i made the script that reverses the numbers but i dont know how to make the alert pop up the result of the reversed numbers I need help to figure this out it probably has a simple solution but i dont know
The code added to snippet is below:
function okreni () { // removed "s" parameter
var a = ' ';
// s = s.toString();
const s = document.getElementById("broj").value.toString();
for (var i = s.length - 1; i>=0; i--) {
a += s[i];
}
window.alert (a);
};<body>
<label for="broj">Unesite Broj:</label>
<input type="number" name="broj" id="broj" value="">
<div>
<button value="okreni" onclick="okreni()">Okreni</button>
</div>
</body>EDIT -
The s = s.toString() has been changed to get the information from the input-value.
alert doesn't display if there's no value to display. in your case you have to passe a value to "okreni()" function.
<button value="okreni" onclick="okreni(**value**)">Okreni</button>
Apparently, you suppose to get the input value as s in okreni(s). However, this is not possible. You have to get the value programatically from the input. Following the working code. I've also created this CodeSandbox for you to try it out:
<!DOCTYPE html>
<html>
<head>`enter code here`
<title>Parcel Sandbox</title>
<meta charset="UTF-8" />
</head>
<body>
<label for="broj">Unesite Broj:</label>
<input type="number" name="broj" id="broj" value="" />
<div>
<button value="okreni" onclick="okreni()">Okreni</button>
</div>
<script type="text/javascript">
function okreni() {
var a = " ";
let inputValue = document.querySelector("#broj").value;
const s = inputValue.toString();
for (var i = s.length - 1; i >= 0; i--) {
a += s[i];
}
window.alert(a);
}
</script>
</body>
</html>
You could also try something like this to reverse your string. In looks much cleaner in my opinion and can even be condensed to a single line if needed.
Apart from that, the reason you are getting an error is because of what alexanderdavide mentioned in his answer. To elaborate further, the okreni function does not require a parameter to be passed. Instead, within the fucntion we look for the value in the input element with the id of broj. So, when you click on the button, the function checks the string in that input, reverses it and then performs an alert.
function okreni() {
let s = document.getElementById('broj').value
s = s.split("").reverse().join("")
window.alert(s)
}<label for="broj">Unesite Broj:</label>
<input type="text" name="broj" id="broj" value="">
<div>
<button value="okreni" onclick="okreni()">Okreni</button>
</div>