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From: Rik Kabel via ntg-context <ntg-context@ntg.nl>
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Subject: Re: Use section custom value in a header text.
Date: Tue, 20 Dec 2022 15:48:39 -0500
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On 2022-12-20 14:31, Pawel Urbanski via ntg-context wrote:
> Hi,
> Let me clarify my question more...
> I need to attach some value to a chapter in that key. That custom 
> prefix + the value in the key is ment to be in the header or a footer 
> as a matter of fact. The case can apply to both headers and footers.
> I tried:
> \chapter[title={A sample title}][custom_random={custom_value}]
> \setupheadertexts[{Prefix: \structureuservariable{custom_random}}]
> ...
> \stopchapter
> I tried this code when trying to figure out the mechanism. The prefix 
> string in placed in the header, but hte custom value of the attached 
> key is not expanded..
> Evey page will contain just one section started by a \startchapter and 
> \stop chapter. I would like to put this custom attached value in the 
> right slot in the document header.
>
> I hope that htis time around htigs are more clear.
>
> On Tue, Dec 20, 2022 at 8:13 PM Henning Hraban Ramm via ntg-context 
> <ntg-context@ntg.nl> wrote:
>
>     Am 20.12.22 um 19:44 schrieb Pawel Urbanski via ntg-context:
>     > Dear Friends,
>     > I s-- pent some time searching and coding simple documents, but
>     failed and
>     > therefore I'm asking for help...
>     > A section such as chapter cn have custom keys with values. One
>     uses the:
>     > \structureuservariable command to access such values.
>     > How can I use such a value to create a custom header in a format:
>     > Prefix: \structureuservariable{foo}
>     >
>     > I am asking for the only thing that worked when I tried was
>     calling the:
>     > \setupheadertexts command inside a chapter environment block
>     with some
>     > prefix. Unfortunately the value from the custom field was not
>     expanded.
>     > It was correctly inserted in a regular paragraph.
>     > For example:
>     > \startchapter
>     > [title={A sample title}][custom_something={random_value}]
>     > ...
>     > \stopchapter
>     >
>     > How can I put the value of: custom_something in the header with
>     some prefix?
>
>     \define[2]\MyChapter{No.#1 – Prefix
>     \structureuservariable{custom_something}: #2}
>
>     \setuphead[chapter][
>       command=\MyChapter,
>     ]
>
>     Is this what you meant?
>
>     Hraban
>

Perhaps:

    \setuppagenumbering[alternative=doublesided,location=bottom]
    \startsetups chapter:headings
       \doifsomethingelse{\structureuservariable{custom}}
                         {\setupheadertexts[RI]
                                           [Prefix:
    \structureuservariable{custom}]
                                           [Prefix:
    \structureuservariable{custom}]
                                           [VO]}
                         {\setupheadertexts[RI][RO][VO][VI]}
    \stopsetups
    \setuphead[chapter]
               [style=\tfa,
                after={\blank\setups{chapter:headings}},
               ]
    \starttext
    \startchapter[title=Nothing special]
    \dorecurse{10}{\input knuth\par}
    \stopchapter
    \startchapter[title=Something special][custom={Hi there!}]
    \dorecurse{10}{\input knuth\par}
    \stopchapter
    \startchapter[title=More nothing special]
    \dorecurse{10}{\input knuth\par}
    \stopchapter
    \startchapter[title=More something special][custom={Bye Bye!}]
    \dorecurse{10}{\input knuth\par}
    \stopchapter
    \stoptext

