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JavaScript
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<form id="myform"> <input type="text" id="amount" name="amount" placeholder="Enter a 4-digit number"> <button type="submit">Submit</button> </form>
document.addEventListener("DOMContentLoaded", () => { const $elMyform = document.getElementById("myform"); const $elAmount = document.getElementById("amount"); $elAmount.pattern = "[0-9]{4}"; $elMyform.addEventListener("submit", e => { e.preventDefault(); }, { passive: false }); });
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by DevDic
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