TagTextBox add onFocusOut event

In TagTextBox if I type in text area without pressing separator char, text is lost (not converted to tag) when TagTextBox loses focus.

onFocusOut event in javascript should be the right way to handle it: wich is the best way to add it to my control?

I’ve used Javascript extender on my control to add this method:

this.addListener("focusout", function(e) {
    var text = this.__getFieldText();
    if (text) {
        this.__addTag(this.__getFieldText());
        this.__setFieldText("");
        e.stop();
    }
});

Code to handle tag copied from wisej-js/wisej.web.TextBox.TagTextBox.js at master · iceteagroup/wisej-js · GitHub

Methods __addTag and __setFieldText are defined in wisej.we.TextBox.TagTextBox.js

Is there a better way to do it?