' => $row["ImageID"],
'ListID' => $row["ListID"]
);
}
return json_encode($list_data);
}
$file_name=date('d-m-Y').'.json';
if(file_put_contents($file_name,get_data())){
echo $file_name.' file created';
}
else{
echo 'There is some error';
}
?>
I'm always getting the "Bummer: there was an error!" message. Why can't I get it . I checked the code more than 100x times but can't find whats going wrong in this code.
Thanks in advance.
Here is the code. I am fairly new to JavaScript and I'm learning more every day. This code is from an example from a textbook. Thank you for your responses. Another question I'd like to ask is how can I display the returned text in an unordered list? Would that be something to include in the html side of things or can it be done within the JavaScript file?
window.addEventListener("load",initAll,false);
var xhr = false;
function initAll() {
document.getElementById("makeTextRequest").addEventListener("click",getNewFile,false);
document.getElementById("makeXMLRequest").addEventListener("click",getNewFile,false);
}
function getNewFile(evt) {
makeRequest(this.href);
evt.preventDefault();
}
function makeRequest(url) {
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
}
else {
if (window.ActiveXObject) {
try {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) {
}
}
}
if (xhr) {
xhr.addEventListener("readystatechange",showContents,false);
xhr.open("GET", url, true);
xhr.send(null);
}
else {
document.getElementById("updateArea").innerHTML = "Sorry, but I couldn't create an XMLHttpRequest";
}
}
function showContents() {
if (xhr.readyState == 4) {
if (xhr.status == 200) {
if (xhr.responseXML && xhr.responseXML.childNodes.length > 0) {
var outMsg = getText(xhr.responseXML.getElementsByTagName("choices")[0]);
}
else {
var outMsg = xhr.responseText;
}
}
else {
var outMsg = "There was a problem with the request " + xhr.status;
}
document.getElementById("updateArea").innerHTML = outMsg;
}
function getText(inVal) {
if (inVal.textContent) {
return inVal.textContent;
}
return inVal.text;
}
}
By the looks of it, you are making an AJAX request and are receiving XML.
In this case, I would:
Open up a new page with window.open()(returns a new Window object)
And then change the document.body.innerHTML of that new page to the XML you have
If you had a webpage that held the XML(maybe the server you are requesting to has one), you can just do:
window.open("page.xml");
I want to initialize a flag in a condition in PHP and send it to be read by JavaScript.
At the moment, I have this code :
PHP
if ($totalResults > MAX_RESULT_ALL_PAGES) {
$queryUrl = AMAZON_SEARCH_URL .
$searchMonthUrlParam .
$searchYearUrlParam .
$searchTypeUrlParam .
urlencode( $keyword ) .
'&page=' . $pageNum;
} else {
$queryUrl = AMAZON_TOTAL_BOOKS_COUNT .
$searchMonthUrlParam .
$searchYearUrlParam .
$searchTypeUrlParam .
urlencode($keyword) .
"&page=" . $pageNum;
$flagQuery = TRUE;
echo $flagQuery;
}
JavaScript
<script>
function getFlagValue() {
var xmlHttp;
if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
} else {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.onreadystatechange = function() {
if (xmlHttp.readyState==4 && xmlHttp.status==200) {
alert(xmlHttp.responseText);
}
};
xmlHttp.open("GET","getAmazonResult.php",true);
xmlHttp.send();
}
var flagQuery = new Boolean();
flagQuery = getFlagValue();
alert(flagQuery);
</script>
I can't seem to retrieve the Flag in JavaScript.
I found out why my Flag displays Undefined.
It is simply that to make a alert (flagQuery) a boolean does not function.
I combine my code with that of Jan Turon, and this is achieved
function getFlagValue() {
var xmlHttp = new HmlHttpRequest();
xmlHttp.onload = function() {
if (xmlHttp.status==200) yourCustomHandler(xmlHttp.responseText);
};
xmlHttp.open("GET","getAmazonResult.php",true);
xmlHttp.send();
}
function yourCustomHandler(response) {
flagQuery = response;
alert(flagQuery);
}
flagQuery = getFlagValue();
if (flagQuery = true) {
alert ("Flag = TRUE");
}
else {
alert ("Flag = FALSE");
}
And now I see if the flag is true or false
Just uncomment the echo $flagQuery from your PHP code and change it to
echo $flagQuery ? 1 : 0;
since false echoes nothing.
