This is an Example for checking no of checkbox checked in an section not using jquery ( as jquery will not work in mobile version of ms crm)



function
 checkboxcheck() {   
    var innerhtmls = Xrm.Page.ui.tabs.get("tabname" ).sections.get( "Sectionname").$1l_0.innerHTML;
        // defaultvalue="1" = checked and defaultvalue="0" unchecked 
     var checkedis = innerhtmls.match( /defaultvalue="1"/g );

    // if non of checkbox  is checked give alert
    if (checkedis == null) {
        alert( "Alert msg" );
    }
}






SOURCE : JUST2CODE.IN
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SOURCE : JUST2CODE.IN
Subscribe to our YouTube channel : https://www.youtube.com/user/TheRussell2012