I'm a very beginner in JavaScript, I recently learned it at school indeed. I have to include and get responses from the OpenWeatherMap API on a web page. For now, all I want to do is getting the temperature in the city specified in the API's URL.
I struggled a long time before asking for your assistance but I couldn't figure my problem out.
Here is my code :
var btn = document.getElementById("btn");
var p = document.getElementById("paragraphe");
var txtf = document.getElementById("txtf");
btn.addEventListener('click', fun, false);
function fun(){
var xhr = new XMLHttpRequest();
xhr.open('GET','http://api.openweathermap.org/data/2.5/weatherq=London&appid=2de143494c0b295cca9337e1e96b00e0&units=metric', true)
xhr.addEventListener('readystatechanged', function(){
if(xhr.readyState == 4 && xhr.status == 200){
var obj = JSON.parse(xhr.responseText)
p.innerHTML = obj.main.temp;
}
}, false)
xhr.send();
}
Thank you for your help !
At first glance, check your spelling. I can't see your HTML, but possible issues could be: #paragraphe and #txtf.
Also, change the event name readystatechanged to readystatechange.
One tip, add console.log("insert check data here"); throughout your code. That way to can see in the console log where it is breaking. This really helps with trouble shooting!
Related
I'm working on an Electron app and trying to integrate the Easy Digital Downloads Software Licensing WordPress plugin. I haven't done much with HTTP communication in Electron/Javascript so this may be a naive question.
The problem: I am able to get a license activation response from my EDD server and while there is no specific error, for some reason a license is not activated. The odd thing is that if I use a URL and query string in a browser with the same data, the plugin responds as expected: I can activate, deactivate and check the status of a license.
So EDD seems to be working and there are no errors with Electron. But something is missing. Initially I was using the net Electron module but after this issue came up, I switched to using the example script from EDD (below) which uses XMLHttpRequest. With that I get the following response back:
{"success":true,"license":"valid","item_id":539,"item_name":"My
Awesome App","license_limit":1,"site_count":0,"expires":"2020-12-19
23:59:59","activations_left":1,"checksum":"f2d66c6844b37d1fa931b813c408",
"payment_id":248,"customer_name":"Marvin
Gardens","customer_email":"marvin#home.com","price_id":false}
Which is fine except that "activations_left":1 never changes and it should given "license_limit":1. So something is wrong.
On the other hand, if I use a URL with a query string in a browser, the "activations_left" is decremented and license activation only works once (as it should). For example, this works:
http://YOURSITE.com/?edd_action=activate_license&item_id=8&license=cc22c1ec86304b36883440e2e84cddff&url=http://licensedsite.com
My Question: is there some fundamental difference between these two methods? Is there something I need to add to my XMLHttpRequest? I have a support ticket open with EDD but I need to keep moving with this. And sorry to be so long-winded!
UPDATE:
#aw04 suggested I try using GET – just tried that and I "get" the same response as before: no error but also no activation.
Could there be some property which should (or shouldn't) be in the Electron request which is (or isn't) in a browser request by default?
xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState === XMLHttpRequest.DONE && this.status === 200) {
console.log('xhttp.responseText', xhttp.responseText);
}
}
var url = "http://YOURSITE.com/?edd_action=activate_license&item_id=8&license=cc22c1ec86304b36883440e2e84cddff"
xhttp.open("GET", url);
xhttp.send();
var xhttp = new XMLHttpRequest();
var postUrl = 'http://<domain.com>/edd-sl/';
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
console.log(xhttp.responseText);
}
}
var data = {
edd_action: 'check_license',
license: '<license key>',
item_name: encodeURIComponent('<item name>'),
};
xhttp.open("POST", postUrl, true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.setRequestHeader("Access-Control-Allow-Origin", "http://local.dev");
var values = '';
for (var key in data){
values += key + '=' + data[ key ] + '&';
}
values = values.substring(0, values.length - 1);
xhttp.send(values);
Based on some help from Easy Digital Downloads support folks, this is resolved.
