Dear yyqdian
after many years passed here and many questions asked permit me to suggest you to follow theese guidelines:

Try, when is possible, to show the minimum code necessary to reproduce the problem you are experiencing. Many times, doing this, you'll discover a 'type 0' problem (the problem does not exists). In other cases monks will have something to explain you or to work with.

Try to be less telegraphic in your descriptions and questions. Many monks here, and maybe we too, are not english native, so simple sentences and clear words are more easy worldwide understood.

If someone propose a solution, before reposting, try it and show the results of the test.

Hth

L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to Re^3: Why treeview shows no content?Suggestions for a newcomer by Discipulus
in thread Why treeview shows no content? by yyqdian

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.