-- 
Rik

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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p><font size="4"><br>
      </font></p>
    <div class="moz-cite-prefix"><font size="4">On 2022-12-20 14:31,
        Pawel Urbanski via ntg-context wrote:<br>
      </font></div>
    <blockquote type="cite"
cite="mid:CADUDiDFLAOO0EHkfd7RqHDmwYPJgi6YRmtBRCBHuiJA9Yq6RbA@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr"><font size="4">Hi,</font>
        <div><font size="4">Let me clarify my question more...</font></div>
        <div><font size="4">I need to attach some value to a chapter in
            that key. That custom prefix + the value in the key is ment
            to be in the header or a footer as a matter of fact. The
            case can apply to both headers and footers.</font></div>
        <div><font size="4">I tried:</font></div>
        <div><font size="4">\chapter[title={A sample
            title}][custom_random={custom_value}]</font></div>
        <div><font size="4">\setupheadertexts[{Prefix:
            \structureuservariable{custom_random}}]</font></div>
        <div><font size="4">...</font></div>
        <div><font size="4">\stopchapter</font></div>
        <div><font size="4">I tried this code when trying to figure out
            the mechanism. The prefix string in placed in the header,
            but hte custom value of the attached key is not expanded..</font></div>
        <div><font size="4">Evey page will contain just one section
            started by a \startchapter and \stop chapter. I would like
            to put this custom attached value in the right slot in the
            document header.</font></div>
        <div><font size="4"><br>
          </font></div>
        <div><font size="4">I hope that htis time around htigs are more
            clear.</font></div>
      </div>
      <font size="4"><br>
      </font>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr"><font size="4">On Tue, Dec 20,
            2022 at 8:13 PM Henning Hraban Ramm via ntg-context &lt;<a
              href="mailto:ntg-context@ntg.nl" moz-do-not-send="true"
              class="moz-txt-link-freetext">ntg-context@ntg.nl</a>&gt;
            wrote:<br>
          </font></div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><font
            size="4">Am 20.12.22 um 19:44 schrieb Pawel Urbanski via
            ntg-context:<br>
            &gt; Dear Friends,<br>
            &gt; I s-- pent some time searching and coding simple
            documents, but failed and <br>
            &gt; therefore I'm asking for help...<br>
            &gt; A section such as chapter cn have custom keys with
            values. One uses the: <br>
            &gt; \structureuservariable command to access such values.<br>
            &gt; How can I use such a value to create a custom header in
            a format:<br>
            &gt; Prefix: \structureuservariable{foo}<br>
            &gt; <br>
            &gt; I am asking for the only thing that worked when I tried
            was calling the: <br>
            &gt; \setupheadertexts command inside a chapter environment
            block with some <br>
            &gt; prefix. Unfortunately the value from the custom field
            was not expanded.<br>
            &gt; It was correctly inserted in a regular paragraph.<br>
            &gt; For example:<br>
            &gt; \startchapter<br>
            &gt; [title={A sample
            title}][custom_something={random_value}]<br>
            &gt; ...<br>
            &gt; \stopchapter<br>
            &gt; <br>
            &gt; How can I put the value of: custom_something in the
            header with some prefix?<br>
          </font>
          <font size="4"><br>
            \define[2]\MyChapter{No.#1 – Prefix <br>
            \structureuservariable{custom_something}: #2}<br>
          </font>
          <font size="4"><br>
            \setuphead[chapter][<br>
              command=\MyChapter,<br>
            ]<br>
          </font>
          <font size="4"><br>
            Is this what you meant?<br>
          </font>
          <font size="4"><br>
            Hraban</font></blockquote>
      </div>
    </blockquote>
    <p><font size="4"><br>
      </font></p>
    <p><font size="4">Perhaps:</font></p>
    <blockquote><font size="4" face="monospace">\setuppagenumbering[alternative=doublesided,location=bottom]<br>
        \startsetups chapter:headings<br>
          \doifsomethingelse{\structureuservariable{custom}}<br>
                            {\setupheadertexts[RI]<br>
                                              [Prefix:
        \structureuservariable{custom}]<br>
                                              [Prefix:
        \structureuservariable{custom}]<br>
                                              [VO]}<br>
                            {\setupheadertexts[RI][RO][VO][VI]}<br>
        \stopsetups<br>
        \setuphead[chapter]<br>
                  [style=\tfa,<br>
                   after={\blank\setups{chapter:headings}},<br>
                  ]<br>
        \starttext<br>
        \startchapter[title=Nothing special]<br>
        \dorecurse{10}{\input knuth\par}<br>
        \stopchapter<br>
        \startchapter[title=Something special][custom={Hi there!}]<br>
        \dorecurse{10}{\input knuth\par}<br>
        \stopchapter<br>
        \startchapter[title=More nothing special]<br>
        \dorecurse{10}{\input knuth\par}<br>
        \stopchapter<br>
        \startchapter[title=More something special][custom={Bye Bye!}]<br>
        \dorecurse{10}{\input knuth\par}<br>
        \stopchapter<br>
        \stoptext</font><font size="4"><br>
      </font></blockquote>
    <p><font size="4">-- <br>
        Rik<br>
      </font></p>
  </body>
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