• 周蓬安.blog的博客—强国博客—人民网 2019-05-10
  • 紫光阁中共中央国家机关工作委员会 2019-05-10
  • 感触名家笔下的端午文化吃香粽原来可以这样文艺 2019-05-09
  • 追梦夺冠游行嘲讽詹皇 百万人面前穿订制T恤羞辱他 2019-04-27
  • 《瘟疫传说》:黑死病恐怖 姐弟在绝望中求生 2019-04-10
  • 陕西国防工业职业技术学院百名大学生志愿者敬老院慰问孤寡老人陕西国防工业职业技术学院百名大学生志愿者敬老院慰问-陕西教育新闻 2019-04-08
  • 西藏拉萨:新家园 新生活 2019-04-08
  • 尊重和保障宗教信仰自由的中国实践 2019-04-06
  • 一敬泯恩仇 俄罗斯队主帅这个动作太暖了 2019-03-20
  • 四大名著剧组首次同台忆往事 经典影视剧如何铸就? 2018-12-07
  • “天眼”凝望 探秘宇宙 2018-12-07
  • 0

    JavaScript 事件

    Posted by 撒得一地 on 2016年5月29日 in JavaScript教程
    国外稳定加速器推荐    Express | Vypr

    事件是什么?

    HTML 与 JavaScript 的的相互作用,是通过用户或浏览器操作页面时出现的事件来进行处理的。

    页面加载时,它被称为一个事件。当用户点击一个按钮时,点击也是一个事件。其他例子包括像按任何键,关闭窗口,调整窗口等也是事件。

    开发人员可以使用这些事件来执行 JavaScript 编码响应,将点击按钮、关闭窗口、数据验证和几乎任何其他可以想象的响应类型等消息显示给用户。

    事件是文档对象模型 (DOM) 级别3 的一部分,每个 HTML 元素包含一组可以触发 JavaScript 代码的事件。

    为了更好地理解 HTML 事件,在这里我们将会看到几个示例,以了解事件和 JavaScript 的关系:

    onclick 事件类型

    这是最常用的事件类型,当用户单击鼠标左边的按钮时触发。你可以对此事件发生时进行验证、警告等。

    示例

    请尝试下面的示例。

    <html>
       <head>
          
          <script type="text/javascript">
             <!--
                function sayHello() {
                   alert("Hello World")
                }
             //-->
          </script>
          
       </head>
       
       <body>
          <p>Click the following button and see result</p>
          
          <form>
             <input type="button" onclick="sayHello()" value="Say Hello" />
          </form>
          
       </body>
    </html>
    

    亲自试一试

    onsubmit 事件类型

    onsubmit 是当你尝试提交表单时出现的事件。你可以通过这种事件类型对你提交的表单进行验证。

    示例

    下面的示例演示如何使用 onsubmit。在将数据提交到 web 服务器之前,我们先调用 validate() 验证函数。如果 validate() 函数返回 true,则提交表单,否则它不会提交表单的数据。

    <html>
       <head>
       
          <script type="text/javascript">
             <!--
                function validation() {
                   all validation goes here
                   .........
                   return either true or false
                }
             //-->
          </script>
          
       </head>
       <body>
       
          <form method="POST" action="t.cgi" onsubmit="return validate()">
             .......
             <input type="submit" value="Submit" />
          </form>
          
       </body>
    </html>
    

    onmouseover 和 onmouseout

    这两个事件类型将帮助您创建很好的效果,该效果基于图像或文本等。onmouseover 是当你把你的鼠移到任何元素时进行事件触发,onmouseout 是当你将鼠标从某个元素移开时进行事件触发。请尝试下面的示例。

    <html>
       <head>
       
          <script type="text/javascript">
             <!--
                function over() {
                   document.write ("Mouse Over");
                }
                
                function out() {
                   document.write ("Mouse Out");
                }
                
             //-->
          </script>
          
       </head>
       <body>
          <p>Bring your mouse inside the division to see the result:</p>
          
          <div onmouseover="over()" onmouseout="out()">
             <h2> This is inside the division </h2>
          </div>
             
