My code is below:
$.getJSON('https://ajax.googleapis.com/ajax/services/search/images?q=Google&v=1.0',
function(json) {
alert(json);
})
You can try this code here: http://jsbin.com/ofaru3/edit
The ajax is error
imagesFailed to load resource
How cna I fix this problem? Thanks!
You need &callback=? on the URL there to trigger JSONP, like this:
$.getJSON('https://ajax.googleapis.com/ajax/services/search/images?q=Google&v=1.0&callback=?',
function(json) {
alert(json);
});
You can test it out here. Without the &callback? it's trying to fetch the data from a remote domain with an XmlHttpRequest (AJAX) and failing/being blocked due to the same origin policy. This is exactly the type of situation JSONP is for.
From the $.getJSON() docs:
JSONP
If the URL includes the string "callback=?" (or similar, as defined by the server-side API), the request is treated as JSONP instead. See the discussion of the jsonp data type in $.ajax() for more details.
Related
I'm writing a simple api for training using express. Here's my testing code:
var express = require('express');
var app = express();
app.post("/api/:var_name", function(req, res) {
res.send(req.params.var_name);
});
is simply testing to see if POST is working. When I call http://localhost:3000/api/1 I get Cannot GET /api/1, so the server is obviously interpreting the POST request as GET, what do I need to do to call POST instead?
Anything you call in the address bar of your browser will be sent via get. This is due to the fact that post-messages (and almost all other methods) do have a body-part. But there is no way for your browser to send additional information inside the body of the http packet.
If you want to test your routes for any method other than GET I would suggest you download a tool like postman.
https://www.getpostman.com/
BEWARE: This is my preference. You can of curse also use text based browsers like curl to test it.
The server interprets the request according to the verb you set in the HTTP request. If no method/verb is specified it is interpreted as GET(not sure about this part).
When you call that URL, you need to use the method as well. For example if you use the fetch API, you can call it like:
fetch(url, {method:"POST"})
If you're entering it in your browser and expect it to be interpreted as a post request, it's not. All browser url requests are GET. Use a tool like Postman to call different HTTP verbs. It's really useful when creating such APIs.
You can check out this answer on details of how to add body and headers to a post request: Fetch: POST json data
I have installed xwiki successfully and able to generate wiki pages using velocity template language.
Could anyone please tell me that how can I pass javascript varible to velocity templete. I have gone through few forums that I need to pass the parameter to server to get this but I have no idea. Please find the files below.
<script type="text/javascript">
function generateFunction()
{
var variable = document.getElementById('text').value;
}
</script>
#set($test = "variable")
$test
You have to make an ajax call from the client to the server.If you're using jquery, you would have something like:
$.post('/send/my/var', { 'variable' : value });
Without jquery, see this XmlHttpRequest documentation.
And then, on the server side, the /send/my/var URL should reach a template where you can do:
#set($test = $params.variable)
And you would do something useful with it on the server-side, like store it in the session, in the database, etc.
If you need to send back something from Velocity to Javascript, then you'll typically have to format JSON code, and add an asynchronous completion callback parameter to the ajax call:
$.post('/send/my/var', { 'variable' : value },
function(data)
{
// do something with data sent back from the server
});
It's also possible to have synchronous calls, that is to have javascript wait for the server response, but it's generally a bad idea to do so and I won't extrapolate on it here.
As a final note, you should also implement a proper error handling. With jQuery for instance, the syntax would be:
$(document).ajaxError(function(event, jqxhr, settings, message)
{
console.log(message);
});
It can't be done,
Apache Velocity template is a server side engine,
Meaning that on the server, Velocity will get the template and try to render, only after it finished to render the template, it will be returned to client which will execute client code as Javascript
Velocity alternative is freemarker, which I found similar question and answer , Question:
How to call freemarker function with param from javascript
Answer:
There's no way for the client side web browser code to call a server side Freemarker function
I have followed the guide here to create a postman mock for a postman collection. The mock seem to be successfully created, but I have no idea how to use the mock service.
I've been given a url for the mock, but how do I specify one of my requests? If I issue a GET request to https://{{mockid}}.mock.pstmn.io I get the following response:
{
"error": {
"name": "mockRequestNotFoundError",
"message": "We were unable to find any matching requests for the mock path (i.e. undefined) in your collection."
}
}
According to the same guide mentioned above the following url to "run the mock" https://{{mockId}}.mock.pstmn.io/{{mockPath}} but what exactly is mockPath?
Within my collection I have plenty of folders, and inside one of these folders I have a request with an example response. How do I access this example response through the mock? Thanks for all help in advance!
Here's the Postman Pro API, which doesnt mention a lot more than just creating reading mocks.
I had the same issue seeing an irrelevant error but finally I found the solution. Unfortunately I cannot find a reference in Postman website. But here is my solution:
When you create a Mock server you define your first request (like GET api/v1/about). So the Mock server will be created but even when you obtain your API key and put it in the header of request (as x-api-key) it still returns an error. It doesn't make sense but it turned out that defining the request is not enough. For me it only started returning a response when I added an Example for the request.
So I suggest for each request that you create, also create at least one example. The request you send will be matched with the examples you have created and the matched response will be returned. You can define body, headers and the HTTP status code of the example response..
I have no Pro Postman subscription and it worked for me using my free subscription.
Menu for adding an example or selecting one of them for editing:
UI for defining the example (See body, headers and status) :
How to go back to the request page:
Here is the correct reply I get based on my example:
If you request in the example is a GET on api.domain.com/api/foo then the mockPath is /api/foo and your mock endpoint is a GET call to https://{{mockid}}.mock.pstmn.io/api/foo.
