Develop Reference

Javascript get JSON value from URL error

im using the function below to get image names. I also use the json code to get data of a different url, but somehow it isnt working at this. (im new to javascript. Just writing php normally.
function getImgname(name) {
$.getJSON("http://url.com/info.php?name="+name, function(json321) {
return json321.js_skininfo;
});
}

Try this:
function getImgname(myName) {
$.ajax({
url: 'http://url.com/info.php',
data: {
name: myName
},
type: 'POST',
dataType: 'json',
success: function(data) {
// do what you want with your data
return data.js_skininfo;
}
});
}

I tried this now:
function getImgname(myName) {
$.ajax({
url: "http://url.com/ninfo.php",
type: 'POST',
dataType: 'json',
success: function (data) {
return data.js_skininfo;
},
error: function () {
}
});
}
This isnt working (undefinied), but if i alert the data.js_skininfo it shows me the correct value.

Web service receiving null with jQuery post JSON

The web service on http://localhost:57501/api/addDatabase has the following code.
[System.Web.Mvc.HttpPost]
public ActionResult Post(addDatabase pNuevaConeccion)
{
pNuevaConeccion.insertarMetaData();
return null;
}
The Ajax function is on a javascript that creates the JSON from the give values on http://localhost:1161/CreateServer.
$(document).ready(function ()
{
$("#createServer").click(function (e) {
e.preventDefault(); //Prevent the normal submission action
var frm = $("#CreateServerID");
var dataa = JSON.stringify(frm.serializeJSON());
console.log(dataa);
$.ajax({
type: 'POST',
url: 'http://localhost:57501/api/addDatabase/',
contentType: 'application/json; charset=utf-8',
crossDomain: true,
//ContentLength: dataa.length,
data: dataa,
datatype: 'json',
error: function (response)
{
alert(response.responseText);
},
success: function (response)
{
alert(response);
if (response == "Database successfully connected") {
var pagina = "/CreateServer"
location.href = pagina
}
}
});
});
});
When I run this code an alert pops up saying "undefined" but if I delete the contentType the alert doesn't show up. The problem is that the variables that the function Post (from the web service) receives are NULL even though I know that the JSON named dataa is not NULL since I did a console.log.
I have seen various examples and pretty much all of them say that I should use a relative URL but the problem is that since there are 2 different domains and when I tried it, it couldn't find the URL since it's not in the same localhost.

Web service should return a JSON format instead of null. like below example.
public JsonResult Post()
{
string output = pNuevaConeccion.insertarMetaData();
return Json(output, JsonRequestBehavior.AllowGet);
}

try to use this code for calling the web method
$.ajax({
method: "POST",
contentType: "application/json; charset=utf-8",
data: dataa,
url: 'http://localhost:57501/api/addDatabase/',
success: function (data) {
console.log(data);
},
error: function (error) {
console.log(error);
}
});

its my old code.(ensure action parameter variable name and post variable name are same)
$('#ConnectionAddres_ZonesId').change(function () {
var optionSelected = $(this).find("option:selected");
var id = { id: optionSelected.val() };
$.ajax({
type: "POST",
url: '#Url.Action("GetParetArea", "Customers")',
contentType: "application/json;charset=utf-8",
data: JSON.stringify(id),
dataType: "json",
success: function (data) {
$('#ConnectionAddres_ParentAreaId').empty().append('<option value="">Select parent area</option>');
$.each(data, function (index, value) {
$('#ConnectionAddres_ParentAreaId').append($('<option />', {
value: value.Id,
text: value.Area
}));
});
},
});
});
public ActionResult GetParetArea(int id)
{
var parents="";
return Json(parents, JsonRequestBehavior.AllowGet);
}

how to pass a additional data with form serialized data on ajax?

