oninvalidイベント
定義と使用方法
送信可能な<input>要素が無効な場合、oninvalidイベントが発生します。
例えば、required属性が設定されており、フィールドが空の場合、入力フィールドは無効です（required属性は入力フィールドがフォームを提出する前に必ず入力される必要があることを指定しています）。
Instance
Example 1
If the input field is invalid, prompt some text:
<input type="text" oninvalid="alert('You must fill out the form!');" required>
More TIY examples are available at the bottom of the page.
Syntax
In HTML:
<element oninvalid="myScript">
In JavaScript:
object.oninvalid = function(){myScript};
In JavaScript, use the addEventListener() method:
object.addEventListener("invalid", myScript);
Note:Internet Explorer 8 or earlier versions do not support addEventListener() method.
Technical details
| Bubble: | Not supported |
|---|---|
| Cancelable: | Support |
| Event type: | Event |
| Supported HTML tags: | <input> |
| DOM version: | Level 3 Events |
Browser support
The numbers in the table indicate the first browser version that fully supports the event.
| Event | Chrome | IE | Firefox | Safari | Opera |
|---|---|---|---|---|---|
| oninvalid | Support | 10.0 | Support | Support | Support |
More examples
Example 2
If the input field contains fewer than 6 characters, prompt some text:
Name: <input type="text" id="myInput" name="fname" pattern=".{6,}" required>
<script>
document.getElementById("myInput").addEventListener("invalid", myFunction);
function myFunction() {
alert("Must contain 6 or more characters");
}
</script>
Example 3
If the input field contains a number less than 2 or greater than 5, prompt some text:
Number: <input type="number" id="myInput" name="quantity" min="2" max="5" required>
<script>
document.getElementById("myInput").addEventListener("invalid", myFunction);
function myFunction() {
alert("2から5の間の数字を選んでください。あなたが選んだのは: " + this.value);
}
</script>
