[ http://issues.apache.org/jira/browse/NUTCH-39?page=comments#action_62343
]
Jack Tang commented on NUTCH-39:
--------------------------------
And here is my solution. I only add the pagination in Intranet search. You can
follow below steps:
1. Add some attribues into search.jsp to support pagination.
/**
* -----------------------------------------------------------------------
* Page navigation attributes
*
* supposedRange
* |<------------->|
* Previous << 1 2 3 4 >> Next
* ^
* pivot
*
* forward
* |<-->|
* Previous << 3 4 5 6 >> Next
* ^
*/
private static int supposedRange = 4; // items show in naviagtion
private static int pivot = 1; // pivot in the page navigation
private static long[] history = new long[]{0,0}; // use click footprint
int forward = 1; // the distance navigation window will
move forward
//-------------------------------------------------------------------------
2. Replace "Next" button with pagination
a) the code to be removed
<%
if ((hits.totalIsExact() && end < hits.getTotal()) // more hits to show
|| (!hits.totalIsExact() && (hits.getLength() > start+hitsPerPage))) {
%>
<form name="search" action="../search.jsp" method="get">
<input type="hidden" name="query" value="<%=htmlQueryString%>">
<input type="hidden" name="start" value="<%=end%>">
<input type="hidden" name="hitsPerPage" value="<%=hitsPerPage%>">
<input type="hidden" name="hitsPerSite" value="<%=hitsPerSite%>">
<input type="hidden" name="clustering" value="<%=clustering%>">
<input type="submit" value="<i18n:message key="next"/>">
</form>
<%
}
%>
b) the codes to be added
<%
if ((hits.totalIsExact() //&& end < hits.getTotal()) // more hits to show
//|| (!hits.totalIsExact() && (hits.getLength() > start+hitsPerPage)))
)){
%>
<%
long curP = end/hitsPerPage + (end%hitsPerPage > 0 ? 1:0); //
get current page
end = end % hitsPerPage > 0? (end/hitsPerPage + 1)*hitsPerPage
: end; // fix end page
long actualRange = hits.getTotal() / hitsPerPage +
(hits.getTotal()%hitsPerPage > 0 ? 1: 0); // total pages after searching
long range = Math.min(supposedRange,actualRange); //
used below
/**
* +---+
* | 1 | <-- current click
* |---|
* | 0 | <-- previouse click
* +---+
*/
history[0] = history[1];
history[1] = curP;
if(curP > range)
{
if(curP - pivot >= range) // Now, current page in at
the edge of navigation window
if(history[0] < history[1]) // and use click
"Next" again
pivot += forward;
else
pivot -= forward; //
otherwise, he click the "Previouse" button
} else
{
pivot = 1;
}
%>
<div id=result>
<p>
<b>Results Page:</b><br>
<% // Previouse button(<<) %>
<%if(curP > 1){%>
<big><b><a
href="../search.jsp?query=<%=URLEncoder.encode(queryString,"UTF-8")%>&start=<%=end
- 2*hitsPerPage
%>&hitsPerPage=<%=hitsPerPage%>&hitsPerSite=<%=hitsPerSite%>&clustering=<%=clustering%>&pivot=<%=pivot%>">Prev</a></b></big>
<a
href="../search.jsp?query=<%=URLEncoder.encode(queryString,"UTF-8")%>&start=<%=end-
2*hitsPerPage
%>&hitsPerPage=<%=hitsPerPage%>&hitsPerSite=<%=hitsPerSite%>&=<%=clustering%>&pivot=<%=pivot%>"><img
src=../img/ar_prev.gif width=7 height=13 border=0 alt=""></a>
<%}%>
<% // Navigation window %>
<%
long prevStart = 0;
long nextStart = 0;
for(int i=pivot; i< range + pivot; i++)
{
prevStart = end - (curP - i + 1) * hitsPerPage;
// previouse
nextStart = end + (i - curP - 1) * hitsPerPage;
// next
if( i < curP )
out.println("<a
href=\"../search.jsp?query=" + URLEncoder.encode(queryString,"UTF-8") +
"&start=" + prevStart + "&hitsPerPage=" + hitsPerPage + "&hitsPerSite=" +
hitsPerSite + "&clustering=" + clustering + "&pivot=" + pivot + "\"
title=\"Results " + (prevStart + 1) + " - " + (prevStart + hitsPerPage) + "\">
"+ i + "</a> ");
else
if( i == curP)
out.println(i + " ");
else
out.println("<a
href=\"../search.jsp?query=" + URLEncoder.encode(queryString,"UTF-8") +
"&start=" + nextStart + "&hitsPerPage=" + hitsPerPage + "&hitsPerSite=" +
hitsPerSite + "&clustering=" + clustering + "&pivot=" + pivot + "\"
title=\"Results " + (nextStart + hitsPerPage + 1) + " - " + (Math.min(nextStart
+ 2 * hitsPerPage,hits.getTotal())) + "\"> "+ i + "</a> ");
}
%>
<% // Next button (>>)%>
<%if((end < hits.getTotal())){%>
<a
href="../search.jsp?query=<%=URLEncoder.encode(queryString,"UTF-8")%>&start=<%=end%>&hitsPerPage=<%=hitsPerPage%>&hitsPerSite=<%=hitsPerSite%>&=<%=clustering%>"><img
src=../img/ar_next.gif width=7 height=13 border=0 alt=""></a>
<big><b><a
href="../search.jsp?query=<%=URLEncoder.encode(queryString,"UTF-8")%>&start=<%=end%>&hitsPerPage=<%=hitsPerPage%>&hitsPerSite=<%=hitsPerSite%>&clustering=<%=clustering%>&pivot=<%=pivot%>">Next</a></b></big>
<%}%>
</p>
</div>
<%
}
%>
> pagination in search result
> ---------------------------
>
> Key: NUTCH-39
> URL: http://issues.apache.org/jira/browse/NUTCH-39
> Project: Nutch
> Type: Improvement
> Components: web gui
> Environment: all
> Reporter: Jack Tang
> Priority: Trivial
>
> Now in nutch search.jsp, user navigate all search result using "Next" button.
> And google like pagination will feel better.
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