Develop Reference

Check if $.ajax has already been sent and if so then retrieve data without resending

I have this ajax request that is sent from javascript in my page
$.ajax({
url: "/get.php",
data:{id:ids},
type: 'GET',
async: false,
success: function(data) {
alert(data);
}
});
This returns an array of items with some text and ...
Now if the user clicks on a certain button the data needs to be copied to another place on the page(div)
Is there any way I can get the data again from the file (in the network tab "chrome") without resending the request?

Put the response in global variable (dataArray) and every time check that variable has value or not. So that request will not send further time. Also, you can use that global variable (dataArray) in other methods.
var dataArray = "";
function getData(){
if(dataArray != ""){
$.ajax({
url: "/get.php",
data:{id:ids},
type: 'GET',
//async: false,
success: function(data) {
//alert(data);
dataArray = data;
}
});
}
}

Merging Javascript AJAX requests

I have a performance problem when loading a website over the network stored on an internal server. The performance issue is down to the multiple AJAX requests made in my Javascript file constantly trying to access an XML file and then getting an Image from a XML node or a Name from an XML node.
Is there a way I can merge the AJAX requests together to reduce the amount of requests from the client device to the XML file stored on the server.
My code is as below:
function getimage(getID,XMLImageID)
{
$("#" + getID).empty();
$.ajax({
type: "GET",
url: "XML/XML.xml",
dataType: "xml",
success: function(xml){
$(xml).find(XMLImageID).each(function(){
var image = $(this).find("image[href]").attr("href");
$('#'+ getID).append($("<img"+" class="+"Timages"+" src=\"" +image+"\"/>"));
});
},
error: function() {
alert("(getImage) An error occurred while processing XML file. Reasons could be: \n The XML cant be located. \n The XML is being used by another program. \n The XML is trying to parse incompatible characters. \n The XML syntax/tags are incorrect.");
}
});
}
function getdept(getid,XMLID)
{
var scriptTag = document.scripts[document.scripts.length - 1];
var parentTag = scriptTag.parentNode;
getid = parentTag.id;
$.ajax({
type: "GET",
url: "XML/XML.xml",
dataType: "xml",
success: function(xml){
$(xml).find(XMLID).each(function(){
var dept = $(this).find('Dept').text();
var id = $(this).attr("id");
var sName = $(this).find('Name').text();
$("#"+getid).append('<div class="Team_People" onmouseover="area_hover1(this);area_hover2(this)" href="#p'+id+'">'+dept+'<br />'+sName+'</div>');
});
},
error: function() {
alert("(getHierPeopleDept)An error occurred while processing XML file. Reasons could be: \n The XML cant be located. \n The XML is being used by another program. \n The XML is trying to parse incompatible characters. \n The XML syntax/tags are incorrect.");
}
});
}
The AJAX response uses a simplified code below, I just need to merge the code above to make it more neater rather than having multiple ajax requests. Not sure if this is possible (whether adding multiple parameters would work)?
$.ajax({
type: "GET",
url: "XML/XML.xml",
dataType: "xml",
success: function(xml){
$(xml).find(XMLID).each(function(){
//Get something from XML node
});
},
});
}
If anyone could guide me in the right direction that would be much appreciated!
Thanks
Regards
AJ

Create a global XML variable and query that with your function calls...
var XML = null;
function fetchXML(){
$.ajax({
type: "GET",
url: "XML/XML.xml",
dataType: "xml",
success: function(data){
XML = data;
},
error:function(){ alert('something went wrong');})
}
function getImage(id) {
$(XML).find(id).each(){ ... };
}
funcition getDept(id) {
$(XML).find(id).each(){ ... };
}

jquery $.ajax automatically evaluates javascript file

I have a file list, when the user double clicks a file, it is displayed in an editor,
The problem is, after opening a javascript file, all bootstrap functions get undefined.
UPDATE:
function openFile(file){
var filename = file.getPath();
$.ajax({
url: "${fileStorageServiceBaseUrl}" + applicationId + "/files/"+ resType + filename,
type: "GET",
success: function(response) {
editor.setFile(filename, response);
}
});
openResType = resType;
$("#saveButton").prop("disabled",false);
}
After calling this function, bootstrap functions get undefined. I'm calling it from the console, not via events now.

function openFile(file){
var filename = file.getPath();
$.ajax({
url: "${fileStorageServiceBaseUrl}" + applicationId + "/files/"+ resType + filename,
type: "GET",
dataType: "text", // THIS LINE SOLVED IT!
success: function(response) {
editor.setFile(filename, response);
}
});
openResType = resType;
$("#saveButton").prop("disabled",false);
}
From the jquery documentation:
dataType: (default: Intelligent? Guess (xml, json, script, or html)) Type: String.
The type of data that you're expecting back from the server.
"script" (this was getting selected by default): Evaluates the response as JavaScript and returns it as plain text.

