Multi-page table with caption aligned to the left edge

Question

I am trying to achieve same thing as in this question, but with longtable environment. Table itself is centered.

Using caption package and

\captionsetup[longtable]{justification=raggedright,singlelinecheck=off}

makes caption aligned to the left, but the caption sticks past the left edge of the table.

And I can't just add margin= or something, because my tables are not of the same width.

Is there a way to correct this, or maybe an alternative to longtable?

---

Example document:

\documentclass[a5paper,12pt,titlepage]{article}
\usepackage[a5paper]{geometry}

\usepackage{longtable}
\usepackage{caption}
\captionsetup[longtable]{skip=0pt,justification=raggedright,singlelinecheck=off}


\usepackage{lipsum}

\begin{document}

\lipsum[3-4]

\begin{longtable}{l|p{2.5cm}|p{2.5cm}}
%----------------------------------------
\caption{This label isn't where I want it}\label{tab:test}\\ \hline
Name & Description & Example\\
\endfirsthead
%----------------------------------------
\caption*{Table \ref{tab:test} (continued)}\\\hline
\endhead
%----------------------------------------
\hline
Something A & here's supposed to be some text & some text here \\ \hline
Something B & description of B & something more about B\\ \hline
Something C & describe C here & some example involving C \\ \hline
Something D & dfjashdfkjha sdflhasdkf hfsadf asdf & dsjkdlaskd ksjdla jdlkasj \\ \hline
\end{longtable}
\end{document}

---

Caption is aligned like this:

This is how I want it to look:

Answer 1

you can determine caption start width by setting \LTcapwidth to your table width. since its width is not know (in advance) it can be only by "trial and error" method ...

\documentclass[a5paper,12pt,titlepage]{article}
\usepackage[a5paper]{geometry}

\usepackage{longtable}
\usepackage{caption}
\captionsetup[longtable]{skip=0pt,justification=raggedright,singlelinecheck=off}

\usepackage{lipsum}

\begin{document}
\lipsum[3-4]

{\setlength\LTcapwidth{0.85\linewidth}
\begin{longtable}{l|p{2.5cm}|p{2.5cm}}
%----------------------------------------
\caption{This label isn't where I want it}\label{tab:test}\\ \hline
Name & Description & Example\\
\endfirsthead
%----------------------------------------
\caption*{Table \ref{tab:test} (continued)}\\\hline
\endhead
%----------------------------------------
\hline
Something A & here's supposed to be some text & some text here \\ \hline
Something B & description of B & something more about B\\ \hline
Something C & describe C here & some example involving C \\ \hline
Something D & dfjashdfkjha sdflhasdkf hfsadf asdf & dsjkdlaskd ksjdla jdlkasj \\ \hline
\end{longtable}
}
\end{document}

rdit:

in case, that you like use ltablex the width caption box width is the same as the width of table. therefore, it is known in advance and setting of table is simpler. for example:

\documentclass[a5paper,12pt,titlepage]{article}
\usepackage[a5paper]{geometry}

\usepackage{ltablex}
\usepackage{caption}
\captionsetup[longtable]{skip=0pt,justification=raggedright,singlelinecheck=off}

\usepackage{lipsum}

\begin{document}
\lipsum[3-4]

{\setlength\LTcapwidth{0.9\linewidth}
\begin{tabularx}{0.9\linewidth}{l|X|X}
%----------------------------------------
\caption{This label is where I want it}\label{tab:test}\\
    \hline
Name & Description & Example\\
\endfirsthead
%----------------------------------------
\caption*{Table \ref{tab:test} (continued)}\\\hline
\endhead
%----------------------------------------
\hline
Something A & here's supposed to be some text & some text here \\ \hline
Something B & description of B & something more about B\\ \hline
Something C & describe C here & some example involving C \\ \hline
Something D & dfjashdfkjha sdflhasdkf hfsadf asdf & dsjkdlaskd ksjdla jdlkasj \\ \hline
\end{tabularx}
}
\end{document}

which gives: