jqGrid - Inline edit - Detect dirty / changed cell

问题:

is there an example of using jqgrid's getChangedCells method to determine if data has changed?

I grepped getChangedCells in the downloadable demos for jqgrid, and could only find the function definition, not example usages of getChangedCells.

What I want to do is save the edits that a user's made if the user clicks on another row. But, I only want to submit the save if the row is dirty.

Thanks in advance, --Nate

回答1:

There are no safe dirty flag on the row. You can use the fact that at the beginning of row editing (at the start of the inline editing mode) the method editRow add editable="1" attribute to the grid row (<tr> element). Later the methods saveRow and restoreRow changes the attribute value to editable="0". So the rows of the current page which was at least once in the inline editing mode will have the editable attribute. If the id of the table element is "list" you can find the edited rows with

$("#list tr[editable]")

The ids of the elements of the set are the rowids of the rows.

If you use paging in the grid you should be careful and save the ids of the edited rows on the current page before the changing of the page. The onPaging event would help you here.

In my opinion the best and the most safe way to do what you need is to use aftersavefunc parameter of the editRow or saveRow methods (probably you use directly only editRow). Inside of your aftersavefunc function you can save the id of the modified row in an array/map. This will solve your problem and will safe work.

回答2:

Finally, I managed to bring a piece of code to detect what we want ;)

Hopefully any jqgrid gurus there (like Oleg), have enough time to review this code and improve it.

The example code will work for detect data changed in a grid with an editable field named "name". If you want to check for changed data in more columns, you have to add the variables after_edit and before_edit asociated with that columns.

To get the previous cell data inside the onSelectRow function, I don't used the getCell method because in the documentation says in red:

Do not use this method when you editing the row or cell. This will return the cell content and not the actuall value of the input element

By disgrace I could check that the documentation was right :(. However the getCell function works properly with the current cell data.

And here is the code:

 // Declare variables used for inline edit functionality.
 var last_selected;
 var before_edit_value;
 var after_edit_value;
 $('#grid-id').jqGrid({
...

onSelectRow: function(row_id){
    if(row_id && row_id !== last_selected) {
        /*
         * Determine if the value was changed, if not there is no need to save to server.
         */
         if (typeof(last_selected) != 'undefined') {
            after_edit_value = $('#grid-id tr#' + last_selected + ' .name_column input').val();
         }

        if (before_edit_value != after_edit_value) {
            /*
             * Save row.
             */
            $('#grid-id').jqGrid(
                'saveRow', 
                last_selected, 
                function(response){
                    /* SuccessFunction: Do something with the server response */

                    return true;    
                }, 
                'http://url.to.server-side.script.com/server-side-script.php', 
                {
                    additional_data: 'example: additional string',
                });
            }
            else {
                /*
                 * Restore the row.
                 */
                $('#grid-id').jqGrid('restoreRow', last_selected);
            }

        before_edit_value   = $('#grid-id').jqGrid('getCell', row_id, 'name');
    }   

    last_selected       = row_id;

    /*
     * Edit row.
     */
    $('#grid-id').jqGrid(
        'editRow', 
        row_id, 
        true, 
        function() {/* OnEditFunction */}, 
        function(response) {
        /* SuccessFunction: Do something with the server response */

        return true;

    }, 
    'http://url.to.server-side.script.com/server-side-script.php', 
    {
        additional_data: 'example: additional string',
    }); 
   },
...
});

回答3:

In one of my projects I did the following: before editing the row I remember row data in global variable and after editing is done just check if row data was changed. Something like this (edit mode activated by double click):

var beforeEditData;

function onGridDblClickRow(id) {
  if (isRowEditable(id)) {
    beforeEditData = grid.getRowData(id);
    grid.editRow(id, true, null, null, 'clientArray', null, onRowAfterEdit);
    ...
  }
}
function onRowAfterEdit(row) {
  var data = grid.getRowData(row);
  if (!isDataChanged(beforeEditData, data)) {        
    return; // No changes
  }
  ... // Save data here
}
function isDataChanged(before, after){
  ... // Allows tricky logic for dirty data, e.g. one may trim spaces etc.
}

回答4:

Using MVC4 and JQuery this is what I did

In the View

<script type="text/javascript">

var $grid = $("#Grid");
var lastSelection;
var datachanged = false;

function gridInitialised() {
    var headers = $('th>div>:input');
    for (var h = 0; h < headers.length; headers[h++].onclick = (function () { if (datachanged) { $grid.saveRow(lastSelection); datachanged = false; } }));
}

function editRow(id) {
    if (id && id !== lastSelection) {
        if (datachanged) { $grid.saveRow(lastSelection); datachanged = false; }
        $grid.restoreRow(lastSelection);
        $grid.editRow(id, true);
        var inputs = $('#'+id+'>td>:input[class="editable"]');
        for (var i = 0; i < inputs.length; inputs[i++].onchange = (function () { datachanged = true; }));
        lastSelection = id;
    }
}
</script>

@Html.Trirand().JQGrid(Model.Grid, "Grid")

in the Model

            Grid.ClientSideEvents.RowSelect = "editRow";
            Grid.ClientSideEvents.GridInitialized = "gridInitialised";

The gridInitialised code is to handle changes to the search filter.

Dave

回答5:

As Oleg mentioned 5 (wow) years ago - I used the saveRow function and passed the flag as extraparam.

something like this, assuming your "model" or a hidden column IsDirty in my case:

onSelectRow: function(id) {
                if (id && id !== lastgridsel) {
                    $("#myGrid").saveRow(lastgridsel, false, "clientArray", { IsDirty: "True" });
                    $("#myGrid").editRow(id, true, null, null, "clientArray");
                    lastgridsel = id;
                }
            },

and then loop through the rows on Save click (external button in my case), something along the lines of:

$("#gridSaveBtn").on("click", function() {
            var batch = new Array();
            var dataIds = $("#myGrid").jqGrid("getDataIDs");
            for (var i = 0; i < dataIds.length; i++) {
                try {
                    $("#myGrid").jqGrid("saveRow", dataIds[i], false, "clientArray");
                    //get row data
                    var data = $("#myGrid").jqGrid("getRowData", dataIds[i]);
                    if (data["IsDirty"] === "True") {
                        batch.push(data);
                    }
                } catch (ex) {
                    alert(ex.Message);
                    $("#myGrid").jqGrid("restoreRow", dataIds[i]);
                }
            }
        });