If I have the following ajax call (inside a function) how do I go about returning the 'test' variable, in this case a string for testing purposes? Currently i'm getting test is not defined.
function getMaps(){
mapID = "us";
$.ajax({
type: "GET",
url: "getMap.asp",
data: "mapID=" + mapID,
contentType: "application/json; charset=utf-8",
dataType: "json",
async: false,
success: function(response) {
var test = 'text string';
}
});
return test;
};
function getMaps(){
mapID = "us";
var test="";
$.ajax({
type: "GET",
url: "getMap.asp",
data: "mapID=" + mapID,
contentType: "application/json; charset=utf-8",
dataType: "json",
async: false,
success: function(response) {
test = 'text string';
}
});
return test;
};
Try to open a pop-up box or set the value of some text field instead. The response function you defined will get called asynchronously.
Also, "test" is not defined within the scope of the function from which it is returned. Move the definition to the top of that function -- it shouldn't be undefined, but it will still not solve the issue.
var right before test means that the variable will be visible only inside that anonymous function
Related
This AJAX call is returning "undefined". I'm not sure what I'm doing wrong and why this isn't working:
var xmlfile;
$.ajax({
type: 'GET',
url: 'sample.xml',
dataType: 'xml',
success: function(data){
xmlfile = $(data);}
});
console.log(xmlfile);
This is likely to be a timing issue since you're referring to the xmlFile variable before the call returns. Instead you have to move the reference into the success callback.
$.ajax({
type: 'GET',
url: 'sample.xml',
dataType: 'xml',
success: function(data){
xmlfile = data;
console.log(xmlfile);
}
});
Try the above.
you can do this by
$.ajax({
type: 'GET',
url: 'sample.xml',
dataType: 'xml',
success: function(data){
xmlfile = data ;}
});
or set the async : false,
you can detect error/problem by debugging so you can see where are you doing wrong
like see alert(data) it it does it mean you are getting successful response by ajax call
var xmlfile;
$.ajax({
type: 'GET',
url: 'sample.xml',
dataType: 'xml',
async : false,
success: function(data){
xmlfile = $(data);}
});
console.log(xmlfile);
try This, you are getting undefined due to asyn call, your log executes before you got result from server
Hello guys i have the next ajax call for login. I serialize the form and send the data to server and return redirect url link. My problem is that my url after post is like
http://localhost:50802/?username=&password= and not http://localhost:50802/Home
$.ajax({
type: "POST",
url: "Login/Login",
dataType: 'json',
contentType: "application/json; charset=utf-8",
data: loginJson,
cache: true,
async: false,
complete: function (result) {
alert(result.link);
window.location.replace = "/Home/Index";
},
error: function () {
$("#username").val("");
$("#password").val("");
alert("Wrong Username or Password!");
}
}); //end ajax call
It looks like you wrote this $.ajax call in the .click event of a submit button or in the .submit event of a form without canceling the default action by returning false from the callback or by calling preventDefault on the argument. Here's how your code should look like:
$('#id_of_your_form').submit(function(e) {
e.preventdefault(); // <-- That's what I am talking about and what you forgot
$.ajax({
type: "POST",
url: "Login/Login",
dataType: 'json',
contentType: "application/json; charset=utf-8",
data: loginJson,
cache: true,
async: false,
complete: function (result) {
window.location.replace = "/Home/Index";
},
error: function () {
$("#username").val("");
$("#password").val("");
alert("Wrong Username or Password!");
}
}); //end ajax call
});
Also async: false,????? You know what this does, do you? That's not AJAX. That's a blocking synchronous call to your webserver during which the client browser would be frozen like during the Ice Age 2 ruining all user experience.
Try returning false at the end of your submit function
$('#id_of_your_form').submit(function(e) {
$.ajax({
type: "POST",
url: "Login/Login",
dataType: 'json',
contentType: "application/json; charset=utf-8",
data: loginJson,
cache: true,
async: false,
complete: function (result) {
window.location = "/Home/Index";
},
error: function () {
$("#username").val("");
$("#password").val("");
alert("Wrong Username or Password!");
}
}); //end ajax call
return false; });
Another option would of course be to return the correct redirectlink from the controller instead of overriding it in the java script.
