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In questo semplice tutorial jQuery vi mostreremo come contare quante checkbox sono state selezionate. Iniziamo!

 
$('#table :input[type="checkbox"]:checked').length
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In questo semplice tutorial vi mostreremo come aprire un popup con Javascript.

 
    W = window,
    D = document;
 
    //set the window to widgets dimensions
    var winH = 400, //allow for window padding and header
        winW = 400,
        winT = 400,
        winL = 400;
 
    //set the content
    var windowName = 'Widget', // should not include space for IE
        path = W.location.path,
        windowOptions = 'location=0,status=0,toolbar=0,dependent=1,resizable=1,menubar=0,screenX=' + winL + ',screenY=' + winT + ',width=' + winW + ',height=' + winH,
        that = this;
 
    //note path needs to be in the same domain...
 
    //open the window
    that._Window = window.…

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