A stands for asynchronous in AJAX. Therefore in your javascript you need to set the flag var in onreadystatechange event:
function getFlagValue() {
var xmlHttp = new HmlHttpRequest();
xmlHttp.onload = function() {
if (xmlHttp.status==200) yourCustomHandler(xmlHttp.responseText);
};
xmlHttp.open("GET","getAmazonResult.php",true);
xmlHttp.send();
}
function yourCustomHandler(response) {
flagQuery = response;
alert(flagQuery);
}
Your code will also work if you make it synchronous by setting false as the third parameter in:
xmlHttp.open("GET","getAmazonResult.php",false)
and if you actualy return the responseText from the getValue() function, but I don't recommend it since the net communication may fail and you javascript then freezes.
BTW: you don't need to bother with ActiveXObject legacy code, see here. Also have a look at XHR2: I updated your JS code for XHR2 standard in my answer), as you see, it is much shorter.
Oh, and there is a minor mistake in your PHP, you need to echo the flagQuery everytime:
if ($totalResults > MAX_RESULT_ALL_PAGES) {
$queryUrl = ...
$flagQuery = FALSE;
} else {
$queryUrl = ...
$flagQuery = TRUE;
}
echo $flagQuery ? 1 : 0; // outside of the if-else block
OK here is my code which i am using to call a remote site for a list of data objects which i want to display on another site.
This works fine with Chrome and Firefox but throws error in IE "Permission denied"
I also added the request for Access-Control-Allow-Origin and headers but the issue persist in IE....
I can't use jQuery because the site on which I'll put this might not have jQuery. Does it have to something with cross domain request?
<script id= "sc1" type="text/javascript">
function ajaxRequest() {
var activexmodes = ["Msxml2.XMLHTTP", "Microsoft.XMLHTTP"]
if (window.ActiveXObject) {
for (var i = 0; i < activexmodes.length; i++) {
try {
return new ActiveXObject(activexmodes[i])
} catch (e) {
}
}
} else if (window.XMLHttpRequest) return new XMLHttpRequest()
else return false;
}
var contentDiv = document.createElement("div");
contentDiv.id = 'contentJobsoid';
document.getElementById('sc1').parentNode.appendChild(contentDiv);
(function(){
var mygetrequest = new ajaxRequest()
if (mygetrequest.overrideMimeType) mygetrequest.overrideMimeType('text/html')
mygetrequest.onreadystatechange = function () {
if (mygetrequest.readyState == 4) {
if (mygetrequest.status == 200 || window.location.href.indexOf("http") == -1) {
var data = mygetrequest.responseText;
document.getElementById("contentJobsoid").innerHTML = data;
} else {
console.log("An error has occured making the request");
}
}
}
mygetrequest.open("GET", "http://www.demo.com/demo/dee0c7fe-867d-408d-a00f-d9bed4b169a7", true);
mygetrequest.send(null);
return false;
}());
</script> -->
I just passed the data from the server in form of string in the script src tag and it solved my problem very easily
I am querying a PostGIS database based on where a user clicks on a google map. I am then parsing the JSON response into a googleMaps infoWindow. This has been working great but I'd now like to query multiple urls and use those responses to fill in the infoWindow. Below is an example of the functions I've used that work great. Note: please disregard the url provided as I just made it up for this example.
var clickLoc;
function queryAct(event){
clickLoc=event.latLng;
var clickLat=clickLoc.lat();
var clickLng=clickLoc.lng();
var loUrl = 'http://www.myspatialdataset.com/sql/?q=select%20ownercateg%20from%20stew_owners%20where%20ST_Intersects%28the_geom,%20ST_GeomFromText%28%27POINT%28'+clickLng+'%20'+clickLat+'%29%27,4326%29%29';
if (window.XMLHttpRequest) { // Non-IE browsers
req = new XMLHttpRequest();
req.onreadystatechange = clickResponse;
try {
req.open("GET", loUrl, true);
} catch (e) {
alert(e);
}
req.send(null);
} else if (window.ActiveXObject) { // IE
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req) {
req.onreadystatechange = clickResponse;
req.open("GET", loUrl, true);
req.send();
}
}
}
function clickResponse(){
if (req.readyState == 4) { // Complete
if (req.status == 200) { // OK response
var clickPingBack = JSON.parse(req.responseText);
var loResponse = clickPingBack;
if (loResponse.rows.length>0)
{
var loResponseParsed=loResponse.rows[0].ownercateg;
fillWithClicked(loResponseParsed);
}
else
{
var loResponseParsed=' other';
fillWithClicked(loResponseParsed);
}
}
}
}
var infowindow = new google.maps.InfoWindow;
function fillWithClicked(loResponseParsed){
infowindow.setContent(loResponseParsed);
infowindow.setPosition(clickLoc);
infowindow.open(map);
}
How could I now do this for multiple url requests and pass those responses to the same, fillWithClicked function that fills in the infoWindow?
