您好,登錄后才能下訂單哦!
今天小編給大家分享一下JavaScript怎么驗證API的相關知識點,內容詳細,邏輯清晰,相信大部分人都還太了解這方面的知識,所以分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后有所收獲,下面我們一起來了解一下吧。
Property | Description |
---|---|
checkValidity() | Returns true if an input element contains valid data. |
setCustomValidity() | Sets the validationMessage property of an input element. |
如果輸入字段包含無效數據,則顯示一條消息:
<input id="id1" type="number" min="100" max="300" required><button onclick="myFunction()">OK</button><p id="demo"></p><script>function myFunction() { const inpObj = document.getElementById("id1"); if (!inpObj.checkValidity()) { document.getElementById("demo").innerHTML = inpObj.validationMessage; } }</script>
Property | Description |
---|---|
validity | Contains boolean properties related to the validity of an input element. |
validationMessage | Contains the message a browser will display when the validity is false. |
willValidate | Indicates if an input element will be validated. |
輸入元素的有效性屬性包含許多與數據有效性相關的屬性:
Property | Description |
---|---|
customError | Set to true, if a custom validity message is set. |
patternMismatch | Set to true, if an element's value does not match its pattern attribute. |
rangeOverflow | Set to true, if an element's value is greater than its max attribute. |
rangeUnderflow | Set to true, if an element's value is less than its min attribute. |
stepMismatch | Set to true, if an element's value is invalid per its step attribute. |
tooLong | Set to true, if an element's value exceeds its maxLength attribute. |
typeMismatch | Set to true, if an element's value is invalid per its type attribute. |
valueMissing | Set to true, if an element (with a required attribute) has no value. |
valid | Set to true, if an element's value is valid. |
如果輸入字段中的數字大于 100(輸入的max 屬性),則顯示一條消息:
rangeOverflow 屬性
<input id="id1" type="number" max="100"><button onclick="myFunction()">OK</button><p id="demo"></p><script>function myFunction() { let text = "Value OK"; if (document.getElementById("id1").validity.rangeOverflow) { text = "Value too large"; } }</script>
如果輸入字段中的數字小于 100(輸入的min屬性),則顯示一條消息:
rangeUnderflow 屬性
<input id="id1" type="number" min="100"><button onclick="myFunction()">OK</button><p id="demo"></p><script>function myFunction() { let text = = "Value OK"; if (document.getElementById("id1").validity.rangeUnderflow) { text = "Value too small"; } }</script>
以上就是“JavaScript怎么驗證API”這篇文章的所有內容,感謝各位的閱讀!相信大家閱讀完這篇文章都有很大的收獲,小編每天都會為大家更新不同的知識,如果還想學習更多的知識,請關注億速云行業資訊頻道。
免責聲明:本站發布的內容(圖片、視頻和文字)以原創、轉載和分享為主,文章觀點不代表本網站立場,如果涉及侵權請聯系站長郵箱:is@yisu.com進行舉報,并提供相關證據,一經查實,將立刻刪除涉嫌侵權內容。