How to read XML file in Javascript (or jQuery)

I'm working on getting info for an artist from last.fm servers and I need to be able to read the picture of the artist they have on their servers. You can view an example XML return statement here. As you can see, there are many images for each artist (small, medium, large, extralarge, and mega). I need to be able to ready any of these and get the appropriate value back.
I'm new to reading XML/DOM through Javascript, so I'm sure it's fairly simple, but the extra attribute of "size" in the XML file is throwing me for a bit of a loop. Thanks!

This gets the first image for example.
$.ajax({
url: "http://ws.audioscrobbler.com/2.0/?method=artist.getinfo&artist=Cher&api_key=ac74a1e6fae52bc5f55a8a6f30b84db9",
type: "GET",
dataType: "html",
success: function(data) {
var xml = $.parseXML(data)
$(xml).each(function()
{
alert($(this).find("lfm>artist>image[size]:first").text());
});
},
error: function(jqXHR, textStatus, errorThrown ){
// debug here
alert("failure");
}
});
}

use $.parseXML to create a kind of x-document.. then you can find stuff from it with jquery selectors.
getXMLNode(retObj.responseXML, "thatField");
function getXMLNode(xml, nameOfField) {
return $($.parseXML(xml)).find(':first').find(nameOfField).text();
}

Something to this effect should return all image sizes:
$.ajax({
type: "GET",
url: "http://ws.audioscrobbler.com/2.0/?method=artist.getinfo&artist=Cher&api_key=ac74a1e6fae52bc5f55a8a6f30b84db9",
dataType: "xml",
success: function (xml) {
// Parse the xml file and get data
var xmlDoc = $.parseXML(xml),
$xml = $(xmlDoc);
$xml.find('image').each(function () {
console.log($(this).text())
});
}
});

Access Javascript variable in php in same page

Hi I am facing problem with json data. Here is my js code.
<script>
$(function(){
$.ajax({
url:"http://example.com/salary?from=USD&to=GBP",
dataType: 'jsonp',
success:function(json){
alert(json['to']);
},
error:function(){
alert("Error");
},
});
});
</script>
I want to use json data in PHP in same page.
I know that you cannot assign Javascript value to PHP variable.
Is there way to do this?
Or is possible to do similar task in php (Jquery Ajax cross domain) like above javascript code ?
Any help?

your js code
var my_json_obj = new Object();
my_json_obj .name = "Lanny";
my_json_obj .age = "25";
my_json_obj .location = "China";
var json_str = JSON.stringify(my_json_obj);
<script>
$(function(){
$.ajax({
type: "POST",
dataType: "json",
url: "my.php",
data: {
postData: json_str
},
success: function (data) { alert(data) },
eror: function (data) { alert(data) }
});
});
</script>
your my.php file
$postData=$_POST['postData'];
$my_obj=json_decode($postData,true);
$name=$my_obj['name'];
$age=$my_obj['age'];
$localtion=$my_obj['location'];

You could do that with AJAX.
You need a script, which will give javascript vars to the PHP Script, like:
var PHPFile = 'PHPFile.php?arg1=' + arg1 + '&arg2=' + arg2;
In the "PHPFile.php" you can access them by
$arg1 = $_GET["arg1"];
$arg2 = $_GET["arg2"];
Or you could do that with jquery $.ajax-> data, too.
You can access them by
$arg1 = $_POST["arg1"];
$arg2 = $_POST["arg2"];
Something like that:
result = $.ajax({
type: 'POST',
async: false,
url: 'PHPFile.php',
data: ({
arg1: arg1,
arg2: arg2
})
}).responseText;
alert(result);
EDIT:
If you want to do that with a json-object, try this:
json_decode();
http://www.php.net/manual/en/function.json-decode.php
http://www.php.net/manual/en/function.json-encode.php