敲除验证-空时不验证输入+提交时求值 [英] Knockout Validation - Dont validate input when empty + evaluate when submit

问题描述

检查这个小提琴:

http://jsfiddle.net/bhzrw01s/

我正在尝试做两件事:

第一:在字段为空时不进行验证.我知道有一个onlyif选项..但是有什么更简单的方法吗?

First: Dont validate when the field is empty. I know there is a onlyif option.. but is there something easier?

第二:当我单击提交"时，我需要一些东西来运行验证(如果您对我的小提琴进行了测试，则会弹出错误消息，但不会应用errorClass css)

Second: I need something to run the validation when i click on submit (If you test my fiddle, the error messages will pop, but wont apply the 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>

推荐答案

第一个解决方案将完成您要求的90％.在用户点击提交"或删除之前填充的字段之前，它不会显示任何验证.一旦他们打破密封(可以这么说)，他们将收到该领域的实时验证反馈.这是我要使用的解决方案，因为它是敲除验证的预期行为.

The first solution will do 90% of what you are asking. It will not display any validation until the user hits submit, or until they delete a previously populated field. Once they break the seal (so to speak), they will receive real time validation feedback for that field. This is the solution I would use because it is how knockout validation was intended to behave.

http://jsfiddle.net/k08m4dfx/

    self.login = function (e) {
        if (self.errors().length > 0) {
            self.errors.showAllMessages(true);
            this.errors().forEach(function(data) {
               alert(data);
            });
        }
    }

如果由于某种原因您必须推迟所有验证反馈直到它们单击，那么您可以将isModified标志弄乱以获得所需的行为.不过，对我来说似乎有点糊涂.

If for some reason you have to defer all validation feedback until they click, then you could mess with the isModified flag to get the behavior you want. It seems a little kludgy to me though.

http://jsfiddle.net/zd97gjg4/

    ko.extenders.deferValidation = function (target, option) {
        if (option) {
            target.subscribe(function(){
                target.isModified(false);
            });
        }

        return target;
    };

    self.userName = ko.observable().extend({
        required: {message: 'User name is required' },
        deferValidation: true
    });

    self.password = ko.observable().extend({
        required: {message: "Password is required" },
        deferValidation: true
    });

这篇关于敲除验证-空时不验证输入+提交时求值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！