The issue had to do with a property in their Software Licensing plugin setup: "Do not check URL". I hadn't enabled that with the result that my API call from Electron failed and the one using a browser succeeded because the browser was adding headers that Electron was not.
After enabling "Do not check URL", calls from within Electron work. I guess there is also an option to pass in a URL, but since I am using EDD for licensing desktop software, that didn't seem like a needed option.
Anyway, hope this helps someone.
I've been working to build my first serverless web application, using AWS Lambda, API Gateway, and S3. The good news is, I've gotten it to work, and everything is talking to each other like I want it to. The bad news is, the text response I get back is ugly, and I'm having trouble figuring out how to fix it.
Website: http://wmcleanzodiac.s3-website-us-east-1.amazonaws.com
If you click the button to trigger the function, you'll see the response is written like:
{"Your Zodiac sign is :" "result"}
I'm trying to remove the quotes and brackets. I tried JSON.parse, but that just yielded object Object. Any hints on where I can look to find a solution?
To get the response, I'm using the following javascript function:
<script>
function Lambda(){
var month = document.getElementById("inmonth").value;
var day = document.getElementById("inday").value;
var date = {month : month, day : day};
const xhttp = new XMLHttpRequest();
const url= 'https://c50vvxrko9.execute-api.us-east-1.amazonaws.com/Zodiac'
xhttp.open("POST", url, true);
xhttp.send(JSON.stringify(date));
xhttp.onreadystatechange = function(){
if (this.readyState == 4 && this.status == 200) {
var resultElement = $("#sign-result");
resultElement.text(this.responseText);
}
}
}
You put the whole response into the HTML Element.
To fix this, one way is to modify your lambda to return JSON in Format like: {"result": "<the_result>"}.
Then display it using: resultElement.text(this.responseText.result); in your javascript code.
I am wondering if it is possible to make an API call from within a design doc. I have tried the code below, however I am getting the following error message.
{"error":"forbidden","reason":"CSRF Cookie/Header mismatch"}
This is the code:
function(head, req) {
var id = req.query.id;
var contactName = 'This is the new contact name!!';
var sendString = '{"PrimaryContactName":"' + contactName + '"}';
var xhr = new XMLHttpRequest();
xhr.open('PUT", <URL>, false);
xhr.send(sendString);
var sendStatus = xhr.status;
}
Thanks!
You aren't going to be able to use AJAX from CouchDB. (it's not a web browser)
If you want changes in your database to be propagated to other data-sources, you can use the _changes feed. That will be a much more robust solution no matter how you slice it.
I'm using XHR 2 to upload/save files.
According to the response of the server I want to perform an action. For example if the responce is "Saved" I want to hide a div or if the response is "Not Saved" I want to show another div etc...
I implemented what appears to be a simple code that should be working , but is not
Here is the snippet of the XHR
//initialize
var xhr = new XMLHttpRequest();
xhr.open('POST', 'upload.php');
xhr.responseType="text";
xhr.onload = function() {
//if all ok....
if (xhr.status === 200)
{
//update html5 progress bar
progress.value = progress.innerHTML = 100;
//get the respnse
var data=xhr.response;
//convert it to sting - kind of overkill, I know, but I'm stack
var data2=data.toString();
//alert it -- works
alert('data2 '+data2);
//now, do something, according to the response -- NOT working, never alert anything
if (data2=="Not Saved"){alert('Ooops, not saved');}
if(data2=="Saved"){alert('It's all good');}
if(data2=="File too big"){alert('hey, you are watching Jake and Amir');}
document.getElementById('imagesaved').innerHTML=data;
}
//refers to if (xhr.status === 200)
else {document.getElementById("imagesaved").innerHTML="Connect to server failed";}
What is wrong here? This should be working right? Any suggestions?
Thanks
EDIT
I put the alerts for testing. What I actually want to do is call some functions.
If I put
if (data2=="Not Saved"){functionOne();}
if(data2=="Saved"){functionTwo();}
if(data2=="File too big"){functionThree();}
the functions never get called
if I put
if (data2!="Not Saved"){functionOne();}
if(data2!="Saved"){functionTwo();}
if(data2!="File too big"){functionThree();}
ALL the functions are called!!!
