I have an HTML page with a button on it. When I click on that button, I need to call a REST Web Service API. I tried searching online everywhere. No clue whatsoever. Can someone give me a lead/Headstart on this? Very much appreciated.
This question is related to
javascript
html
rest
web-services
$("button").on("click",function(){
//console.log("hii");
$.ajax({
headers:{
"key":"your key",
"Accept":"application/json",//depends on your api
"Content-type":"application/x-www-form-urlencoded"//depends on your api
}, url:"url you need",
success:function(response){
var r=JSON.parse(response);
$("#main").html(r.base);
}
});
});
Without a doubt, the simplest method uses an invisible FORM element in HTML specifying the desired REST method. Then the arguments can be inserted into input type=hidden value fields using JavaScript and the form can be submitted from the button click event listener or onclick event using one line of JavaScript. Here is an example that assumes the REST API is in file REST.php:
<body>
<h2>REST-test</h2>
<input type=button onclick="document.getElementById('a').submit();"
value="Do It">
<form id=a action="REST.php" method=post>
<input type=hidden name="arg" value="val">
</form>
</body>
Note that this example will replace the page with the output from page REST.php. I'm not sure how to modify this if you wish the API to be called with no visible effect on the current page. But it's certainly simple.
Usual way is to go with PHP and ajax. But for your requirement, below will work fine.
<body>
https://www.google.com/controller/Add/2/2<br>
https://www.google.com/controller/Sub/5/2<br>
https://www.google.com/controller/Multi/3/2<br><br>
<input type="text" id="url" placeholder="RESTful URL" />
<input type="button" id="sub" value="Answer" />
<p>
<div id="display"></div>
</body>
<script type="text/javascript">
document.getElementById('sub').onclick = function(){
var url = document.getElementById('url').value;
var controller = null;
var method = null;
var parm = [];
//validating URLs
function URLValidation(url){
if (url.indexOf("http://") == 0 || url.indexOf("https://") == 0) {
var x = url.split('/');
controller = x[3];
method = x[4];
parm[0] = x[5];
parm[1] = x[6];
}
}
//Calculations
function Add(a,b){
return Number(a)+ Number(b);
}
function Sub(a,b){
return Number(a)/Number(b);
}
function Multi(a,b){
return Number(a)*Number(b);
}
//JSON Response
function ResponseRequest(status,res){
var res = {status: status, response: res};
document.getElementById('display').innerHTML = JSON.stringify(res);
}
//Process
function ProcessRequest(){
if(method=="Add"){
ResponseRequest("200",Add(parm[0],parm[1]));
}else if(method=="Sub"){
ResponseRequest("200",Sub(parm[0],parm[1]));
}else if(method=="Multi"){
ResponseRequest("200",Multi(parm[0],parm[1]));
}else {
ResponseRequest("404","Not Found");
}
}
URLValidation(url);
ProcessRequest();
};
</script>
Before we try to put anything on the front end of the website, let's open a connection the API. We'll do so using XMLHttpRequest objects, which is a way to open files and make an HTTP request.
We'll create a request variable and assign a new XMLHttpRequest object to it. Then we'll open a new connection with the open() method - in the arguments we'll specify the type of request as GET as well as the URL of the API endpoint. The request completes and we can access the data inside the onload function. When we're done, we'll send the request.
// Create a request variable and assign a new XMLHttpRequest object to it.
var request = new XMLHttpRequest()
// Open a new connection, using the GET request on the URL endpoint
request.open('GET', 'https://ghibliapi.herokuapp.com/films', true)
request.onload = function () {
// Begin accessing JSON data here
}
}
// Send request
request.send()
Here is another Javascript REST API Call with authentication using json:
<script type="text/javascript" language="javascript">
function send()
{
var urlvariable;
urlvariable = "text";
var ItemJSON;
ItemJSON = '[ { "Id": 1, "ProductID": "1", "Quantity": 1, }, { "Id": 1, "ProductID": "2", "Quantity": 2, }]';
URL = "https://testrestapi.com/additems?var=" + urlvariable; //Your URL
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = callbackFunction(xmlhttp);
xmlhttp.open("POST", URL, false);
xmlhttp.setRequestHeader("Content-Type", "application/json");
xmlhttp.setRequestHeader('Authorization', 'Basic ' + window.btoa('apiusername:apiuserpassword')); //in prod, you should encrypt user name and password and provide encrypted keys here instead
xmlhttp.onreadystatechange = callbackFunction(xmlhttp);
xmlhttp.send(ItemJSON);
alert(xmlhttp.responseText);
document.getElementById("div").innerHTML = xmlhttp.statusText + ":" + xmlhttp.status + "<BR><textarea rows='100' cols='100'>" + xmlhttp.responseText + "</textarea>";
}
function callbackFunction(xmlhttp)
{
//alert(xmlhttp.responseXML);
}
</script>
<html>
<body id='bod'><button type="submit" onclick="javascript:send()">call</button>
<div id='div'>
</div></body>
</html>
I think add if (this.readyState == 4 && this.status == 200) to wait is better:
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
// Typical action to be performed when the document is ready:
var response = xhttp.responseText;
console.log("ok"+response);
}
};
xhttp.open("GET", "your url", true);
xhttp.send();
Your Javascript:
function UserAction() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
alert(this.responseText);
}
};
xhttp.open("POST", "Your Rest URL Here", true);
xhttp.setRequestHeader("Content-type", "application/json");
xhttp.send("Your JSON Data Here");
}
Your Button action::
<button type="submit" onclick="UserAction()">Search</button>
For more info go through the following link (Updated 2017/01/11)
Source: Stackoverflow.com