CODEWITHSUNDEEP
javascripthtmlcss
JRse
JRse

Reputation: 93

How to use the result from a <script> function and assign it to style in html [for top & left positioning]

Since CSS can't handle sine or cosine calculations, I am using Math.sin and Math.cos inside a <script> element in my HTML. I'm trying to use the results to position left and top. There just doesn't seem to be an easy solution. My code below works, but I can't use the results in a style element to position left or top.

<p id="GetHeight"></p>
<script>
    function myCosFunction(b, angle) {
        return Math.cos(angle*Math.PI / 180)*b;
    }
    document.getElementById("GetHeight").innerHTML = myCosFunction(240, 18);
</script>

Upvotes: 1

Views: 278

Answers (2)

Zeeshan Ahmad Khalil
Zeeshan Ahmad Khalil

Reputation: 861

The other easy way to use the value from script in CSS is giving the innerHTML to style element using JS as follows; 

var size=parseInt(myCosFunction(80, 7));
document.getElementById('style').innerHTML="#box{margin-top:"+
                                            size+"px;margin-left:"+ 
                                   size+"px;height:100px;width:100px;background:red}";
function myCosFunction(b, angle) {
  return Math.cos(angle*Math.PI / 180)*b;
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style id="style">
    </style>
</head>
<body>
    <div id="box">
        Me
    </div>
</body>
<script src="js_function.js"></script>
</html>

Note: I have converted the value to int because the value used in CSS properties should be discrete.

Update:

If you want to get margin-top and margin-left of box form a sin function then you can simply call the function for two times using two variables that is X and Y. Then you can change the parameters of calling function to get different values of X and Y;

var Y=parseInt(mySinFunction(280, 7));
var X=parseInt(mySinFunction(300, 7));
document.getElementById('style').innerHTML="#box{margin-top:"+
                                            Y+"px;margin-left:"+ 
                                   X+"px;height:100px;width:100px;background:red}";
function myCosFunction(b, angle) {
  return Math.cos(angle*Math.PI / 180)*b;
}
function mySinFunction(b, angle) {
    return Math.sin(angle*Math.PI / 180)*b;
  }
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style id="style">
    </style>
</head>
<body>
    <div id="box">
        Me
    </div>
</body>
<script src="sin_fun.js"></script>
</html>

Upvotes: 1

Nisharg Shah
Nisharg Shah

Reputation: 19562

You can use positioning like that

For apply left CSS in GetHeight id

document.getElementById("GetHeight").style.left = myCosFunction(240, 18);

same as for top

document.getElementById("GetHeight").style.top = myCosFunction(240, 18);

Upvotes: 1

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