How to restrict your input field just to take the number?
If you want an input in your form that you will only take the number in that input, no alphabet or any symbol, you can use it.
oninput="this.value = !!this.value && Math.abs(this.value) >= 0 ? Math.abs(this.value) : null"This code should be placed on your input, which will only take the number value in the input.
It would look like something like that.
<input type="number" id="numberField" name="numberField" value="" oninput="this.value = !!this.value && Math.abs(this.value) >= 0 ? Math.abs(this.value) : null">