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HTML DOM

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HTML 对象

<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <tbody> <td> <tfoot> <th> <thead> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

其他参考手册

CSSStyleDeclaration JS 类型转换


Input Time required 属性

❮ Input Time 对象

实例

查看是否必须在提交表单之前填写时间字段:

var x = document.getElementById("myTime").required;
亲自试一试 »

定义和用法

required 必填属性设置或返回是否必须在提交表单之前填写时间字段。

此属性反映 HTML 必需的属性。


浏览器支持

属性
required Yes 10.0 Yes Yes Yes

注释: <input type="time"> 元素在 Firefox 中不显示为任何时间字段。


语法

返回 required 属性:

timeObject.required

设置 required 属性:

timeObject.required = true|false

属性值

描述
true|false 指定时间字段是否应该是表单提交的必需部分。
  • true - 时间字段是表单提交的必填部分
  • false - 默认值。 时间字段不是表单提交的必填部分

技术细节

返回值: 一个布尔值,如果时间字段是表单提交的必填部分,则返回true,否则返回false

更多实例

实例

将时间字段设置为表单提交的必填部分:

document.getElementById("myTime").required = true;
亲自试一试 »

相关页面

HTML 参考手册: HTML <input> required 属性


❮ Input Time 对象