I need to create a very simple script that makes a small calculation.
I have a URL that returns a value in the following format: 10.00, something like this:
I need to create a function that takes the value returned from this URL and subtracts that value (-5.00), then prints the result to a <span> that has a specific ID.
<span id="result"></span>
How can I create a function of this type?
To make a request to the API and calculate on the result would look something like this:
function makeRequest() {
var xmlHttp = new XMLHttpRequest();
xmlHttp.onreadystatechange = function() {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
calcPreco(xmlHttp.responseText);
}
xmlHttp.open("GET", "PONHA_SUA_URL_AQUI", true); // true para asynchronous
xmlHttp.send(null);
}
function calcPreco(preco) {
preco = preco.replace(",", ".");
preco -= 5;
document.getElementById("result").textContent = preco;
}
To recover the price that is in a url parameter would look something like this:
function calcPreco(){
let preco = new URL(location.href).searchParams.get("get");
preco -= 5;
document.getElementById("result").textContent=preco;
}
If you receive a number with , in the parameter (something like 10,50 ) do:
function calcPreco(){
let preco = new URL(location.href).searchParams.get("get");
preco = preco.replace(",", ".");
preco -= 5;
document.getElementById("result").textContent=preco;
}
How can I always get the last object from the array at the moment I'm using the following function but only takes the first one.
%pre%You can search for length using %code% less than 1 that will always return the last item