Thanks. I created a custom formatter for checkbox column called checkboxFormatter().
----------------------------------------------------------------------------------------------------------------------------------------------------------------- <html> <head> <title>jqGrid - Custom Formatter</title> <link rel="stylesheet" type="text/css" href="/themes/coffee/ grid.css" title="coffee" media="screen" /> <script src="/jquery-1.3.2.js" type="text/javascript"></script> <script src="/jqgrid/jquery.jqGrid.js" type="text/javascript"></ script> <script src="/jqgrid/js/jqModal.js" type="text/javascript"></ script> <script src="/jqgrid/js/jqDnR.js" type="text/javascript"></script> <script type="text/javascript"> jQuery(document).ready(function() { jQuery("#list1").jqGrid({ url: '/Data/GridDataNamedColums/', datatype: 'json', mtype: 'GET', jsonReader: { total: "total", //total pages for the query page: "page", //current page of the query records: "records", //total number of records for the query root: "rows", //an array that contains the actual data repeatitems: false, id: "other" //the unique id of the row }, colNames: ['someNumber', 'vote', 'Title', 'other'], colModel: [ { name: 'someNumber', width: 40, align: 'left' }, { name: 'vote', width: 40, align: 'left', formatter: checkboxFormatter }, { name: 'Title', width: 400, align: 'left' }, { name: 'other', width: 40, align: 'left' }, ], onSelectRow: function(rowid) { alert('Selected ... rowid=' + rowid); }, pager: jQuery('#pagerBar'), rowNum: 10, //rowList: [2, 5, 10, 20, 50], viewrecords: true, height: 250, imgpath: '/themes/coffee/images', caption: 'Custom Formatter grid' }); }); //checkboxFormatter to wire onclick event of checkbox function checkboxFormatter(el, cval, opts) { cval = cval + ""; cval = cval.toLowerCase(); var bchk = cval.search(/(false|0|no|off|n)/i) < 0 ? " checked=\"checked\"" : ""; $(el).html("<input type='checkbox' onclick=\"ajaxSave('" + opts.rowId + "', this);\" " + bchk + " value='" + cval + "' offval='no' />"); } function ajaxSave(rowid, curCheckbox) { //ajax Save code } </script> </head> <body> <h2>List - CUSTOM Formatter </h2> <table id="list1" class="scroll" cellpadding="0" cellspacing="0"></table> <div id="pagerBar" class="scroll" style="text-align:center;"></ div> </body> </html> ----------------------------------------------------------------------------------------------------------------------------------------------------------------- Predefined formatter function, present in jquery.fmatter.js file, are called from $.unformat and fireFormatter functions. But I have simply added 'checkboxFormatter' in web page (as shown above). I have NOT modified jquery.fmatter.js. Is this correct ? Thank You.