       </body>
    </html>
    

    亲自试一试

    HTML 5 标准事件

    这里列出了标准的 HTML5 事件供您参考。在这里 script 表明了执行具体某个 Javascript 函数来响应该事件。

    Attribute Value Description
    Offline script Triggers when the document goes offline
    Onabort script Triggers on an abort event
    onafterprint script Triggers after the document is printed
    onbeforeonload script Triggers before the document loads
    onbeforeprint script Triggers before the document is printed
    onblur script Triggers when the window loses focus
    oncanplay script Triggers when media can start play, but might has to stop for buffering
    oncanplaythrough script Triggers when media can be played to the end, without stopping for buffering
    onchange script Triggers when an element changes
    onclick script Triggers on a mouse click
    oncontextmenu script Triggers when a context menu is triggered
    ondblclick script Triggers on a mouse double-click
    ondrag script Triggers when an element is dragged
    ondragend script Triggers at the end of a drag operation
    ondragenter script Triggers when an element has been dragged to a valid drop target
    ondragleave script Triggers when an element is being dragged over a valid drop target
    ondragover script Triggers at the start of a drag operation
    ondragstart script Triggers at the start of a drag operation
    ondrop script Triggers when dragged element is being dropped
    ondurationchange script Triggers when the length of the media is changed
    onemptied script Triggers when a media resource element suddenly becomes empty.
    onended script Triggers when media has reach the end
    onerror script Triggers when an error occur
    onfocus script Triggers when the window gets focus
    onformchange script Triggers when a form changes
    onforminput script Triggers when a form gets user input
    onhaschange script Triggers when the document has change
    oninput script Triggers when an element gets user input
    oninvalid script Triggers when an element is invalid
    onkeydown script Triggers when a key is pressed
    onkeypress script Triggers when a key is pressed and released
    onkeyup script Triggers when a key is released
    onload script Triggers when the document loads
    onloadeddata script Triggers when media data is loaded
    onloadedmetadata script Triggers when the duration and other media data of a media element is loaded
    onloadstart script Triggers when the browser starts to load the media data
    onmessage script Triggers when the message is triggered
    onmousedown script Triggers when a mouse button is pressed
    onmousemove script Triggers when the mouse pointer moves
    onmouseout script Triggers when the mouse pointer moves out of an element
    onmouseover script Triggers when the mouse pointer moves over an element
    onmouseup script Triggers when a mouse button is released
    onmousewheel script Triggers when the mouse wheel is being rotated
    onoffline script Triggers when the document goes offline
    onoine script Triggers when the document comes online
    ononline script Triggers when the document comes online
    onpagehide script Triggers when the window is hidden
    onpageshow script Triggers when the window becomes visible
    onpause script Triggers when media data is paused
    onplay script Triggers when media data is going to start playing
    onplaying script Triggers when media data has start playing
    onpopstate script Triggers when the window's history changes
    onprogress script Triggers when the browser is fetching the media data
    onratechange script Triggers when the media data's playing rate has changed
    onreadystatechange script Triggers when the ready-state changes
    onredo script Triggers when the document performs a redo
    onresize script Triggers when the window is resized
    onscroll script Triggers when an element's scrollbar is being scrolled
    onseeked script Triggers when a media element's seeking attribute is no longer true, and the seeking has ended
    onseeking script Triggers when a media element's seeking attribute is true, and the seeking has begun
    onselect script Triggers when an element is selected
    onstalled script Triggers when there is an error in fetching media data
    onstorage script Triggers when a document loads
    onsubmit script Triggers when a form is submitted
    onsuspend script Triggers when the browser has been fetching media data, but stopped before the entire media file was fetched
    ontimeupdate script Triggers when media changes its playing position
    onundo script Triggers when a document performs an undo
    onunload script Triggers when the user leaves the document
    onvolumechange script Triggers when media changes the volume, also when volume is set to "mute"
    onwaiting script Triggers when media has stopped playing, but is expected to resume

    上一篇:

    下一篇:

    相关推荐

    发表评论

    电子邮件地址不会被公开。 必填项已用*标注

    6 + 1 = ?

    网站地图|广东快乐10分开奖直播

    Copyright © 2015-2019 广东快乐10分开奖直播 All rights reserved.
    闽ICP备15015576号-1,版权所有?psz.

  • 周蓬安.blog的博客—强国博客—人民网 2019-05-10
  • 紫光阁中共中央国家机关工作委员会 2019-05-10
  • 感触名家笔下的端午文化吃香粽原来可以这样文艺 2019-05-09
  • 追梦夺冠游行嘲讽詹皇 百万人面前穿订制T恤羞辱他 2019-04-27
  • 《瘟疫传说》:黑死病恐怖 姐弟在绝望中求生 2019-04-10
  • 陕西国防工业职业技术学院百名大学生志愿者敬老院慰问孤寡老人陕西国防工业职业技术学院百名大学生志愿者敬老院慰问-陕西教育新闻 2019-04-08
  • 西藏拉萨:新家园 新生活 2019-04-08
  • 尊重和保障宗教信仰自由的中国实践 2019-04-06
  • 一敬泯恩仇 俄罗斯队主帅这个动作太暖了 2019-03-20
  • 四大名著剧组首次同台忆往事 经典影视剧如何铸就? 2018-12-07
  • “天眼”凝望 探秘宇宙 2018-12-07
  • 北京赛车群二维码 北京赛车pk10官网 华彩网3d开机号 体彩p3试机号322 安卓彩票走势图 德州扑克在线游戏 超级大乐透开奖号码 排列三走势图带连线 高频彩单双 大星3d彩票走势图 360老时时彩4星技巧 4月1号3d彩票开奖结果 老时时彩大小单双 福彩3d开机号查询丶公益时报中华彩票网 庄闲和补牌规则表格 任选9场第11067期