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(yàn)證API的相關(guān)知識(shí)點(diǎn),內(nèi)容詳細(xì),邏輯清晰,相信大部分人都還太了解這方面的知識(shí),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(shù)據(jù),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(shù)據(jù)有效性相關(guān)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(shù)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(shù)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(yàn)證API”這篇文章的所有內(nèi)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(huì)為大家更新不同的知識(shí),如果還想學(xué)習(xí)更多的知識(shí),請(qǐng)關(guān)注億速云行業(yè)資訊頻道。
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場,如果涉及侵權(quán)請(qǐng)聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。