单击“保存并关闭”按钮后，调用preventDefault时，OnSave事件将触发两次

Question

I've got the following onSave handler on my form:

onSave: function (executionContext) {
    var eventArgs = executionContext.getEventArgs();
    var isValid = validate();
    if (!isValid) {
        eventArgs.preventDefault();
        return false;
    }
},

To my surprise, onSave is called twice if preventDefault() is called, but only when clicking the "Save and Close" button (this behavior doesn't happen when clicking the "Save" button).

Note that you can use the following code as well to reproduce the issue:

onSave: function (executionContext) {
    var eventArgs = executionContext.getEventArgs();
    eventArgs.preventDefault();
},

I'd like to know if that's a known issue, and if so, what's your approach to solve it?

Answer 1

You probably have auto-save turned on (System Setting - Enable auto-save on all forms). For auto-save, save is done when you click save and also when you close/navigate from the form. So this is basically by design- one event is triggered because you clicked the "Save" and second is because you also are closing the form (which basically is what "Save and Close" does).

You can check if this is auto-save using something like:

var eventArgs = econtext.getEventArgs();
if (eventArgs.getSaveMode() == 70 || eventArgs.getSaveMode() == 2) {
   //here you know you are in auto-save
}