I am using Yahoo BOSS and Bing APIs to provide search functionality to my site. Specificaly, I use their JSON response formats where I would pass a callback function to the search provider that would later be called back with the search results. My callback function actually gets called, but the problem is, if I make more than one requests at a time, I can't tell which request a certain response is for. To this end, is there a way to pass additional parameters with the callback function to the search provider so that I can later use it to identify which response goes with which request?
Thank you
I have a same problem with you! I googled and find some solutions
and I has solve my problem. Now i show it to you, I hope it can help you :)
Previous code:
function MakeGeocodeRequest(credentials) {
var pins = checkLocation.d
$.each(pins, function (index, pin) {
var geocodeRequest = 'http://ecn.dev.virtualearth.net/REST/v1/Locations/' + pin.City + ',' + pin.Country + '?output=json&jsonp=GeocodeCallback&key=' + credentials;
CallRestService(geocodeRequest);
});
function CallRestService(request) {
var script = document.createElement("script");
script.setAttribute("type", "text/javascript");
script.setAttribute("src", request);
document.body.appendChild(script);
}
function GeocodeCallback(result) {.. to do with result callback, --> i want to add some pin infomation here}
Because each sccipt when add to document ( document.body.appendChild(script);) it will be run --> and callback, you cant add more params.
I solve it by request through ajax (doesnt add to document any more), when the ajax call success --> I call the GeocodeCallback(result, pin)
Here is the complete code.
function MakeGeocodeRequest(credentials) {
var pins = checkLocation.d;
$.each(pins, function (index, pin) {
$.ajax({
url:"http://ecn.dev.virtualearth.net/REST/v1/Locations/",
dataType: "jsonp",
data:{key:credentials,q:pin.City + ',' + pin.Country},
jsonp:"jsonp",
success: function(result){
GeocodeCallback(result,pin);
}
});
});
}
function GeocodeCallback(result,pin) { ... to do here}
Related
I have a webapi project where I'm returning a list of products and I have an ajax call on my another project.
When I use ajax call on webapi index page it gets the response, while when I'm using it on the project that references webapi, it doesn't hit the ajax's response bit.
In both cases the api Get method is called and returns correct results and response, it's just ajax doesn't exceute on the other project.
The ajax code is exactly the same on both webapi index page as it is on the other project page:
Ajax:
$.getJSON("http://localhost:65331/dataapi/Product")
.done(function (data) {
// On the other project it never gets to this bit below:
$.each(data, function (item) {
var label = item.Name + ' (' + item.Code + ')';
});
});
WebAPI get method:
public HttpResponseMessage Get()
{
ProductSearcher searcher = new ProductSearcher();
List<ProductModel> products = searcher.GetResults();
// Then I return the list
return Request.CreateResponse(HttpStatusCode.OK, products);
}
I tried also to use $.ajax({type: "GET", ...}) but it doesn't change anything.
Any ideas why how can I get the ajax response working?
I am working on New web application which is Using Web API as Business Layer and Knock out Js as client side frame work to binding. I have a requirement like Pass the certain search criteria to Web API Controller and get the Data from DB and Create and Send the Excel/MS-Word file on the fly as a downloadable content.
I am new to both the Web API and Knock out, I am searching on the Net and get partial solution and I am looking here to get more optimal solution for this use case.
Below is my code:
Client:
function GetExcelFile() {
var $downloadForm = $("<form method='POST'>")
.attr("action", baseUrl + "api/FileHandler/GetExcelFileTest")
.attr("target", "_blank")
$("body").append($downloadForm);
$downloadForm.submit();
$downloadForm.remove();
}
On Button Click having this code snippet to create a form on the fly and Get response from Web API.
Web API Code:
[HttpPost]
public HttpResponseMessage GetExcelFileTest()
{
var response = new HttpResponseMessage();
//Create the file in Web App Physical Folder
string fileName = Guid.NewGuid().ToString() + ".xls";
string filePath = HttpContext.Current.Server.MapPath(String.Format("~/FileDownload/{0}", fileName));
StringBuilder fileContent = new StringBuilder();
//Get Data here
DataTable dt = GetData();
if (dt != null)
{
string str = string.Empty;
foreach (DataColumn dtcol in dt.Columns)
{
fileContent.Append(str + dtcol.ColumnName);
str = "\t";
}
fileContent.Append("\n");
foreach (DataRow dr in dt.Rows)
{
str = "";
for (int j = 0; j < dt.Columns.Count; j++)
{
fileContent.Append(str + Convert.ToString(dr[j]));
str = "\t";
}
fileContent.Append("\n");
}
}
// write the data into Excel file
using (StreamWriter sw = new StreamWriter(fileName.ToString(), false))
{
sw.Write(fileContent.ToString());
}
IFileProvider FileProvider = new FileProvider();
//Get the File Stream
FileStream fileStream = FileProvider.Open(filePath);
//Set response
response.Content = new StreamContent(fileStream);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
response.Content.Headers.ContentDisposition.FileName = fileName;
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/ms-excel");
response.Content.Headers.ContentLength = fileStream.Length;
//Delete the file
//if(File.Exists(filePath))
//{
// File.Delete(filePath);
//}
return response;
}
Using this code I am able to download an Excel File. Still I have some more open questions to make this code optimal.
