使用ko.observableArray检查重复项

Question

如何在添加之前检查重复签名.在下面的场景中,如果没有签名找到列表,我想添加签名.

    var Signature = function (name, interestDeclared) {
        this.Name = ko.observable(name);
       this.RelevantInterest = ko.observable(interestDeclared);
    } 

   viewModel = {

    signatures: ko.observableArray([]),

    addSignature: function () {
        var name = $('#signatureName').val();
        var intd = $('#interest').is(':checked');

        this.signatures.push(new Signature(name, intd));

    },
    deleteSignature: function (signature) {
        this.signatures.remove(signature);
     },

    insertWitness: function (signature, position) {
        this.signatures.splice(position, 0, signature);
      }
};

ko.applyBindings(viewModel, document.getElementById("signatories"));

谢谢, - 娜

Answer 1

您还可以在KO框架中使用一些内置的实用程序函数.我过去用这种技术解决了这个问题:

var name = $('#signatureName').val(),
    intd = $('#interest').is(':checked'),
    match = ko.utils.arrayFirst(this.signatures(), function (item) {
    if (item.Name() === name) {
         return selectedCounsel;
    }
});

if (!match) {
    // This means it wasn't already in our array, so we'll add it.
    this.signatures.push(new Signature(name, intd));
}

我也同意@madcapnmckay,不使用jQuery找到值从输入,更新模式,使signatureName和interest绑定到你的模型,并使用这些值.