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<P>HTML表单(Form)是HTML的一个重要部分,主要用于采集和提交用户输入的信息。</P><P>举个简单的例子,一个让用户输入姓名的HTML表单(Form)。示例代码如下:</P><PRE>&lt;form action="http://www.blabla.cn/asdocs/html_tutorials/yourname.asp" method="get"&gt;</PRE><PRE>请输入你的姓名:</PRE><PRE>&lt;input type="text" name="yourname"&gt;</PRE><PRE>&lt;input type="submit" value="提交"&gt;</PRE><PRE>&lt;/form&gt;</PRE><P><A href="../html_examples/053_form_input_text.html">演示示例</A></P><P>学习HTML表单(Form)最关键要掌握的有三个要点:</P><UL><LI>表单控件(Form Controls) <LI>Action <LI>Method</LI></UL><P>先说表单控件(Form Controls),通过HTML表单的各种控件,用户可以输入文字信息,或者从选项中选择,以及做提交的操作。比如上面的例句里,input type= "text"就是一个表单控件,表示一个单行输入框。</P><P>用户填入表单的信息总是需要程序来进行处理,表单里的action就指明了处理表单信息的文件。比如上面例句里的http://www.blabla.cn/asdocs/html_tutorials/yourname.asp。</P><P>至于method,表示了发送表单信息的方式。method有两个值:get和post。get的方式是将表单控件的name/value信息经过编码之后,通过URL发送(你可以在地址栏里看到)。而post则将表单的内容通过http发送。那什么时候用get,什么时候用post呢?一般是这样来判断的,如果只是为取得和显示数据,用get;一旦涉及数据的保存和更新,那么建议用post。</P><H2>HTML表单(Form)常用控件(Controls)</H2><P>HTML表单(Form)常用控件有:</P><P><TABLE><TBODY><TR class=header><TD>表单控件(Form Contros)</TD><TD>说明</TD></TR><TR><TD>input type="text"</TD><TD>单行文本输入框</TD></TR><TR><TD>input type="submit"</TD><TD>将表单(Form)里的信息提交给表单里action所指向的文件</TD></TR><TR><TD>input type="checkbox"</TD><TD>复选框</TD></TR><TR><TD>input type="radio"</TD><TD>单选框</TD></TR><TR><TD>select</TD><TD>下拉框</TD></TR><TR><TD>textArea</TD><TD>多行文本输入框</TD></TR><TR><TD>input type="password"</TD><TD>密码输入框(输入的文字用*表示)</TD></TR></TBODY></TABLE></P><H3>表单控件(Form Control):单行文本输入框(input type="text")</H3><P>单行文本输入框允许用户输入一些简短的单行信息,比如用户姓名。例句如下:</P><PRE>&lt;input type="text" name="yourname"&gt;</PRE><P><A href="../html_examples/053_form_input_text.html">演示示例</A></P><H3>表单控件(Form Control):复选框(input type="checkbox")</H3><P>复选框允许用户在一组选项里,选择多个。示例代码:</P><PRE>&lt;input type="checkbox" name="fruit" value ="apple"&gt;苹果&lt;br&gt;</PRE><PRE>&lt;input type="checkbox" name="fruit" value ="orange"&gt;桔子&lt;br&gt;</PRE><PRE>&lt;input type="checkbox" name="fruit" value ="mango"&gt;芒果&lt;br&gt;</PRE><P><A href="../html_examples/055_form_input_check.html">演示示例</A></P><P>用checked表示缺省已选的选项。</P><PRE>&lt;input type="checkbox" name="fruit" value ="orange" checked&gt;桔子&lt;br&gt;</PRE><P><A href="../html_examples/056_form_input_check_checked.html">演示示例</A></P><H3>表单控件(Form Control):单选框(input type="radio")</H3><P>使用单选框,让用户在一组选项里只能选择一个。示例代码:</P><PRE>&lt;input type="radio" name="fruit" value = "Apple"&gt;苹果&lt;br&gt;</PRE><PRE>&lt;input type="radio" name="fruit" value = "Orange"&gt;桔子&lt;br&gt;</PRE><PRE>&lt;input type="radio" name="fruit" value = "Mango"&gt;芒果&lt;br&gt;</PRE><P><A href="../html_examples/057_form_input_radio.html">演示示例</A></P><P>用checked表示缺省已选的选项。</P><PRE>&lt;input type="radio" name="fruit" value = "Orange" checked&gt;桔子&lt;br&gt;</PRE><P><A href="../html_examples/058_form_input_radio_checked.html">演示示例</A></P><H3>表单控件(Form Control):下拉框(select)</H3><P>下拉框(Select)既可以用做单选,也可以用做复选。单选例句如下:</P><PRE>&lt;select name="fruit" &gt;</PRE><PRE>&nbsp; &lt;option value="apple"&gt;苹果</PRE><PRE>&nbsp; &lt;option value="orange"&gt;桔子</PRE><PRE>&nbsp; &lt;option value="mango"&gt;芒果</PRE><PRE>&lt;/select&gt;</PRE><P><A href="../html_examples/059_form_select_01.html">演示示例</A></P><P>如果要变成复选,加muiltiple即可。用户用Ctrl来实现多选。例句:</P><PRE>&lt;select name="fruit" multiple&gt;</PRE><P><A href="../html_examples/060_form_select_multiple.html">演示示例</A></P><P>用户还可以用size属性来改变下拉框(Select)的大小。</P><P><A href="../html_examples/061_form_select_multiple_size1.html">演示示例</A></P><H3>表单控件(Form Control):多行输入框(textarea)</H3><P>多行输入框(textarea)主要用于输入较长的文本信息。例句如下:</P><PRE>&lt;textarea name="yoursuggest" cols ="50" rows = "3"&gt;&lt;/textarea&gt;</PRE><P>其中cols表示textarea的宽度,rows表示textarea的高度。</P><P><A href="../html_examples/062_form_textarea.html">演示示例</A></P><H3>表单控件(Form Control):密码输入框(input type="password")</H3><P>密码输入框(input type="password")主要用于一些保密信息的输入,比如密码。因为用户输入的时候,显示的不是输入的内容,而是黑点符号。。例句如下:</P><PRE>&lt;input type="password" name="yourpw"&gt;</PRE><P><A href="../html_examples/054_form_input_text_password.html">演示示例</A></P><H3>表单控件(Form Control):提交(input type="submit")</H3><P>通过提交(input type=submit)可以将表单(Form)里的信息提交给表单里action所指向的文件。例句如下:</P><PRE>&lt;input type="submit" value="提交"&gt;</PRE><P><A href="../html_examples/053_form_input_text.html">演示示例</A></P><H3>表单控件(Form Control):图片提交(input type="image")</H3><P>input type=image 相当于 input type=submit,不同的是,input type=image 以一个图片作为表单的提交按钮,其中 src 属性表示图片的路径。</P><PRE>&lt;input type="image" src ="<A href="../images/icons/go.gif">http://www.blabla.cn/images/icons/go.gif</A>" </PRE><PRE>alt = "提交" NAME="imgsubmit"&gt;</PRE><P><a href = "../html_examples/064_form_input_image.html">演示示例</a></P><P>&nbsp;</P><P>&nbsp;</P>
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