Rails loads my javascript only after page reload

I have this problem in Rails when my javascript does not load when I enter the page. I have to reload the page after entering it and only then does it load.

This is what my javascript file looks like:

$(function() {
    initPage();
});
$(window).bind('page:change', function() {
    initPage();
});
function initPage() {
    window.onload = function () {
    var div = document.getElementById("buttons");
    var btn1 = document.createElement("button"); btn1.innerHTML = "Add one calculator"; btn1.id = "one";
    div.appendChild(btn1);
    btn1.onclick = function () {make_buttons ('calc');};
};

function make_buttons (id) {
    var div_id = Math.floor(Math.random()*999);
    var input_id = Math.floor(Math.random()*999);
    var operators = ["*","/","+","-","=","c","DEL"];
    var parent = document.getElementById(id);
    var in_div = document.createElement("div"); in_div.id = div_id;
    parent.appendChild(in_div);
        var input = document.createElement("input"); input.type = 'text'; input.id = input_id; input.readOnly=true;
        in_div.appendChild(input);
        for (var i = 0;i < 10; i++){  // make buttons with numbers
            var btn = document.createElement ("button");
            if (i === 0 || i === 6) {
                var br = document.createElement("br");
                in_div.appendChild(br);
            }
            btn.innerHTML = i;
            btn.id = i;
            in_div.appendChild(btn);
            (function(index) {btn.onclick = function() {document.getElementById(input_id).value += index;};})(i);
        }
    for (var j = 0; j < operators.length; j++) {   // make buttons with operators
        var btn = document.createElement ("button");
        btn.innerHTML = operators[j];
        btn.id = operators[j];
        in_div.appendChild(btn);
        if (operators[j] === "=") {
            btn.onclick = function () {document.getElementById(input_id).value = eval(document.getElementById (input_id).value);};
        }
        else if (operators[j] === "c") {
            btn.onclick = function () {document.getElementById(input_id).value = '';};
        }
        else if (operators[j] === "DEL") {
            btn.onclick = function () {clearBox(div_id);};
        }
        else {
            (function(index) {btn.onclick = function() {document.getElementById(input_id).value += index;};})(operators[j]);
        }   
    };
};

function clearBox(elementID) // delete the selected instance of calc
{
    document.getElementById(elementID).innerHTML='';    
}  
}

I also use the turbolinks function in Rails. What could be the problem here?

New code;

$(document).ready(function() {initPage();});
window.on('page:change', function(){initPage();});
/*
$(function() {
    initPage();
});
$(window).bind('page:change', function() {
    initPage();
});
*/
function initPage() {
        var div = document.getElementById("buttons");
        var btn1 = document.createElement("button"); btn1.innerHTML = "Add one calculator"; btn1.id = "one";
        div.appendChild(btn1);
        btn1.onclick = function () {make_buttons ('calc');};
}
function make_buttons (id) {
    var div_id = Math.floor(Math.random()*999);
    var input_id = Math.floor(Math.random()*999);
    var operators = ["*","/","+","-","=","c","DEL"];
    var parent = document.getElementById(id);
    var in_div = document.createElement("div"); in_div.id = div_id;
    parent.appendChild(in_div);
        var input = document.createElement("input"); input.type = 'text'; input.id = input_id; input.readOnly=true;
        in_div.appendChild(input);
        for (var i = 0;i < 10; i++){  // make buttons with numbers
            var btn = document.createElement ("button");
            if (i === 0 || i === 6) {
                var br = document.createElement("br");
                in_div.appendChild(br);
            }
            btn.innerHTML = i;
            btn.id = i;
            in_div.appendChild(btn);
            (function(index) {btn.onclick = function() {document.getElementById(input_id).value += index;};})(i);
        }
    for (var j = 0; j < operators.length; j++) {   // make buttons with operators
        var btn = document.createElement ("button");
        btn.innerHTML = operators[j];
        btn.id = operators[j];
        in_div.appendChild(btn);
        if (operators[j] === "=") {
            btn.onclick = function () {document.getElementById(input_id).value = eval(document.getElementById (input_id).value);};
        }
        else if (operators[j] === "c") {
            btn.onclick = function () {document.getElementById(input_id).value = '';};
        }
        else if (operators[j] === "DEL") {
            btn.onclick = function () {clearBox(div_id);};
        }
        else {
            (function(index) {btn.onclick = function() {document.getElementById(input_id).value += index;};})(operators[j]);
        }   
    };
};

function clearBox(elementID) // delete the selected instance of calc
{
    document.getElementById(elementID).innerHTML='';    
}