Question

I am using an html form that submits data to a MYSQL database. I need to add a button that will increase the number in the text box by one every time pressed. My code looks like this:

<label for="htop">Top: </label>
<input type="button" name="decrease" value="-" /><input type="text" name="htop" value="0" />
<input type="button" name="increase" value="+" />

What is the best way to do this?

Answer 1

put the script tag in your head element

<script>
function increaseBtnOnclick() {
    document.getElementById("htop").value = Number(document.getElementById("htop").value) + 1;
}
</script>

<label for="htop">Top: </label>
<input type="button" name="decrease" value="-" /><input type="text" name="htop" value="0" id="htop"/>
<input type="button" name="increase" value="+" onclick="increaseBtnOnclick()"/>