I am trying to use the newer .done() syntax for a call to .ajax(), but I don't see how to get the data returned from the server into my .done() function. Here is my code:
function checkLink(element) {
var resultImg = $(element).parent().parent().find("img");
resultImg.attr("src", "/resources/img/ajaxLoad.gif");
$.ajax({
type: 'POST',
url: '/services/Check.asmx/CheckThis',
data: '{somedata: \'' + whatever + '\'}',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: onSuccess,
error: onFailure
}).done(function () { success2(resultImg); });
}
function success2(img) {
img.attr('src', '/resources/img/buttons/check.gif');
}
function onSuccess(data) {
// The response from the function is in the attribute d
if (!data.d) {
alert('failed');
}
else {
alert('hurray!');
}
}
checkLink is called from a simple button push. Both onSuccess() and success2() are firing just fine. But... what I need is the "data" parameter from onSuccess passed to success2... or alternately, be able to pass "resultImg" to onSuccess (although I would prefer using .done instead of the deprecated method). It seems I can either pass my own parameters, or access the JSON result from the AJAX call... but not both. How do I accomplish this?
You can close over the resultImg variable:
function checkLink(element) {
var resultImg = $(element).parent().parent().find("img");
resultImg.attr("src", "/resources/img/ajaxLoad.gif");
$.ajax({
type: 'POST',
url: '/services/Check.asmx/CheckThis',
data: '{somedata: \'' + whatever + '\'}',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: onSuccess,
error: onFailure
}).done(success2);
function success2(data) {
resultImg.attr('src', '/resources/img/buttons/check.gif');
// do whatever with data
}
function onSuccess(data) {
// The response from the function is in the attribute d
if (!data.d) {
alert('failed');
}
else {
alert('hurray!');
}
}
}
This works fine:
jQuery('#my_get_related_keywords').click(function() {
if (jQuery('#my_keyword').val() == '') return false;
jQuery.getJSON("http://boss.yahooapis.com/ysearch/web/v1/"
+jQuery('#my_keyword').val()+"?"
+"appid=myAppID"
+"&lang=en"
+"&format=json"
+"&count=50"
+"&view=keyterms"
+"&callback=?",
function (data) {//do something}
This returns 400 Bad Request (Just a reformulation of the above jQuery using .ajax to support error handling).
jQuery('#my_get_related_keywords').click(function()
{
if (jQuery('#my_keyword').val() == '') return false;
jQuery('#my_loader').show();
jQuery.ajax(
{
url: "http://boss.yahooapis.com/ysearch/web/v1/"
+jQuery('#my_keyword').val()+"?"
+"appid=myAppID"
+"&lang=en"
+"&format=json"
+"&count=50"
+"&view=keyterms"
+"&callback=?",
success: function(data)
{//do something}
I think you just need to add 2 more options (contentType and dataType):
$('#my_get_related_keywords').click(function() {
$.ajax({
type: "POST",
url: "HERE PUT THE PATH OF YOUR SERVICE OR PAGE",
data: '{"HERE YOU CAN PUT DATA TO PASS AT THE SERVICE"}',
contentType: "application/json; charset=utf-8", // this
dataType: "json", // and this
success: function (msg) {
//do something
},
error: function (errormessage) {
//do something else
}
});
}
Add this to your ajax call:
contentType: "application/json; charset=utf-8",
dataType: "json"
Late answer, but I figured it's worth keeping this updated. Expanding on Andrea Turri answer to reflect updated jQuery API and .success/.error deprecated methods.
As of jQuery 1.8.* the preferred way of doing this is to use .done() and .fail(). Jquery Docs
e.g.
