Dies ist mit meiner anderen Frage here verwandt! Ich versuche, einen benutzerdefinierten Validierungs-Extender ohne Verwendung der Validierungsbibliothek zu erstellen.knockout kann mehrere Observable mit Extender nicht erweitern
Ich bin nicht in der Lage, meinen Extender auf mehrere Observable zu erweitern. Im folgenden Szenario wird der Extender auf das Feld Passwort angewendet, nicht jedoch auf das Feld Passwort wiederholen.
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<script type="text/javascript" src="knockout-3.4.0.js"></script>
Name:<input type="text" data-bind="value:Name" /><br />
Already A User: <input type="checkbox" data-bind="checked:AlreadyUser" /><br />
Password:<input type="password" data-bind="value:Password,visible:PasswordVisible" /><br />
Retype Password:<input type="password" data-bind="value:RetypePassword,visible:PasswordVisible" /><br />
<input type="button" value="Submit" onclick="validateModel();" />
<script type="text/javascript" >
var pageModel;
ko.extenders.Validate = function (target, validateOptions) {
target.HasErrors = ko.computed(function() {
var newValue = target();
var required = validateOptions.required();
var validationType = validateOptions.validationType;
if (ko.unwrap(required)) {
switch (validationType) {
case "Text":
return newValue == '';
default:
target.HasErrors(false);
break;
}
}
return false;
}, null, { deferEvaluation: true }).extend({ notify: 'always' });
return target;
};
//The model itself
var ViewModel = function() {
var self = this;
self.Name = ko.observable('');
self.AlreadyUser = ko.observable(false);
//computed variable that sets the visibility of the password field. I have to clear the password when am making it invisible
self.PasswordVisible = ko.computed(function() { return !this.AlreadyUser(); }, this).extend({ notify: 'always' });
//this field is only required when visible
self.Password = ko.observable('').extend({ Validate: { required: function() { return self.PasswordVisible(); }, validationType: "Text" } });
self.RetypePassword = ko.observable('').extend({ Validate: { required: function() { return self.PasswordVisible(); }, validationType: "Text" } });
self.AlreadyUser.subscribe(function (newVal) { self.RetypePassword(''); });
self.HasErrors = ko.computed(function() { return self.Password.HasErrors() && self.RetypePassword.HasErrors(); }, self);
};
//The method calls on click of button
function validateModel() {
alert(pageModel.HasErrors());
}
//create new instance of model and bind to the page
window.onload = function() {
pageModel = new ViewModel();
ko.applyBindings(pageModel);
};
</script>
</body>
</html>
Ich habe dieses Problem erfolgreich – Ramki