async function calculate(){
    const valA = document.getElementById("var_a").value
    const valB = document.getElementById("var_b").value
    const oper = document.getElementById("operation").value
    const type = document.getElementById("valueType").value

    var url = `http://localhost:8080/${oper}?type=${type}&a=${valA}&b=${valB}`

    console.log(url)
    const responce = await fetch(url)
    const json = await responce.json()
    if(json.content.errorCode != null){
        document.getElementById("ansver").innerHTML = "Ошибка: "+ json.content.errorMassage;
    }
    else{
        document.getElementById("ansver").innerHTML = "Ответ: "+ json.content
    }
}
function changeVariableInputs(){
    const oper = document.getElementById("operation").value

    if(oper === "len" || oper === "inv"){
        document.getElementById("InputFieldB").classList.add("hide")
    }
    else{
        document.getElementById("InputFieldB").classList.remove("hide")
    }
}
function changeInputBoxType(){
    const type = document.getElementById("valueType").value
    if(type === "number"){
        document.getElementById("var_a").type = "number"
        document.getElementById("var_b").type = "number"
    }
    else{
        document.getElementById("var_a").type = "text"
        document.getElementById("var_b").type = "text"
    }
}