$('#my_get_related_keywords').click(function() {
var ajaxRequest = $.ajax({
type: "POST",
url: "HERE PUT THE PATH OF YOUR SERVICE OR PAGE",
data: '{"HERE YOU CAN PUT DATA TO PASS AT THE SERVICE"}',
contentType: "application/json; charset=utf-8",
dataType: "json"});
//When the request successfully finished, execute passed in function
ajaxRequest.done(function(msg){
//do something
});
//When the request failed, execute the passed in function
ajaxRequest.fail(function(jqXHR, status){
//do something else
});
});
Be sure and use 'get' or 'post' consistantly with your $.ajax call for example.
$.ajax({
type: 'get',
must be met with
app.get('/', function(req, res) {
===============
and for post
$.ajax({
type: 'post',
must be met with
app.post('/', function(req, res) {
I was getting the 400 Bad Request error, even after setting:
contentType: "application/json",
dataType: "json"
The issue was with the type of a property passed in the json object, for the data property in the ajax request object.
To figure out the issue, I added an error handler and then logged the error to the console. Console log will clearly show validation errors for the properties if any.
This was my initial code:
var data = {
"TestId": testId,
"PlayerId": parseInt(playerId),
"Result": result
};
var url = document.location.protocol + "//" + document.location.host + "/api/tests"
$.ajax({
url: url,
method: "POST",
contentType: "application/json",
data: JSON.stringify(data), // issue with a property type in the data object
dataType: "json",
error: function (e) {
console.log(e); // logging the error object to console
},
success: function () {
console.log('Success saving test result');
}
});
Now after making the request, I checked the console tab in the browser development tool.
It looked like this:
responseJSON.errors[0] clearly shows a validation error: The JSON value could not be converted to System.String. Path: $.TestId, which means I have to convert TestId to a string in the data object, before making the request.
Changing the data object creation like below fixed the issue for me:
var data = {
"TestId": String(testId), //converting testId to a string
"PlayerId": parseInt(playerId),
"Result": result
};
I assume other possible errors could also be identified by logging and inspecting the error object.
Your AJAX call is not completed with the following two params.
contentType: "application/json; charset=utf-8",
dataType: "json"
contentType is the type of data you're sending
dataType is what you're expecting back from the server
In addition try to use JSON.stringify() method. It is used to turn a javascript object into json string.
In my web page there is a textbox to get the scanned barcode value. Once we scan the barcode it has to get details from the database. I am creating the change event for the textbox.
Problem: $.ajax is not working.
Code:
var target = $('#txtBarcode'), val = target.val();
target.change(monitor());
function monitor() {
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
data: "{}",
url: "HomePage.aspx/SearchProduct",
dataType: "json",
success: function(data) {
alert("Success!!!");
}
});
}
You are trying to pass 'monitor' to the change method but you're actually calling it. It should look like this (no parens)
var target = $('#txtBarcode'), val = target.val();
target.change(monitor);
function monitor() {
You can always declare it inline too:
var target = $('#txtBarcode'), val = target.val();
target.change(
function() {
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
data: "{}",
url: "HomePage.aspx/SearchProduct",
dataType: "json",
success: function(data) {
alert("Success!!!");
}
});
});
Add an error handler.
Make sure your relative URL is right.
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
data: "{}",
url: "HomePage.aspx/SearchProduct",
dataType: "json",
success: function(data) {
alert("Success!!!");
},
error: function(XMLHttpRequest, textStatus, errorThrown)
{
// ...
}
});
EDIT: Dan is right about your change handler.
You can copy some answers posted here, and at least one of will likely to work, but you won't get the intimate knowledge of why. Here's an additional way:
Since you use asp.net, put the break point in the first line of HomePage.aspx/SearchProduct. This ensure that the request goes to the right URL on the server.
Step all the way through this method to make sure there's no exception that gets thrown.
Use FireFox and install Firebug (even if you target IE and have no intention to make it run on FF). You can inspect the http response.
Add an error handler in addition to the success handler.