The code below is obviously wrong but may better explain what I am trying to do i.e. multiple URLS and filling the infoWindow with the response from two url requests. This sometimes works but is totally wrong
var clickLoc;
function distQueryAct(event){
clickLoc=event.latLng;
var clickLat=clickLoc.lat();
var clickLng=clickLoc.lng();
var distUrl = 'http://www.myspatialdataset.com/sql/?q=select%20district%20from%20mt_elk%20where%20ST_Intersects%28the_geom,%20ST_GeomFromText%28%27POINT%28'+clickLng+'%20'+clickLat+'%29%27,4326%29%29';
if (window.XMLHttpRequest) { // Non-IE browsers
distReq = new XMLHttpRequest();
distReq.onreadystatechange = loQueryAct(clickLoc);
try {
distReq.open("GET", distUrl, true);
} catch (e) {
alert(e);
}
distReq.send(null);
} else if (window.ActiveXObject) { // IE
distReq = new ActiveXObject("Microsoft.XMLHTTP");
if (distReq) {
distReq.onreadystatechange = loQueryAct(clickLoc);
distReq.open("GET", distUrl, true);
distReq.send();
}
}
}
function loQueryAct(clickLoc){
var clickLat=clickLoc.lat();
var clickLng=clickLoc.lng();
var loUrl = 'http://www.myspatialdataset.com/sql/?q=select%20ownercateg%20from%20stew_owners%20where%20ST_Intersects%28the_geom,%20ST_GeomFromText%28%27POINT%28'+clickLng+'%20'+clickLat+'%29%27,4326%29%29';
if (window.XMLHttpRequest) { // Non-IE browsers
loReq = new XMLHttpRequest();
loReq.onreadystatechange = distClickResponse;
try {
loReq.open("GET", loUrl, true);
} catch (e) {
alert(e);
}
loReq.send(null);
} else if (window.ActiveXObject) { // IE
loReq = new ActiveXObject("Microsoft.XMLHTTP");
if (loReq) {
loReq.onreadystatechange = distClickResponse;
loReq.open("GET", loUrl, true);
loReq.send();
}
}
}
function distClickResponse(){
if (distReq.readyState == 4 && loReq.readyState == 4) { // Complete
if (distReq.status == 200 && loReq.status == 200) { // OK response
var distPingBack = JSON.parse(distReq.responseText);
var distResponse = distPingBack;
var loPingBack = JSON.parse(loReq.responseText);
var loResponse = loPingBack;
if (distResponse.rows.length>0)
{
var distResponseParsed=distResponse.rows[0].district;
}
else
{
var distResponseParsed=' other';
}
if (loResponse.rows.length>0)
{
var loResponseParsed=loResponse.rows[0].ownercateg;
}
else
{
var loResponseParsed=' other';
}
}
distFillWithClicked(loResponseParsed,distResponseParsed);
}
}
var infowindow = new google.maps.InfoWindow;
function distFillWithClicked(distResponseParsed,loResponseParsed){
infowindow.setContent(distResponseParsed+loResponseParsed);
infowindow.setPosition(clickLoc);
infowindow.open(map);
}
I figured it out. Using getJSON instead of XMLHttpRequest was the key. I know this could be cleaner but it does work.
