自动复制文本框中的数据

Question

When loaded data in textbox and I want auto copy this data in textbox then will paste to another textbox. Below is my script, but it is not reach as my request.

var stringValue = document.getElementById("Price").value;

    document.getElementById("Price").onkeyup = function ()
    {
        window.onload = function () {
            document.getElementById("copy_Price").value = stringValue + this.value.split('').reverse().join('').replace(/\d\d\d(?!$)/g, "$&,").split('').reverse().join('');
        };
        

    };

Answer 1

I think you want to copy entered data from the first element to next element on every keyUp events!

so this is the elements

<input type="text" id="Price" />
<input type="text" id="copy_Price"/>

and the correct script described in bellow

<script>   
    document.getElementById("Price").onkeyup = function ()
    {
        var stringValue = document.getElementById("Price").value;
        document.getElementById("copy_Price").value = stringValue;
    }
</script>