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KnockoutjsでDOM要素にバインドされてるViewModelを取得する

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KnockoutjsのViewModelとかデバッグ中に参照したくなるわけですが、
たいていconsoleとかからはインスタンスの変数はどっかのスコープで隠れてて見えない。

でも、なんとかしたい。そんな時。

contextFor

ko.contextFor(<element>)

で、バインドされてるcontextが取れる。

$root

ko.contextFor(<element>).$root

すれば、applyBindingに渡したViewModelが取れる。

chromeでデバッグ中に便利な$0

devツールでelementを選択している状態で、
consoleで $0 だけ打ってみるとそのDOM要素の参照が取得できる。

なので、デバッグ中は
ko.contextFor($0).$root
こうしてViewModelを取ると楽。

contextForを知るまで

debug版使ってる時は
ko.storedBindingContextForNode(<element>)で取れてた。

min にした時は

var vm = new ViewModel();
window.vm = vm;

をデバッグ時だけ埋め込んでた。
もちろんcommitとかはしない。

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