$("#myjtable").jtable({
...,
recordPreview : true,  // setting recordPreview to true, a view icon will appeare beside edit icon in each row
...,
fields : {
    ...,
    first_name : {
               title : 'First name',
               edit : true,
               create : true,
               preview : true, // specify which field you want to be shown in preview dialog
               type : 'text'
                },
    ...
});

$("#myjtable").jtable({
...,
createFormColumns : 2,  // set the number of columns in new record dialog
editFormColumns : 2,  // set the number of columns in edit record dialog
viewFormColumns : 2,  // set the number of columns in record preview dialog
...

});

$("#myjtable").jtable({
...,
fields : {
    ...,
    first_name : {
               title : 'First name',
               edit : true,
               create : true,
               delete : true, // setting delete option of field to true, sends this field beside key field as parameters to delete request.
               type : 'text'
                },
    ...
});