ghost/core/client/components/gh-trim-focus-input.js

var TrimFocusInput = Ember.TextField.extend({
    focus: true,

    setFocus: function () {
        if (this.focus) {
            this.$().val(this.$().val()).focus();
        }
    }.on('didInsertElement'),

    focusOut: function () {
        var text = this.$().val();

        this.$().val(text.trim());
    }
});

export default TrimFocusInput;