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I need to put checkbox with name "Zoom to extents" which will zoom to full map extent (first extent which appears by opening web page). Can someone help me? In mapfile I have this "EXTENT 563090 5072655 588220 5093325".

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Maybe this tutorial can help: http://docs.huihoo.com/mapserver/5.2.1/mapscript/php/by_example.html

This code will zoom out, zoom in, pan, and restore to full extent the image displayed in the previous example.

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That tutorial is for using PHP mapscript (note: current version is at mapserver.org/mapscript/php/by_example.html, search the page for 'Full Extent'). If you want "old school" CGI mapserver, try this tutorial: biometry.gis.umn.edu/tutorial/sections.html and/or the CGI variables page mapserver.org/cgi/controls.html. – neuhausr Jun 13 '11 at 14:25

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