Download fails for large json string -Angular JS - javascript

I've written an application in angular for file download, the application is working fine only for small json string, but comes to large string the download fails. Can anyone please tell me some solution for this.
I'm using REST webservice
var json = _.getJson(); // here json value object be received from a script function
var myURL = 'rest/myMethod?jsonValue=' + JSON.stringify(json);
_.downloadFile(myURL);
The downloadFile method :
downloadFile: function(URL)
{
$.fileDownload(URL).done(function(e, response)
{
console.log('download success');
}).fail(function(e, response)
{
console.log('fail');
});
}


As per the comments, here's how to POST using Angular. I can only give you an example here. Header might depend on the angular version etc etc.
function TestController($scope, $http) {
$http({
url: 'yourwebsite',
method: "POST",
data: json, //this is your json data string
headers: {
'Content-type': 'application/json'
}
}).success(function (data, status, headers, config) {
//upload succesfull. maybe update scope with a message?
}).error(function (data, status, headers, config) {
//upload failed
});
}


I see two potential problems:
The request URL might be too long (see: this discussion)
The stringified JSON contains characters not valid in a URL
If the URL is too long, you'd have to move the jsonValue into the body of your request rather than passing it as a URL parameter.
To address the second problem, you need to URI encode the stringified value:
var myURL = 'rest/myMethod?jsonValue=' + encodeURIComponent( JSON.stringify(json) );
BTW, looking at tha fail parameters should indicate why the request failed in the first place.


Here is an example for using $http of Angular for sending a post request and download a XML file from the server.
$http({
url: '$your_URL_here$', // you should replace $your_URL_here$ by your own url
method: 'POST',
responseType: 'arraybuffer',
data: postJson, //***this is the request json data for post***
headers: {
'Content-type': 'application/json',
'Accept': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
}
}).success(function(data){
var blob = new Blob([data], {
type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
});
saveAs(blob, $fileName$);// you should replace $fileName$ by your own fileName
}
}).error(function(data){
//Some error handling method here
});
Please note that you should import the FileSaver.js to save the file from 'arraybuffer' responseType.

Related

put request in angular sends empty form data

I am trying to make a put request.
The api requires an array of numbers as request parameter
$http({
'requestpath/putrequesturl',
{
categories: [categorylist]
},
{
'method': 'PUT',
'authToken': authToken,
'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
}
});
the data is sent as
requestpath/putrequesturl?categories=%5B5,19,12%5D
the query string parameter shows correct data, but Form Data in chrome dev tools is empty.
I tried this without content-type too, but it does not work
How can i make this request to send data as Form Data (Request body)
Edit: this is what api requires to get sent (if this is necessary):
Parameter: categories type:array

Your $http params looks a little odd. Maybe you are trying to do something like this..
$http({
method: "PUT",
uri: 'requestpath/putrequesturl',
headers: {
"Content-Type": "application/json",
"authToken": authToken // assuming this should be in the header
},
data: {
categories: [categorylist]
}
})

This is how the method put should seems
$http({
method: 'PUT',
url: uri,
headers: {"Content-Type": "application/json;charset=UTF-8"},
data: someData
});
or
$http.put(url, data, config)

Getting a console.log from http.post data

I am trying to get a console log of the concatenated url, I have tried to create a new variable and then pass this to console.log with no success.
How can I get a log of the url I trying to post?
$scope.sendPaymentConfirmation = function (ordernumber) {
//function sendPaymentConfirmation(ordernumber) {
$http({
url: ('http://example.com/api/' + ordernumber), //'http://samedomain.com/GetPersons',
var posturl = url;
console.log(posturl);
method: "POST",
//data: postData,
headers: {'Content-Type': 'application/x-www-form-urlencoded'}
})
.then(function(response) {
// success : Thankyou, payment confirmation has been sent to the API server
window.alert('SUCCESS - Payment confirmation has been sent to the API server');
},
function(response) { // optional
// failed : ERROR There has been an error sending payment confirmation to the API server
window.alert('ERROR - There has been an error sending payment confirmation to the API server');
}
);
}

You need to understand that object literals cannot have statements and semicolons in them. If you don't want to do it the standard way #Quentin suggested, then you can do it like this (immediate function invocation):
$http({
url: (function(){
var posturl = 'http://example.com/api/' + ordernumber; //'http://samedomain.com/GetPersons',
console.log(posturl);
return posturl;
})(),
method: "POST",
//data: postData,
headers: {'Content-Type': 'application/x-www-form-urlencoded'}
})

You can't create a variable inside an object literal. Nor can you put any other arbitrary JS statements there.
Create the variable first. Then use it later.
var posturl = 'http://example.com/api/' + ordernumber
console.log(posturl);
$http({
url: posturl,

How to manage http content-type in web application [duplicate]