How to pass an additional data with form serialize data on ajax post method?.
below is my code which was using for ajax post,
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frm.serialize(),
success: function (data) {
alert(data);
}
});
});
here, how to pass a additional_data with serialize form data

From jQuery API DOCS
The .serializeArray() method creates a JavaScript array of objects
The .serialize() method creates a text string in standard URL-encoded notation.
I think to use push , we need to use serializeArray
try to use
var frmData = frm.serializeArray();
frmData.push({name: "name", value: "test"});
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frmData,
success: function (data) {
alert(data);
}
});
});

You need to push the elements to the existing serialized data.
var frmData = frm.serialize();
frmData.push({name: nameofthevariable, value: valueofthevariable});
frmData.push({name: nameofthevariable2, value: valueofthevariable2});
frmData.push({name: nameofthevariable3, value: valueofthevariable3});
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frmData,
success: function (data) {
alert(data);
}
});
});

serialize() create a query string of the form. So you can append additional parameters into it.
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frm.serialize()+'&param1='+value1+'&param2='+value2,
success: function (data) {
alert(data);
}
});
});

serializearray() can be used to send additional parameters. PFB code for sending additional parameters.
var request = $('form').serializeArray();
request.push({name: "kindOf", value: "save"});
Ajax call
$.ajax({
url: "/ST/SubmitRequest",
dataType: "json",
//contentType: "application/json",
type: "POST",
data: request,
//data: r1,
success: function (response) {
//Setinterval();
//alert("Done...!");
},
failure: function (response) {
alert(response.responseText);
},
error: function (response) {
alert(response.responseText);
}
});

why does returning the jquery AJAX promise in this function fail to give me the data?

This AJAX works on jsfiddle
var a = $.ajax({
url: "/echo/json/",
type: "post",
data: {
json: JSON.stringify({
a: true
})
},
dataType: "json"
});
a.done(function (data) {
console.log(data);
});
Why won't it work when I make a the function and return the AJAX promise?
var a = function () {
return $.ajax({
url: "/echo/json/",
type: "post",
data: {
json: JSON.stringify({
a: true
})
},
dataType: "json"
});
}
a.done(function (data) {
console.log(data);
});
Is this not the correct syntax? Well, apparently not, but how can I build the AJAX request into the function? FIDDLE

Since a is a function, you have to call it:
a().done(function(data) {
console.log(data);
});

Going reusable with data attributes and jquery

I have many Bootstrap Type-ahead attached to my text-box.
I was using there id to select then and attach typeahead.
Sample
$("#SireTag").typeahead({
source: function (query, process) {
$.ajax({
url: '/Bull/GetSireTag',
type: 'POST',
data: 'query=' + query,
dataType: 'JSON',
async: true,
success: function (data) {
console.log(data);
process(data);
}
});
}
});
Now i decided to make it more readable and short by using a single java-script code to attach type ahead to all my text-boxes.
<input data-typeahead-url="/Bull/GetSireTag" id="SireTag" name="SireTag" type="text" value="">
New Javascript
$('*[data-typeahead-url]')
.each(function () {
alert(this);
$(this).typeahead({
source: function (query, process) {
$.ajax({
url: $(this).data("typeahead-url"),
type: 'POST',
data: 'query=' + query,
dataType: 'JSON',
async: true,
success: function (data) {
console.log(data);
process(data);
}
})
}
});
});
But its not working i am not so proficient with java-script anyone now whats wrong.
I tried developers tool ajax request is not made.

$('*[data-autocomplete-url]') doesn't select your elements because you're using data-typeahead-url.

You need to return the ajax result to the source, also don't use alert() to debug, use console.log() instead:
$('input[data-typeahead-url]').each(function () {
$(this).typeahead({
source: function (query, process) {
return $.ajax({
url: $(this).data("typeahead-url"),
type: 'POST',
data: { query: query },
dataType: 'json',
async: true,
success: function (resp) {
console.log(resp);
return process(resp);
}
});
}
});
});
Hope it helps.

$('*[data-typeahead-url]')
.each(function () {
var url = $(this).data("typeahead-url");
$(this).typeahead({
source: function (query, process) {
$.ajax({
url: url,
type: 'POST',
data: 'query=' + query,
dataType: 'JSON',
async: true,
success: function (data) {
console.log(data);
process(data);
}
})
}
});
});
Problem: The code was making ajax request but to the same address.
Diagnose: I tried log($(this).data("typeahead-url");) which gave desired output.
Solution: I created and stored the Url the used it as a parameter in ajax call
var url = $(this).data("typeahead-url");
Hope this help.