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The answer on your question depends a little how you interpret the "filtering". If you want use some external controls (selects, checkboxes and so on on the same page where you have jqGrid) to filter your data I recommend you to read http://stackoverflow.com/quest.....19#2928819
If you want to implement data filtering inside of jqGrid you can choose between serching with respect of "search" and reset of serching results with respect of "refresh" buttons of the /jqgridwiki/doku.php?id=wiki:navigator) action which provide the grid data or add three string parameters searchField, searchString, searchOper if you want to use simple searching feature. In all cases you will have to add WHERE to the SELECT statments which will be constructed in your program based on the values of the new parameters.
Probably other people post you more urls to the good full code examples which you could use.
By the way is the question http://stackoverflow.com/quest.....g are yours?
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