# Design

Rules that help you discover design issues.
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## NoInlineScript

Since: PMD 4.0

Priority: Medium (3)

Avoid inlining HTML script content. Consider externalizing the HTML script using the ‘src’ attribute on the "script" element. Externalized script could be reused between pages. Browsers can also cache the script, reducing overall download bandwidth.

This rule is defined by the following XPath expression:

    //HtmlScript[@Image != '']

Use this rule by referencing it:

    <rule ref="category/jsp/design.xml/NoInlineScript" />

## NoInlineStyleInformation

Since: PMD 3.6

Priority: Medium (3)

Style information should be put in CSS files, not in JSPs. Therefore, don’t use <B> or <FONT> tags, or attributes like "align=’center’".

This rule is defined by the following Java class: net.sourceforge.pmd.lang.jsp.rule.design.NoInlineStyleInformationRule

Example(s):

    <html><body><p align='center'><b>text</b></p></body></html>

Use this rule by referencing it:

    <rule ref="category/jsp/design.xml/NoInlineStyleInformation" />

## NoLongScripts

Since: PMD 3.6

Priority: Medium High (2)

Scripts should be part of Tag Libraries, rather than part of JSP pages.

This rule is defined by the following XPath expression:

    //HtmlScript[(@EndLine - @BeginLine > 10)]

Example(s):

    <HTML>
    <BODY>
    <!--Java Script-->
    <SCRIPT language="JavaScript" type="text/javascript">
    <!--
    function calcDays(){
      var date1 = document.getElementById('d1').lastChild.data;
      var date2 = document.getElementById('d2').lastChild.data;
      date1 = date1.split("-");
      date2 = date2.split("-");
      var sDate = new Date(date1[0]+"/"+date1[1]+"/"+date1[2]);
      var eDate = new Date(date2[0]+"/"+date2[1]+"/"+date2[2]);
      var daysApart = Math.abs(Math.round((sDate-eDate)/86400000));
      document.getElementById('diffDays').lastChild.data = daysApart;
    }

    onload=calcDays;
    //-->
    </SCRIPT>
    </BODY>
    </HTML>

Use this rule by referencing it:

    <rule ref="category/jsp/design.xml/NoLongScripts" />

## NoScriptlets

Since: PMD 3.6

Priority: Medium (3)

Scriptlets should be factored into Tag Libraries or JSP declarations, rather than being part of JSP pages.

This rule is defined by the following XPath expression:

    //JspScriptlet
    |
    //Element[ upper-case(@Name)="JSP:SCRIPTLET" ]

Example(s):

    <HTML>
    <HEAD>
    <%
    response.setHeader("Pragma", "No-cache");
    %>
    </HEAD>
        <BODY>
            <jsp:scriptlet>String title = "Hello world!";</jsp:scriptlet>
        </BODY>
    </HTML>

Use this rule by referencing it:

    <rule ref="category/jsp/design.xml/NoScriptlets" />