I am trying to add validation for input type number to accept only integer. I added pattern="\\d*"
to the element. It works fine for input 10.12
, 10.13
. But fails for input 10.
I printed the value for the html input. It is 10
instead of 10.
.
<script>
function getValue(){
alert(document.getElementById("numberInput").value);
}
</script>
<input type="number" id="numberInput"> </input>
<button onclick="getValue();">
Ideally it should consider 10.
as invalid input.
Pasting is indeed tricky. I came up with the following:
function setValid(target) { const val = target.value; // Remove value, as setting the same value has no effect. target.value = ''; // Reset value on the next tick requestAnimationFrame(() => target.value = val); }
<form action="#" method="post"> Numbers: <input name="num" type="number" min="1" step="1" onblur="setValid(this)" onpaste="requestAnimationFrame( () => setValid(this) )" onkeypress="return event.charCode >= 48 && event.charCode <= 57" title="Numbers only"> <input type="submit"> </form>
What this does is the following:
There are probably even better solutions out there.
This answer is based on kneeki's answer here .
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.