The HTTP request methods and the the pathname as shown in the image below constitute a mock.
For ease of use the mock server is designed to be used on top of collections. The request in the examples is used as is along with response attached to it. The name of the folder or collection is not a part of the pathname and is not factored in anywhere when using a mock. Mocking a collection means mocking all the examples in within your collection. An example is a tuple of request and response.
An optional response status code if specified lets you fetch the appropriate response for the same path. This can be specified with the x-mock-response-code header. So passing x-mock-response-code as 404 will return the example that matches the pathname and has a response with status code of 404.
Currently if there are examples with the same path but different domains, and mock is unable to distinguish between them it will deterministically return the first one.
Also if you have several examples for the same query :
Mock request accept another optional header, x-mock-response-code, which specifies which integer response code your returned response should match. For example, 500 will return only a 500 response. If this header is not provided, the closest match of any response code will be returned.
Optional headers like x-mock-response-name or x-mock-response-id allow you to further specify the exact response you want by the name or by the uid of the saved example respectively.
Here's the documentation for more details.
{{mockPath}} is simply the path for your request. You should start by adding an example for any of your requests.
Example:
Request: https://www.google.com/path/to/my/api
After adding your mock server, you can access your examples at:
https://{{mockId}}.mock.pstmn.io/path/to/my/api
I'm trying to do a POST to a service running on localhost with jQuery AJAX, but it keeps returning status code 0 even after I've set jQuery.support.cors = true. I can also navigate to my WCF REST service successfully from my browser. This is what my JavaScript looks like:
<script>
jQuery.support.cors = true;
$(document).ready(function(){
$.ajax({
type: "POST",
url: "http://localhost:8000/Test",
data: '{"test":"test"}',
contentType: "application/json",
dataType: "json",
success: function (msg) {
alert('success');
},
error:function(x,e){
if(x.status==0){
alert('error 0');
}
}
});
});
</script>
Does anyone know what could be causing this? I should also mention that I can't POST to anything on localhost using jQuery.
According to Fiddler, the JSON data is not sent, and a HTTP OPTIONS is done instead of a POST.
try this
var dataObj = {test:"test"};
var json = JSON.stringify(dataObj);
then in your ajax call
data: json,
I didn't want to spend anymore time on this issue, so I resorted to using raw HTML form POST as the usage of JSON wasn't essential in my case.
For anyone else having the same issues outlined in the original post, see this thread for an explanation and a solution: Problem sending JSON data from JQuery to WCF REST method
To summarize, your service needs to be able to handle the HTTP OPTIONS method if it is expected to respond to cross domain calls.
You should use a tool like network monitor etc. to see if the browser is asking the server for the allowed headers (using the OPTIONS header request), you may need to supply the correct headers in an OPTIONS response before the actual request is sent to the server (see the article at the bottom).
Also, you could try adding this to the actual call or the ajaxSetup, as you will need to tell the browser to send credentials and allow the cross domain call (I know someone else already mentioned 'crossDomain'):
$.ajaxSetup({
crossDomain: true,
xhrFields: {
withCredentials: true
}
});
Have a read of this if you get time too.. https://developer.mozilla.org/en/http_access_control
So, when the request is cross domain, jQuery will send your post request as a get request anyways.
Are you accessing "localhost" in the URL but then your application is sending the requests to the local IP of your machine instead of localhost? Because that's technically cross-domain, which means that you won't receive the request in the expected manner.
E.g. (just tested this locally)
Visiting my local site at:
http://localhost/test/
A form on the site submits to my local ip address instead of localhost via $.post():
<form action="http://10.0.0.17/test/" method="post">
....[form stuff...]
</form>
This is a cross-domain request
If you're calling $.post() or jquery's ajax() call set to post, it automatically moves your parameters from the post body into the query string.
If you ARE accessing local host, try hitting the site via whatever address your jquery post() method is using as the domain and see if that helps.
See more on cross-domain policies:
http://en.wikipedia.org/wiki/Same_origin_policy
Send the data as an Object literal instead of a string
data: '{"test":"test"}',
to
data: {test:"test"},
I need to POST data to a server in a different domain. That server is using SSL and expects the data to be in the form of a JSON string. I am attempting to do this from javascript.
I create the data and use JSON.stringify() to get it into the correct format. Then I send it as follows:
var url = "https://api.postageapp.com/v.1.0/send_message.json";
http=new XMLHttpRequest();
http.open("POST", url, true);
http.setRequestHeader("Content-type", "application/json");
http.setRequestHeader("Connection", "close");
// create the data in a data structure named post_data
var JSONText = JSON.stringify(post_data);
http.send(JSONText);
Doing a packet trace I see my client do a handshake with the server but then twice the server replies with "Encrypted alert" including the last time it sends a packet back. The browser debugger always shows a 405 - Method Now Allowed error.
What am I missing to get this to work? When they try it within their domain it runs fine.
You need server to return a HTTP Header like that:
header('Access-Control-Allow-Origin: *');
Live example:
Making cross domain JavaScript requests using XMLHttpRequest or XDomainRequest
You cannot do a cross domain post like that.
Alternative is to use Server side proxy (read this link for a nice explanation as to why you can't do that) or iframe approach.
Strictly speaking it should not be possible (due to security issues) however using a workaround called JSONP you can achieve this with a RESTful web service.
See the link below.
http://en.wikipedia.org/wiki/JSONP
MS has some code you can download somewhere on the internet with specific bindings the code is called.
JSONPBehaviour.cs
JSONPBindingElement.cs
JSONPBindingExtension.cs
JSONPEncoderFactory.cs