I am new to AngularJS, and for a start, I thought to develop a new application using only AngularJS.
I am trying to make an AJAX call to the server side, using $http from my Angular App.
For sending the parameters, I tried the following:
$http({
method: "post",
url: URL,
headers: {'Content-Type': 'application/x-www-form-urlencoded'},
data: $.param({username: $scope.userName, password: $scope.password})
}).success(function(result){
console.log(result);
});
This is working, but it is using jQuery as well at $.param. For removing the dependency on jQuery, I tried:
data: {username: $scope.userName, password: $scope.password}
but this seemed to fail. Then I tried params:
params: {username: $scope.userName, password: $scope.password}
but this also seemed to fail. Then I tried JSON.stringify:
data: JSON.stringify({username: $scope.userName, password: $scope.password})
I found these possible answers to my quest, but was unsuccessful. Am I doing something wrong? I am sure, AngularJS would provide this functionality, but how?

I think you need to do is to transform your data from object not to JSON string, but to url params.
From Ben Nadel's blog.
By default, the $http service will transform the outgoing request by
serializing the data as JSON and then posting it with the content-
type, "application/json". When we want to post the value as a FORM
post, we need to change the serialization algorithm and post the data
with the content-type, "application/x-www-form-urlencoded".
Example from here.
$http({
method: 'POST',
url: url,
headers: {'Content-Type': 'application/x-www-form-urlencoded'},
transformRequest: function(obj) {
var str = [];
for(var p in obj)
str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
return str.join("&");
},
data: {username: $scope.userName, password: $scope.password}
}).then(function () {});
UPDATE
To use new services added with AngularJS V1.4, see
URL-encoding variables using only AngularJS services

URL-encoding variables using only AngularJS services
With AngularJS 1.4 and up, two services can handle the process of url-encoding data for POST requests, eliminating the need to manipulate the data with transformRequest or using external dependencies like jQuery:
$httpParamSerializerJQLike - a serializer inspired by jQuery's .param() (recommended)
$httpParamSerializer - a serializer used by Angular itself for GET requests
Example with $http()
$http({
url: 'some/api/endpoint',
method: 'POST',
data: $httpParamSerializerJQLike($scope.appForm.data), // Make sure to inject the service you choose to the controller
headers: {
'Content-Type': 'application/x-www-form-urlencoded' // Note the appropriate header
}
}).then(function(response) { /* do something here */ });
See a more verbose Plunker demo
Example with $http.post()
$http.post(
'some/api/endpoint',
data: $httpParamSerializerJQLike($scope.appForm.data), // Make sure to inject the service you choose to the controller
{
headers: {
'Content-Type': 'application/x-www-form-urlencoded' // Note the appropriate header
}
}
).then(function
How are $httpParamSerializerJQLike and $httpParamSerializer different
In general, it seems $httpParamSerializer uses less "traditional" url-encoding format than $httpParamSerializerJQLike when it comes to complex data structures.
For example (ignoring percent encoding of brackets):
• Encoding an array
{sites:['google', 'Facebook']} // Object with array property
sites[]=google&sites[]=facebook // Result with $httpParamSerializerJQLike
sites=google&sites=facebook // Result with $httpParamSerializer
• Encoding an object
{address: {city: 'LA', country: 'USA'}} // Object with object property
address[city]=LA&address[country]=USA // Result with $httpParamSerializerJQLike
address={"city": "LA", country: "USA"} // Result with $httpParamSerializer

All of these look like overkill (or don't work)... just do this:
$http.post(loginUrl, `username=${ encodeURIComponent(username) }` +
`&password=${ encodeURIComponent(password) }` +
'&grant_type=password'
).success(function (data) {

The problem is the JSON string format, You can use a simple URL string in data:
$http({
method: 'POST',
url: url,
headers: {'Content-Type': 'application/x-www-form-urlencoded'},
data: 'username='+$scope.userName+'&password='+$scope.password
}).success(function () {});

Here is the way it should be (and please no backend changes ... certainly not ... if your front stack does not support application/x-www-form-urlencoded, then throw it away ... hopefully AngularJS does !
$http({
method: 'POST',
url: 'api_endpoint',
headers: {'Content-Type': 'application/x-www-form-urlencoded'},
data: 'username='+$scope.username+'&password='+$scope.password
}).then(function(response) {
// on success
}, function(response) {
// on error
});
Works like a charm with AngularJS 1.5
People, let give u some advice:
use promises .then(success, error) when dealing with $http, forget about .sucess and .error callbacks (as they are being deprecated)
From the angularjs site here "You can no longer use the JSON_CALLBACK string as a placeholder for specifying where the callback parameter value should go."
If your data model is more complex that just a username and a password, you can still do that (as suggested above)
$http({
method: 'POST',
url: 'api_endpoint',
headers: {'Content-Type': 'application/x-www-form-urlencoded'},
data: json_formatted_data,
transformRequest: function(data, headers) {
return transform_json_to_urlcoded(data); // iterate over fields and chain key=value separated with &, using encodeURIComponent javascript function
}
}).then(function(response) {
// on succes
}, function(response) {
// on error
});
Document for the encodeURIComponent can be found here

