输入框只接受 0 和 1

Question

I want to accept only 0 and 1 in input field and add spaces after every 4 digits. With the following I can add spaces but it accepts all digits. How can I restrict it to only 0 and 1 instead of all digits? I'm having difficulty in the pattern.

document.getElementById('num').addEventListener('input', function (e) {
  e.target.value = e.target.value.replace(/[^\d]/g, '').replace(/(.{4})/g, '$1 ').trim();
});

Demo: https://jsfiddle.net/5rvfgpzo/

Answer 1

You can try this:

 document.getElementById('num').addEventListener('input', function (e) { e.target.value = e.target.value.replace(/[^0-1]/g, '').replace(/(.{4})/g, '$1 ').trim(); });

 input { width: 200px; padding: 5px; }

 <label for="num">num</label> <input id="num" type="text" min="0" max="1" name="num" maxlength="14" />

Answer 2

I want to accept only 0 and 1 in input field and add spaces after every 4 digits. With the following I can add spaces but it accepts all digits. How can I restrict it to only 0 and 1 instead of all digits? I'm having difficulty in the pattern.

document.getElementById('num').addEventListener('input', function (e) {
  e.target.value = e.target.value.replace(/[^\d]/g, '').replace(/(.{4})/g, '$1 ').trim();
});

Demo: https://jsfiddle.net/5rvfgpzo/