Q1) I need to Pass view model(Search Criteria) to API Controller Using the dynamically create form ? (OR) Any better ways to get Excel file from Web API.
Q2) I am sure it's not a good way to create Excel file in Physical folder and Get FileStream and send as a respone. How to do on the fly ? OR any other optimal ways.
Please suggest me to do better ways.. Thanks
Q1) You can quite easily pass the view-model, but it's also similarly easy to pull that information from the posted form.
Passing the view-model
If you want to pass the view-model to a WebAPI method then remember that said method must take as a parameter an object with the same properties. So if the object that you wish to post back always has the same properties then it's trivial to build a server-side class with the same properties and receive an instance of that class.
To post back this client-side object you can do something like this (uses jQuery, which I see you're already using):
$.ajax({
contentType: "application/json",
data: my-view-model.toJSON(),
type: "POST",
url: baseUrl + "api/FileHandler/GetExcelFileTest" });
I haven't attached any success or error handlers here because the JavaScript isn't concerned with the return, but you might wish to add some handlers in case an exception is thrown in your WebAPI method. I recommend doing that by adding the following to the above $.ajax() call:
statusCode: {
500: function(jqXhr, textStatus, errorThrown) {
},
[other HTTP error codes]
}
[Read the documentation for the $.ajax() call here.]
One additional tip here: when you call my-view-model.toJSON() (or self.toJSON(), if called from within your view-model) Knockout will first of all determine if your view-model contains a toJSON() method. If so, it will use this method; if not then it will call the browser's implementation of this function. However, the browser's implementation of this function will serialise everything, which can be particularly length if you have, for example, long select lists in your view-model. Therefore, if you wish only to send back a subset of the view-model's properties then define your own toJSON function on your view-model like so:
var toJSON = function() {
return {
Property1: ...,
Property2: ...
};
}
[Read more about converting a view-model to JSON here.]
Posting the form as-is
If you don't wish to expend the effort to do the view-model wiring then you can just post the form exactly like you have in your question. You can then retrieve the values from the form by using
Request.Form["my-field"];
Q2)
You're probably right in pointing out that it's not wise to create the Excel file in the physical folder. However, as far as I'm aware (interested if someone says otherwise) you'll have to use a 3rd-party library for this. Microsoft do offer an Office automation library but I have a suspicion that you also need Office to be installed at the same location.
Creating Excel spreadsheets dynamically is something I've done several times but for the actual creation I use Aspose.Cells, which requires a license. Although I do create a physical version and then delete it, I believe Aspose.Cells may allow you to create it as a stream. But take a look around, there are certainly other libraries which offer Excel automation.
Returning the File from the Server
Calling $.ajax({...}) alone won't allow you to present the user with a "Save as..." dialog. What I do in this situation - and this won't work if you wish to store the generated file only in memory (FileStream, for example) and not on the file system - is to respond to the $.ajax({...}) call with a filename for the generated file.
The next step is to direct the user towards that filename.
So I have something like this in my JavaScript:
$.ajax({
dataType: "json",
type: "GET", // you'll probably want POST in your case
url: ...,
success: function(response) {
if (response && response.Uri && response.Uri.length) {
window.location.href = [root URL] + response.Uri;
}
}
});
But don't be alarmed by this redirect. That window.location.href points directly to a folder on the server, no controller needed. Because the browser then receives a file it presents the "Save as..." dialog while remaining on the same webpage.
I am new to Angular, and set up a simple example with a REST Api config in Codeigniter that returns a json (default) thread list. No problems!
Until, I add an update to the Database. If I clear/then call getThreads again, I receive the same list of items. A page refresh solves this. I can see in firebug that its only calling the url:api/example/threadlist/id/'x' once per page load.
function ThreadsCtrl($scope, $http, $templateCache) {
$scope.getThreads = function(id) {
if (!id) { id = 'reset'; }
$http({method: 'GET', url: 'api/example/threadlist/id/' + id, cache: $templateCache}).
success(function(data) {
$scope.threadslist = data; //set view model
}).
error(function(data) {
$scope.threadslist = data || "Request failed";
});
};
How would I make it so that it always calls a new list of data rather than reuses the old.
Thanks!
