Changing Style Sheet javascript

I got this HTML code:

<head>
    <script type="application/javascript" src="javascript.js">
    <link id="pagestyle" href="default.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <button id="stylesheet1" > Default Style Sheet </button>
    <button id="stylesheet2" > Dark Style Sheet </button>
</body>

And in javascript.js I got this:

function swapStyleSheet(sheet) {
    document.getElementById("pagestyle").setAttribute("href", sheet);  
}

function initate() {
    var style1 = document.getElementById("stylesheet1");
    var style2 = document.getElementById("stylesheet2");

    style1.onclick = swapStyleSheet("default".css);
    style2.onclick = swapStyleSheet("dark".css);
}

window.onload = initate;

I want to the style sheets to change while pressing this buttons. I can't figure out why it is not working.

Answers:

Answer

One guess would be the missing .css property, another would be the fact that onclick is not a function, but a result from invoking one:

Make all of .css a string and assign functions to onclick:

style1.onclick = function () { swapStyleSheet("default.css") };
style2.onclick = function () { swapStyleSheet("dark.css"); };
Answer

Transform "default".css into "default.css". Do the same for dark.css.

Then onclick takes a function as a value.

style1.onclick = function () { swapStyleSheet("default.css") };
style2.onclick = function () { swapStyleSheet("dark.css") }; 
Answer

Hello it Won't work until you add onclick="" property in html So the final version will look like this: html

<head>
    <script type="application/javascript" src="javascript.js">
    <link id="pagestyle" href="default.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <button id="stylesheet1" onclick="initate();"> Default Style Sheet </button>
    <button id="stylesheet2" onclick="onclick="initate();"> Dark Style Sheet </button>
</body>

Javascript file

function swapStyleSheet(sheet) {
    document.getElementById("pagestyle").setAttribute("href", sheet);  
}

function initate() {
    var style1 = document.getElementById("stylesheet1");
    var style2 = document.getElementById("stylesheet2");

    style1.onclick = swapStyleSheet("default.css");
    style2.onclick = swapStyleSheet("dark.css");
}

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