请查看这个示例:
我想要做两件事:
第一:当字段为空时不进行验证。我知道有一个onlyif选项,但是否有更简单的方法?
第二:我需要在单击提交按钮时运行验证(如果您测试我的示例,错误消息将弹出,但不会应用errorClass css)。
谢谢:D
css:
input.error {
color: red;
border-color: red;
}
js:
ko.validation.configure({
insertMessages: false,
decorateElement: true,
errorElementClass: 'error',
messagesOnModified: false
});
function SignInViewModel() {
var self = this;
self.userName = ko.observable().extend({
required: true
});
self.password = ko.observable().extend({
required: true
});
self.errors = ko.validation.group(self);
self.login = function (e) {
if (self.errors().length == 0) {
alert('No errors');
} else {
this.errors().forEach(function(data) {
alert(data);
});
//self.errors.showAllMessages(true);
}
}
}
$(function () {
ko.applyBindings(new SignInViewModel());
});
html :
<form>
<fieldset>
<legend>User: <span data-bind='text: errors().length'></span> errors</legend>
<label>User name: <input data-bind='value: userName' type="text"/></label><br/>
<label>Password: <input data-bind='value: password' type="password"/></label>
</fieldset>
<button type="button" data-bind='click: login'>Login</button>
</form>
ko.validatedObservable
来解决,并在提交之前调用isValid()
。这将检查表单是否填写正确,同时显示现有的错误并添加错误类等。请参见https://github.com/Knockout-Contrib/Knockout-Validation#getting-started - Hans Roerdinkholder