How to allow numbers and period only using js ?

There are several issues with the code.

1. The keyCode 32 is for space. The period sign is either 110 or 190. You can reference to JavaScript Event KeyCodes[^] to find out the correct key code for each keyboard character.

2. For comparison operator use == , = is for assignment, you can learn more from JavaScript Operators[^]

3. The logical operator is wrong (&&), (Logical AND) Returns true if both logical operands are true. Otherwise, returns false.

4. You might need to add extra logic to prevent user from entering many periods, like 1...2

<input id="test" type="text" 
    onkeydown="return (!(event.keyCode >= 65) || event.keyCode == 110 || event.keyCode == 190);" />