If i understood your question correctly your ajax call is being cached so you have to remove cache:$templatecache from your code
I have a user script (for chrome and FF) that adds significant functionality to a page, but has recently been broken because the developers added some AJAX to the page. I would like to modify the script to listen to the pages xmlhttp requests, so that I can update my added content dynamically, based on the JSON formatted responseText that the page is receiving.
A search has turned up many functions that SHOULD work, and do work when run in the console. However they do nothing from the context of a user script.
(function(open) {
XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {
this.addEventListener("readystatechange", function() {
console.log(this.readyState);
}, false);
open.call(this, method, url, async, user, pass);
};
})(XMLHttpRequest.prototype.open);
From: How can I intercept XMLHttpRequests from a Greasemonkey script?
This works perfectly in the console, I can change this.readyState to this.responseText and it works great (though in the script I will need it to turn the JSON data into an object, and then let me manipulate it within the userscript. Not just write to the console). However if I paste it into a userscript nothing happens. The xmlhttp requests on the page do not seem to be detected by the event handler in the userscript.
The page doing the requesting is using the jquery $.get() function, if that could have anything to do with it. Though I don't think it does.
I can't imagine that there isn't a way, seems like any userscript running on an AJAX page would want this ability.
Since the page uses $.get(), it's even easier to intercept requests. Use ajaxSuccess().
This will work in a Greasemonkey(Firefox) script:
Snippet 1:
unsafeWindow.$('body').ajaxSuccess (
function (event, requestData)
{
console.log (requestData.responseText);
}
);
Assuming the page uses jQuery in the normal way ($ is defined, etc.).
This should work in a Chrome userscript (as well as Greasemonkey):
Snippet 2:
function interceptAjax () {
$('body').ajaxSuccess (
function (event, requestData)
{
console.log (requestData.responseText);
}
);
}
function addJS_Node (text, s_URL, funcToRun) {
var D = document;
var scriptNode = D.createElement ('script');
scriptNode.type = "text/javascript";
if (text) scriptNode.textContent = text;
if (s_URL) scriptNode.src = s_URL;
if (funcToRun) scriptNode.textContent = '(' + funcToRun.toString() + ')()';
var targ = D.getElementsByTagName('head')[0] || D.body || D.documentElement;
targ.appendChild (scriptNode);
}
addJS_Node (null, null, interceptAjax);
Re:
"But how then do I get that data to the script? ... (So I can) use the data later in the script."
This works in Greasemonkey(Firefox); it might also work in Chrome's Tampermonkey:
Snippet 3:
function myAjaxHandler (requestData) {
console.log ('myAjaxHandler: ', requestData.responseText);
}
unsafeWindow.$('body').ajaxSuccess (
function (event, requestData) {
myAjaxHandler (requestData);
}
);
But, if it doesn't then you cannot share JS information (easily) between a Chrome userscript and the target page -- by design.
Typically what you do is inject your entire userscript, so that everything runs in the page scope. Like so:
Snippet 4:
function scriptWrapper () {
//--- Intercept Ajax
$('body').ajaxSuccess (
function (event, requestData) {
doStuffWithAjax (requestData);
}
);
function doStuffWithAjax (requestData) {
console.log ('doStuffWithAjax: ', requestData.responseText);
}
//--- DO YOUR OTHER STUFF HERE.
console.log ('Doing stuff outside Ajax.');
}
function addJS_Node (text, s_URL, funcToRun) {
var D = document;
var scriptNode = D.createElement ('script');
scriptNode.type = "text/javascript";
if (text) scriptNode.textContent = text;
if (s_URL) scriptNode.src = s_URL;
if (funcToRun) scriptNode.textContent = '(' + funcToRun.toString() + ')()';
var targ = D.getElementsByTagName('head')[0] || D.body || D.documentElement;
targ.appendChild (scriptNode);
}
addJS_Node (null, null, scriptWrapper);
In the function getweather() I do fetch some weather data from a Json-object and store that data in the variable data. Within that function, I can handle the Json-data, but how do I access the data from outside of getweather()?
It doesn't matter if i return the variable location or data. The variable place is just not Json.
How do I handle the place variable in order to make it work as it does within the function getweather()?
var ajax = require('ajax');
var place;
place = getweather();
function getweather()
{
// Make the request
ajax(
{
url: 'http://api.openweathermap.org/data/2.5/weather?q=paris.fr', type: 'json'
},
function(data)
{
// Success!
console.log("Successfully fetched weather data!");
// Extract data
var location = data.name;
return location;
},
function(error) {
// Failure!
console.log('Failed fetching weather data: ' + error);
}
);
}
The A in AJAX stands for asynchronous. What's happening in your code is that you are trying to assign a value to place before the asynchronous call to api.openweather.org has returned.
You can check this by placing a statement like console.log(place); directly after place = getweather();. You will notice in the console that None is returned before you see Successfully fetched weather data!
This issue has been described in detail in this post. It recommends restructuring your code around your callbacks.