In web pages, buttons are divided into three types: ordinary button button, submit button, and reset button.
1. Ordinary button button
Ordinary buttons generally need to be cooperated with JavaScript scripts to implement the form.
Syntax:
<input type="button" value="普通按钮的取值" onclick="JavaScript脚本程序"/>
Description:
The value of value is the text displayed on the button, onclick is the event of the ordinary button, we will cover this in the JavaScript introductory tutorial Detailed explanation, it’s OK for everyone to understand it here.
Example:
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> </head> <body> 单击按钮弹出对话框:<br/> <input type="button" value="按钮" onclick="alert('你点击了按钮!')"> </body> </html>
2. Submit button submit
The submit button can be regarded as an ordinary button with special functions. Clicking the submit button can submit the form content to Server processing.
Syntax:
<input type="submit" value="提交按钮的取值"/>
Description: The value of
value is the text displayed on the button. See the example in Reset Button for an example.
The real usefulness of the submit button cannot be truly understood until we learn back-end technology.
3. Reset button reset
The reset button can also be regarded as an ordinary button with special functions. Clicking the reset button can clear the information entered by the user in the page form.
Syntax:
<input type="reset" value="重置按钮的取值"/>
Description: The value of
value is the text displayed on the button.
Example:
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> </head> <body> <form name="form1" method="post" action="index.html"> 账号:<input type="text"/><br/> 密码:<input type="text"/><br/> <input type="submit" value="提交"/> <input type="reset" value="重置"/> </form> </body> </html>
After you enter characters in the text box and press the reset button, you will find that the content of the text box is cleared! This is what the reset button does.
1. Misunderstanding of the reset button
We know from the above that the reset button can clear the information entered by the user in the form, but the reset button can only clear the "current form tag" The content of the form element is invalid for form elements outside the current form tag.
Example:
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> </head> <body> <form name="form1" method="post" action="index.html"> 账号:<input type="text"/><br/> 密码:<input type="text"/><br/> <input type="submit" value="提交"/> <input type="reset" value="重置"/> </form> 昵称:<input type="text"/><br/> </body> </html>
Then if you enter information in the text box outside the
The above is the detailed content of Usage of html tag

本篇文章带大家了解一下HTML(超文本标记语言),介绍一下HTML的本质,HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单,希望对大家有所帮助!

在html中,可以使用width和height属性来设置button元素的大小,使用background-color属性来设置button元素的颜色,具体语法为“button{width:宽度值;height:高度值;background-color: 颜色值;}”。

总结了一些web前端面试(笔试)题分享给大家,本篇文章就先给大家分享HTML部分的笔试题(附答案),大家可以自己做做,看看能答对几个!

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

在html中,document是文档对象的意思,代表浏览器窗口的文档;document对象是window对象的子对象,所以可通过“window.document”属性对其进行访问,每个载入浏览器的HTML文档都会成为Document对象。

html5支持boolean值属性;boolean值属性指是属性值为true或者false的属性,如input元素中的disabled属性,不使用该属性表示值为flase,不禁用元素,使用该属性可以不设置属性值表示值为true,禁用元素。


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