var clickLoc;
function queryAct(event){
clickLoc=event.latLng;
var clickLat=clickLoc.lat();
var clickLng=clickLoc.lng();
var toFillArray=Array();
var loUrl='http://www.mypostgis.com/sql/?q=select%20ownercateg%20from%20stew_owners%20where%20ST_Intersects%28the_geom,%20ST_GeomFromText%28%27POINT%28'+clickLng+'%20'+clickLat+'%29%27,4326%29%29';
var distUrl='http://www.mypostgis.com/sql/?q=select%20district%20from%20mt_elk%20where%20ST_Intersects%28the_geom,%20ST_GeomFromText%28%27POINT%28'+clickLng+'%20'+clickLat+'%29%27,4326%29%29';
$.getJSON(loUrl,function(tmpLoDat){
if (tmpLoDat.rows.length>0)
{
var tempCat=tmpLoDat.rows[0].ownercateg;
toFillArray.push(tempCat);
}
else
{
var tempCat='other';
toFillArray.push(tempCat);
}
otherFunction(toFillArray,distUrl);
})
}
function otherFunction(toFillArray,distUrl){
$.getJSON(distUrl,function(tmpDistDat){
if (tmpDistDat.rows.length>0)
{
var tempDist=tmpDistDat.rows[0].district;
toFillArray.push(tempDist);
}
else
{
var tempDist='Other';
toFillArray.push(tempDist);
}
fillWithClicked(toFillArray);
})
}
var infowindow = new google.maps.InfoWindow;
function fillWithClicked(toFillArray){
infowindow.setContent(toFillArray[0]+toFillArray[1]);
infowindow.setPosition(clickLoc);
infowindow.open(map);
}
If you want the data to grow your element, let's try something like that :
function fillWithClicked(loResponseParsed){
document.getElementById("regulations").innerHTML += loResponseParsed;
}
If the calls of your function are not in the same page, you'll need to use a cache file and a user_id (session id, cookie id or IP adress...):
// js & jquery for example
function fillWithClicked(loResponseParsed,user_id)
{
$.post('cachecreate.php',{content:loResponseParsed,user_id:user_id},
function()
{
$.get('cachefile_'+user_id+'.html',
function(data)
{
document.getElementById("regulations").innerHTML=data;
});
});
}
// cachecreate.php for example
<?php
$cache = "cachefile_".$_POST['user_id'].".html";
ob_start();
if(file_exists($cache))
{
include($cache);//or readfile(); i forgot...
echo "<hr/>".$_POST['content'];// Strip <hr/> for JSON
}
else
{
echo $_POST['content'];
}
$page_content=ob_get_contents();// if JSON needed : json_encode($page_content);
ob_end_clean();
file_put_contents($cache, $page_content);// PHP 5+ function
?>
I hope that it may help you, or bring you to the solution.
EDIT regarding your new details
Try something like this (I lighten your code...).
With this you can add as multiple urls as you want.
var clickLoc;
function queryAct(event)
{
clickLoc=event.latLng;
var clickLat=clickLoc.lat();
var clickLng=clickLoc.lng();
var url=Array();
var data=null;
url['loUrl'] ="url1";
url['distUrl'] ="url2";
url['otherUrl'] ="urlx";
for(page in url)
{
data+=getJSON(page);
}
fillWithClicked(data);
}
function getJSON(url)
{
if (window.XMLHttpRequest)
{req = new XMLHttpRequest();}// Non-IE
else if (window.ActiveXObject)
{req = new ActiveXObject("Microsoft.XMLHTTP");}// IE
if(req)
{
req.open("GET", url, true);
req.send(null);
req.onreadystatechange = function() {
if(req.readyState == 4)
{
if (req.status == 200)
{ // OK response
var clickPingBack = JSON.parse(req.responseText);
var loResponse = clickPingBack;
if (loResponse.rows.length>0)
{
var loResponseParsed=loResponse.rows[0].ownercateg;
}
else
{
var loResponseParsed=' other';
}
return loResponseParsed;
}
}
}
}
}
var infowindow = new google.maps.InfoWindow;
function fillWithClicked(loResponseParsed)
{
infowindow.setContent(loResponseParsed);
infowindow.setPosition(clickLoc);
infowindow.open(map);
}
EDIT -> External domain files
httpRequest doesn't work with files in another domain.
You can use one of those solutions, I may use the second for me.
PHP Solution
// In your js file, change the urls like this
url['url_x'] ='myphppage.php?url=url_x_to_parse';
// myphpage.php script that displays the content of the external file
<?php
if(isset($_GET['url'])) {
header("Content-type: text/json");
echo file_get_contents(urldecode($_GET['url']));
}
?>
JQUERY solution (better one)
// change the name of getJSON function cause jquery uses the same name...
function getURLcontent(url)
{
$.get(url,function(data){
var clickPingBack = JSON.parse(data.responseText);
var loResponse = clickPingBack;
loResponse=data;
if (loResponse.rows.length>0)
{
var loResponseParsed=loResponse.rows[0].ownercateg;
}
else
{
var loResponseParsed=' other';
}
return loResponseParsed;
});
}
download jquery library http://code.jquery.com/jquery-1.7.1.min.js
include jquery plugin in the head of your page with <script src="jquery-1.7.1.min.js"></script>