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[英]How to prevent JavaScript form.submit() from ignoring required fields
[英]How to prevent function call on submit form if required fields are not filled out?
我有需要輸入的表單,它實際上看到空字段並顯示消息,但它從提交按鈕調用函數
<form action="">
<input required id="1" type="text">
<button type="submit" onclick="calculate()">Calculate</button>
</form>
無論何時單擊按鈕, onclick
偵聽器都會運行。
您希望該函數僅在表單開始提交時運行,因此將submit
偵聽器附加到表單:
<form action="" onsubmit="calculate()">
<input required id="1" type="text">
<button type="submit">Calculate</button>
</form>
const calculate = (e) => { console.log('calculating'); }
<form action="" onsubmit="calculate()"> <input required id="1" type="text"> <button type="submit">Calculate</button> </form>
如果可能的話,最好使用 Javascript 而不是內聯 HTML 屬性正確附加事件偵聽器:
document.querySelector('form').addEventListener('submit', calculate);
const calculate = (e) => { e.preventDefault(); console.log('calculating'); }; document.querySelector('form').addEventListener('submit', calculate);
<form action=""> <input required id="1" type="text"> <button type="submit">Calculate</button> </form>
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