ne utiliseriez-vous pas simplement la liaison de données hasFocus?
https://jsfiddle.net/0o89pmju/52/
cliquez sur le bouton nom clair et validation échoue. et l'autofocus sera réglé sur le prénom.
Je n'étais pas tout à fait la suite de votre extension si je le besoin un de la documentation http://knockoutjs.com/documentation/extenders.html
html
<p data-bind="css: { error: firstName.hasError }">
<input data-bind='value: firstName, valueUpdate: "afterkeydown", hasFocus: firstName.hasError' />
<span data-bind='visible: firstName.hasError, text: firstName.validationMessage'> </span>
</p>
<p data-bind="css: { error: lastName.hasError }">
<input data-bind='value: lastName, valueUpdate: "afterkeydown"' />
<span data-bind='visible: lastName.hasError, text: lastName.validationMessage'> </span>
</p>
<p>
<button data-bind="click: clearName">clear first name</button>
</button>
</p>
js
ko.extenders.required = function(target, overrideMessage) {
//add some sub-observables to our observable
target.hasError = ko.observable();
target.validationMessage = ko.observable();
//define a function to do validation
function validate(newValue) {
target.hasError(newValue ? false : true);
target.validationMessage(newValue ? "" : overrideMessage || "This field is required");
}
//initial validation
validate(target());
//validate whenever the value changes
target.subscribe(validate);
//return the original observable
return target;
};
function AppViewModel(first, last) {
var self = this;
this.firstName = ko.observable(first).extend({
required: "Please enter a first name"
});
this.lastName = ko.observable(last).extend({
required: ""
});
this.clearName = function() {
self.firstName('');
self.lastName('');
}
}
ko.applyBindings(new AppViewModel("Bob", "Smith"));
self.FirstName = ko.observable (rapport .OverallRetention) .extend ({reportValueChange: {property: firstName}}); Ko.extenders.reportValueChange = fonction (cible, option) { débogueur; ; var _oldValue; target.setFocus = function (val) { target.hasfocus = val; }; target.subscribe (function (oldValue) { _oldValue = ancienne valeur; }, null, 'beforeChange'); target.subscribe (function (nouvelleValeur) { /////// Vous voulez définir la mise au point ici } – ALI