Operators inside input field

Question

I have a function that doesnt work if i write an operator inside the input field.
Ex
<Input type = "number" id= number>
Now i wrote a function on click called calculate
<Script>
Function calculate {
var number = document.getElemntById("number").value;
alert (number);
}
</script>

The function works if i write a number inside the input field but it doesnt work when i write an operator inside the input field. I want to calculate the value of the input value and alert it
Ex
3+3 output 6

Answer 1

You could use the eval function:

var number = eval(document.getElementById("number").value);
alert(number);

Though I'd advise against using it for reasons stated here (also alternate methods are provided):

https://stackoverflow.com/questions/86513/why-is-using-the-javascript-eval-function-a-bad-idea

Answer 2

Ok, sorry it took a while but here you go:

https://code.sololearn.com/WG37L0Nt9QTT/?ref=app

Answer 3

Eval was working in the beginning but when i tried to divide 2 diffrent variabels, eval doesnt work anymore. The script which is not working is
If ( v !="" && s != "" && t =="") {
t = eval(s)/eval(v)
document.getElementById("t").value = t;
}
This script doenst work with eval method. It works without using operators

Answer 4

Thank you for ur help but it is till not working when i write the script into my website. When i add operators into an input field the script will run the else statment instead of if statment. when i alert the value of numberV oe numberS after using operators the value is always undefined