javascript - Computed Observable の変更が UI の title 属性を更新しない (knockout-bootstrap.js を使用)

Question

とにかく、この JS Fiddle で私の要素のタイトル属性の更新をトリガーする方法はありますか:

http://jsfiddle.net/YPXYJ/9/

要素の data-bind 属性のツールチップは、knockout-bootstrap.js ライブラリの一部であることに注意してください。

<label data-bind="text: copyOtherPartyHelpText()"></label>
<br />
<br />
 <i class="icon-question-sign" data-bind="tooltip: { title: copyOtherPartyHelpText(), placement: 'top', trigger: 'hover' }"></i>
<br />
<br />
<a style="cursor: pointer;" data-bind="click:changeHelpText">Click HERE To Change Label Text</a>

function MyViewModel() {
    this._copyOtherPartyHelpText = ko.observable();
    this.readOnlyView = ko.observable(true);


    this.copyOtherPartyHelpText = ko.computed({
        read: function () {
            var value = this._copyOtherPartyHelpText();

            if (value) {
                return value;
            }

            if (this.readOnlyView()) {
                value = 'Currently Disabled';
            } else {
                value = 'Match/agree to this term.';
            }
            //this makes things even worse, it is an initialization workaround
            //_copyOtherPartyHelpText(value);

            return value;
        },
        write: function (value) {
            this._copyOtherPartyHelpText(value);
        },
        owner: this
    });

    this.changeHelpText = function(){
        this.copyOtherPartyHelpText('help text updated but not tooltip');
    }
}


ko.applyBindings(new MyViewModel());

Answer 1

「これ」が必要でした。「this._copyOtherPartyHelpText()」および「this.copyOtherPartyHelpText ()」を参照する場合

どうぞhttp://jsfiddle.net/FtMdZ/2/

ko.observable();
    this.readOnlyView = ko.observable(true);


    this.copyOtherPartyHelpText = ko.computed({
        read: function () {
            var value = this._copyOtherPartyHelpText();

            if (value) {
                return value;
            }

            if (this.readOnlyView()) {
                value = 'Currently Disabled';
            } else {
                value = 'Match/agree to this term.';
            }
            //this makes things even worse, it is an initialization workaround
            //_copyOtherPartyHelpText(value);

            return value;
        },
        write: function (value) {
            this._copyOtherPartyHelpText(value);
        },
        owner: this
    });

    this.changeHelpText = function(){
        alert('changeHelpText called');
        this.copyOtherPartyHelpText('help text and UI updated');
    }
}


ko.applyBindings(new MyViewModel());