IP_PIbd-21_Balberova_D.N./front/script.js

const calculateButton = document.getElementById("calculate");
const calculateStrButton = document.getElementById("calculateStr");
const first = document.getElementById("first");
const second = document.getElementById("second");
const select = document.getElementById("operation");
const result = document.getElementById("result");

calculateButton.onclick = function() {
    calculate("num");
};
calculateStrButton.onclick = function() {
    calculate("str");
};

function calculate(parametr) {
    switch (parseInt(select.value)) {
        case 1:
            doSmth("plus", parametr)
            break;
        case 2:
            doSmth("minus", parametr)
            break;
        case 3:
            doSmth("mult", parametr)
            break;
        case 4:
            doSmth("div", parametr)
            break;
    };
}

function checkNum(res) {
    if (res.indexOf(".") != -1) 
        return parseInt(res)
    else
        return res
}

function doSmth(address, type) {
    console.log("Тип " + type)
    fetch(`http://localhost:8080/${address}?first=${first.value}&second=${second.value}&type=${type}`)
        .then(response => response.text())
        .then(res => result.innerHTML = checkNum(res));
}