I still dont get it...Maybe its something with the response? Or the onload function?
Thanks again
What I finally did is make the server response with numbers, not text. So encoding does not matter any more...
This is the code
var xhr = new XMLHttpRequest();
xhr.onload = function() {
if (xhr.status == 200)
{
var data=xhr.response;
if(data==1)
//say to the user is saved
{document.getElementById('imagesaved').innerHTML="Saved";}
//say to the user, there was an error
else{document.getElementById('imagesaved').innerHTML="Error";}
}
//say to the user that connection to the server failed
else {document.getElementById("imagesaved").innerHTML="Cannot connect";}
};
xhr.open('POST', 'upload.php');
xhr.send(formData);
This is a workaround. I dont know if its the right way to solve this problem , technically. I decided to post it anyway, to help others to quickly solve similar problems. If anyboy else has a better way to suggest , please do.
In this line : if(data2=="Saved"){alert('It's all good');}, you have to escape " ' ".
So convert it to : if(data2=="Saved"){alert('It\'s all good');}
Are you sure that the response of your ajax is text/plain ?
Look on the console (ctrl+shift+i on chrome, F12 on firefox), on net or network tab.
Look on console tab if you got some javascript errors too.
I am writing some code in JavaScript. In this code i want to read a json file. This file will be loaded from an URL.
How can I get the contains of this JSON file in an object in JavaScript?
This is for example my JSON file located at ../json/main.json:
{"mainStore":[{vehicle:'1',description:'nothing to say'},{vehicle:'2',description:'nothing to say'},{vehicle:'3',description:'nothing to say'}]}
and i want to use it in my table.js file like this:
for (var i in mainStore)
{
document.write('<tr class="columnHeaders">');
document.write('<td >'+ mainStore[i]['vehicle'] + '</td>');
document.write('<td >'+ mainStore[i]['description'] + '</td>');
document.write('</tr>');
}
Here's an example that doesn't require jQuery:
function loadJSON(path, success, error)
{
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function()
{
if (xhr.readyState === XMLHttpRequest.DONE) {
if (xhr.status === 200) {
if (success)
success(JSON.parse(xhr.responseText));
} else {
if (error)
error(xhr);
}
}
};
xhr.open("GET", path, true);
xhr.send();
}
Call it as:
loadJSON('my-file.json',
function(data) { console.log(data); },
function(xhr) { console.error(xhr); }
);
XHR can be used to open files, but then you're basically making it hard on yourself because jQuery makes this a lot easier for you. $.getJSON() makes this so easy to do. I'd rather want to call a single line than trying to get a whole code block working, but that's up to you...
Why i dont want to use jQuery is because the person i am working for doesn't want it because he is afraid of the speed of the script.
If he can't properly profile native VS jQuery, he shouldn't even be programming native code.
Being afraid means he doesn't know what he is doing. If you plan to go for performance, you actually need to know how to see how to make certain pieces of code faster. If you are only just thinking that jQuery is slow, then you are walking into the wrong roads...
JSON has nothing to do with jQuery.
There is nothing wrong with the code you have now.
To store the variable mainStore, it is a variable in that json.
You should store that json to a variable:
var myJSON = {"mainStore":[{vehicle:'1',description:'nothing to say'},{vehicle:'2',description:'nothing to say'},{vehicle:'3',description:'nothing to say'}]};
var mainStore = myJSON.mainStore;
//.. rest of your code.
I understand that by "reading a json file" you mean making the request to the url that returns json content. If so, then can you explain why you don't want to use jQuery for this purpose? It has $.ajax function that is perfectly suitable for this and covers the browsers' differences.
If you want to read the file then you have to do it server-side, e.g. php and provide it somehow to the dom (there are different methods) so js can use it. Reading file from disk with js is not possible.
function loadDoc() {
const xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
console.log(xhttp.responseText)
}
};
xhttp.open("GET", "./user.json");
xhttp.send();
}
Naming using the linux filename structure
You can store the responseText to a variable or whatever you want to do with it