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今天小编给大家分享一下JavaScript怎么验证API的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。
Property | Description |
---|---|
checkValidity() | Returns true if an input element contains valid data. |
setCustomValidity() | Sets the validationMessage property of an input element. |
如果输入字段包含无效数据,则显示一条消息:
<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. |
输入元素的有效性属性包含许多与数据有效性相关的属性:
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. |
如果输入字段中的数字大于 100(输入的max 属性),则显示一条消息:
rangeOverflow 属性
<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>
如果输入字段中的数字小于 100(输入的min属性),则显示一条消息:
rangeUnderflow 属性
<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怎么验证API”这篇文章的所有内容,感谢各位的阅读!相信大家阅读完这篇文章都有很大的收获,小编每天都会为大家更新不同的知识,如果还想学习更多的知识,请关注亿速云行业资讯频道。
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