kendo ui form update cancel button

问题

I am trying to a simple kendo ui form with 'Save' and 'Cancel' buttons. I am using the Kendo.Observable to bind the data to the form. The functionality I am trying to achieve is, if the 'Save' button is clicked, the form data will be saved. Else, if 'Cancel' is clicked the form will come back to read-only mode with the previous data that was present. To do this, I am first saving the model data in a 'originalvalue' property on click of Update button. If 'Cancel' is clicked, the 'fields' model data is restored to the 'originalvalue'. But the issue is that the , 'originalvalue' does not contain the original value. It gets updated when the user is editing during 'Save'. The question is - how do I retain the original model data so that it can be refreshed on cancel? Please find below the code. Appreciate your help, thanks.

<script type="text/javascript">
    var viewModel = kendo.observable ({

        updated: false,
        originalvalue: {},

        update: function(e) {
            var original = this.get("fields");
            this.set("originalvalue", original);
            this.set("updated", true);
        },

        save: function(e) {
             e.preventDefault();
             if (validator.validate()) {
                    // make an ajax call to save this data
                    this.set("updated", false);
             } 

        },

        cancel: function(e) {
            var original = this.get("originalvalue");
            validator.destroy();
            this.set("fields", original);
            this.set("updated", false);

        },

        fields: {}
    });

    viewModel.set("fields", formArray);     
    kendo.bind($("#outerForm"), viewModel);

    // prepare the validator
    var validator = $("#outerForm").kendoValidator().data("kendoValidator");

回答1:

I had to make the exact thing on a form I am currently developing. I am using a DataSource object for the data so I had to use cancelChange().

The thing I did there: 1. I made a Datasource with a schema:

 ... schema: {
model: {id: "id"}}
...

2. I got the object I was editing with the mapped id:

clientDataSource.cancelChanges(clientDataSource.get(this.get("contactID")));

where the ContactID is created in a setData function where I have passed the ID:

 this.set("contactID", contactID);

As I may have notices and understood, you have another problem here where you arent using a DataSource but rather data for fields? The problem here is that your originalValue is inside the Observable object and it is referenced to the variable original and thus it has observable properties. You should have the variable originalValue defined outside the observable object:

var originalValue;

var viewModel = kendo.observable ({ ...

And you should send the formArray also to that variable so you will have the defaults load before even the observable object is loaded such as:

originalValue =   formArray;  
viewModel.set("fields", formArray);  

So when you need to cancel it you should have:

cancel: function(e) {
            var original = originalValue;
            validator.destroy();
            this.set("fields", original);
            this.set("updated", false);

        }, 

I havent tested it but it should provide you some guidance on how to solve that problem.

来源：https://stackoverflow.com/questions/22565570/kendo-ui-form-update-cancel-button