knockout.js - Knockout Js Regex no negative numbers -
i'm trying find regex code disable negative numbers user input. i'm playing around code abit trying find right 1 haven't had success.
my current code is:
price: ko.observable().extend({ required: true, pattern: '^[0-9].$' })
in such case, why need allow user enter minus numbers in input field , validate input against negative number?
instead can prevent user entering negative numbers/strings.
this uses javascript, don't have write own validation routine. instead check validity.valid property. true if , if input falls within range.
solution 1:
<html> <body> <form action="#"> <input type="number" name="test" min=0 oninput="validity.valid||(value='');"> </form> </body> </html>solution 2:
the below solution supports validate multiple inputs.
// select input element. var numinput = document.queryselector('input'); // listen input event on numinput. numinput.addeventlistener('input', function(){ // let's match digits. var num = this.value.match(/^\d+$/); if (num === null) { // if have no match, value empty. this.value = ""; } }, false)<input type="number" min="0" />solution 3:
i haven't tested below solution, might well...
either '/^\d+$/' or '^\d+$' pattern may along current approach.
price: ko.observable().extend({ required: true, pattern: '/^\d+$/' }) original solution , reference here..
hope helps...
Comments
Post a Comment