If it is a form try changing the header to:
headers[ "Content-type" ] = "application/x-www-form-urlencoded; charset=utf-8";
and if it is not a form and a simple json then try this header:
headers[ "Content-type" ] = "application/json";

From the $http docs this should work..
$http.post(url, data,{headers: {'Content-Type': 'application/x-www-form-urlencoded'}})
.success(function(response) {
// your code...
});

$http({
method: "POST",
url: "/server.php",
headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
data: "name='Олег'&age='28'",
}).success(function(data, status) {
console.log(data);
console.log(status);
});

you need to post plain javascript object, nothing else
var request = $http({
method: "post",
url: "process.cfm",
transformRequest: transformRequestAsFormPost,
data: { id: 4, name: "Kim" }
});
request.success(
function( data ) {
$scope.localData = data;
}
);
if you have php as back-end then you will need to do some more modification.. checkout this link for fixing php server side

Though a late answer, I found angular UrlSearchParams worked very well for me, it takes care of the encoding of parameters as well.
let params = new URLSearchParams();
params.set("abc", "def");
let headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded'});
let options = new RequestOptions({ headers: headers, withCredentials: true });
this.http
.post(UrlUtil.getOptionSubmitUrl(parentSubcatId), params, options)
.catch();

This worked for me. I use angular for front-end and laravel php for back-end. In my project, angular web sends json data to laravel back-end.
This is my angular controller.
var angularJsApp= angular.module('angularJsApp',[]);
angularJsApp.controller('MainCtrl', function ($scope ,$http) {
$scope.userName ="Victoria";
$scope.password ="password"
$http({
method :'POST',
url:'http://api.mywebsite.com.localhost/httpTest?callback=JSON_CALLBACK',
data: { username : $scope.userName , password: $scope.password},
headers: {'Content-Type': 'application/json'}
}).success(function (data, status, headers, config) {
console.log('status',status);
console.log('data',status);
console.log('headers',status);
});
});
This is my php back-end laravel controller.
public function httpTest(){
if (Input::has('username')) {
$user =Input::all();
return Response::json($user)->setCallback(Input::get('callback'));
}
}
This is my laravel routing
Route::post('httpTest','HttpTestController#httpTest');
The result in browser is
status 200
data JSON_CALLBACK({"username":"Victoria","password":"password","callback":"JSON_CALLBACK"});
httpTesting.js:18 headers function (c){a||(a=sc(b));return
c?a[K(c)]||null:a}
There is chrome extension called postman. You can use to test your back-end url whether it is working or not.
https://chrome.google.com/webstore/detail/postman-rest-client/fdmmgilgnpjigdojojpjoooidkmcomcm?hl=en
hopefully, my answer will help you.

response type blob but getting xml data

I have a angularjs function to call to a API. API returning an image one time.it is returning a xml another time. I can show returned image if I set response type blob as follow
$http({
url: apiConstants.BASE_URL + 'login',
method: "POST",
responseType: "blob",
data: {
"Req": req
},
headers: {
'X-Username': aUser,
'X-Password': aPass,
"Content-Type": "application/xml"
},
dataType: "xml"
}).success(function(data, status) {
console.log(data);
}
console.log printing blob object. But when API returns xml content it is also returning as a blob object. I tried to get xml content of the blob but couldn't find a way :(. Can some one suggest me a way to get xml data from the blob object

Finally I found the answer. We can extract blob object using FileReader.
What I did was,
$http({
url: apiConstants.BASE_URL + 'login',
method: "POST",
responseType: "blob",
data: {
"Req": req
},
headers: {
'X-Username': aUser,
'X-Password': aPass,
"Content-Type": "application/xml"
},
dataType: "xml"
}).success(function(data, status) {
var reader = new FileReader();
reader.addEventListener("loadend", function() {
console.log(reader.result);
}
reader.readAsText(data);
}

How do I get an AngularJS http post to a PHP file?

I'm trying to decipher how to get the json post from a JavaScript file to a PHP file.
This is my JS file:
var url2 = '/php/extractkeywords.php';
var jsonData = angular.toJson({
text: $scope.userTyping,
data: post
});
$http({
url: url2,
method: "POST",
data: "data=" + window.btoa($scope.textHTML),
headers: {'Content-Type': 'application/x-www-form-urlencoded'}
}).success(function (data, status, headers, config) {
// Sending to extractkeywords.php
})
And this is my PHP file:
$data = json_decode(urldecode(base64_decode($_POST["data"])));
When I try to print $data, I don't get anything.

You need to pass JSON, here:
data: "data=" + window.btoa($scope.textHTML),
you are using the equals sign, which should not be used. JSON can have objects, arrays and key-value pairs, so you need a key. I believe this would improve your code:
data: {data: window.btoa($scope.textHTML)},

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