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What does the html applet tag mean? Detailed explanation of the usage of html applet tag

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Release： 2018-08-18 17:16:38
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html What does the applet tag mean? Detailed explanation of the usage of html applet tag. Let’s start with the content of this article. It mainly introduces the definition and specific usage of html applet tag, as well as the attribute function of HTML applet tag

html Definition and usage of applet tag:

The element is deprecated in HTML 4.01. The

tag defines the embedded applet.

html applet tag required attributes:

code: URL: Specifies the file name of the Java applet.

object : name : Defines the resource name that contains a series of versions of the applet.

HTML tag example:

An embedded Java applet:

<applet code="Bubbles.class" width="350" height="350">
Java applet that draws animated bubbles.
</applet>
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Optional attributes of the html applet tag:

What does the html applet tag mean? Detailed explanation of the usage of html applet tag

Although w3c does not recommend the use of applet, it is a recommended common practice to use applet to deploy applet in the intranet (Intranet), so first Let's discuss the use of the tag.

html Use of applet tags:

It is a very common practice to use the tag when deploying applets in the early stage. All attributes of the applet tag The list can be found here, //m.sbmmt.com, where detailed instructions are given.

1. Here is an example of using an applet: 

<applet code=Applet1.class width="200"    style="max-width:90%">
Your browser does not support the <code>applet</code> tag.
</applet>
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Generally we mainly use these attributes:

code Attribute refers to the applet class, which is a subclass that inherits the java.applet.Applet or java.swing.JApplet class. The value of this attribute must be the path where you store the applet class;

width attribute refers to the width that your applet will occupy in the browser

height attributerefers to the height that your applet will occupy in the browser

2. Generally we use these attributes, but sometimes we package the applet into a jar file, then we have to use the archive attribute, such as: 

<applet code=package.Applet1.class archive="app.jar" width="200" height="200">
Your browser does not support the <code>applet</code> tag.
</applet>
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In this example Meaning, search for the applet class package.Applet1.class in the app.jar file in the file where you store the HTML file. If you want to use multiple jar files, separate the jars with English encoding commas in the archive attribute value. file, that's it.

3. Sometimes we may want to load a file that is no longer in the current directory, but in its subdirectory or superior directory. In this case, we can use the codebase attribute, for example: 

<applet code=Applet1.class codebase="app" width="200" height="200">
Your browser does not support the <code>applet</code> tag.
</applet>
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This way The Java plug-in will search in the app subdirectory in the current directory and load the Applet1.class class.

4. We can also pass parameters to the applet class through it, such as: 

<applet code=Applet1.class codebase="app" width="200" height="200">
<param name="param1" value="1"/>
<param name="param2" value="2"/>
Your browser does not support the <code>applet</code> tag.
</applet>
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In this way, we can get these parameters through the getParameter(String param) method in the applet we wrote, This allows us to configure the purpose of the program in the applet tag, and the parameter name passed in is the name attribute value of our param tag.

html Introduction to the attributes of the applet tag:

1. The classid attribute

indicates the smallest Java plug-in to be used Version number, which means that the version of the currently installed Java plug-in must be greater than the classid, otherwise the applet cannot run. The classid attribute value usually used in Internet Explorer is fixed, that is: 

classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
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This format indicates using the latest jre version in IE.

classid also has another format, as follows: 

classid="clsid:CAFEEFAC-xxxx-yyyy-zzzz-ABCDEFFEDCBA"
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xxxx-yyyy-zzzz is the version number of the Java plug-in, such as version 1.6.0, it can be expressed as: 

classid="clsid:CAFEEFAC-0016-0000-0000-ABCDEFFEDCBA"
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2.width, height attributes

are the same as applet and will not be introduced here

3.codebase is an optional attribute. It has the following functions:

The version of JRE (Java Runtime Environment) installed on this machine is smaller than the version specified by the classid attribute. The browser will download and install jre from this URL.

The codebase has the following format: 

codebase=<URL>
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In this format, if the locally installed jre version is not the version specified by classid, then go to the specified url, download and install

codebase=<URL>#Version=major,minor,micro,undate
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In this format, if the jre version installed on the local machine is smaller than the one specified in the classid, go to the specified url to download jre

Note: These are separated by English commas.

Sun company is used here to download files (.cab format) specifically for each version of the installation file under the Windows platform.

Note: The tag is not supported in HTML5. Please use the object element tag instead.

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