无法通过使用request.getparameter获取值 [英] not getting the values by using request.getparameter

问题描述

在单击submit时，我调用此函数:

On click submit I call this function:

function submitFunction()
{

    document.forms[0].action = "Result.jsp";

    document.forms[0].method = 'GET';

    document.forms[0].submit();

}

Result.jsp中的数据是:

<%
out.println(request.getparameter("demo1")+"<BR>");
out.println(request.getparameter("demo2")+"<BR>");
out.println(request.getparameter("demo3")+"<BR>");
out.println(request.getParameter("demo4")+"<BR>");  
out.println(request.getParameter("demo5")+"<BR>");
out.println(request.getParameter("demo6")+"<BR>");
%>

我的表格:

<form method="post" action="Result.jsp" >
    <h1>Student Info</h1>
    <hr>
    <pre>
        <b>Name</b> :<input id="demo1" type="text" value=" "/>
    </pre>
    <pre>
        <b>Age </b> :<input id="demo2" type="text" value=" "/>
    </pre>
    <pre>
        <b>Qualification</b> :<input id="demo3" type=isNaN value=" "/>
    </pre>
    <pre>
        <b>Address</b> :<input id="demo4" type="text" value=" "/>
    </pre>
    <pre>
        <b>Company Name</b> :<input id="demo5" type="text" value=" "/>
    </pre>
    <pre>
        <b>Height</b> :<input id="demo6" type="numeric" value=" " />
    </pre>
</form>

请为此提出建议

推荐答案

您应该在HTML <form>的<input>标记中使用属性name而不是id:

You should use the attribute name instead of id in your html <form>'s <input> tag:

代替:

<input id="demo1" type="text" value=" "/>

使用:

<input id="demo1" name="demo1" type="text" value=" "/>

注意name="demo1".由于作为请求参数发送到服务器的键值请求对是<input>的name-value对，即request.getParameter("demo1")通过name&不是id.

Notice the name="demo1". Since the key-value request pair sent to the server as request parameter is the name-value pair of the <input> i.e. request.getParameter("demo1") identifies the parameters through name & not id.

此外，您可以使用CSS或内联样式来设置html标签(如<input>，<form>等)的样式，而不是使用<pre>标签. <pre>标记通常用于显示代码或预先格式化的用户内容.

Also as a side-note, you can use CSS or inline-styles to style your html tags like <input>, <form> etc, rather than using the <pre> tag. The <pre> tag is generally used for displaying code or preformatted user-content.

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