Question

我正在使用Knockout.js。我有一个页面，我有三个复选框，它在foreach循环下。这是我的代码：

<div class="form-horizontal" id="ko-bind-element">
    <input type="hidden" id="serverJSON" value="@Newtonsoft.Json.JsonConvert.SerializeObject(Model)" />
    <div data-bind="foreach: procedures">
        <div data-bind="template: { name: Mode(), data: $data }"></div>
    </div>
</div>
<script type="text/html" id="procedure">
    <table class="table table-bordered">
        <tr>
            <td class="col-md-3"><span data-bind="text: Name"></span>
            </td>
            <td>
                <input type="checkbox" data-bind="attr: { name: (VId.length > 0) ? VId : Name },checked: AlreadyCompleted" />
            </td>
            <td>
                <input type="checkbox" data-bind="attr: { name: (VId.length > 0) ? VId : Name },checked: NotApplicable" />
            </td>
            <td>
                <input type="checkbox" data-bind="attr: { name: (VId.length > 0) ? VId : Name },checked: CreateNew" />
            </td>
        </tr>
        <tr>
            <td colspan="4" style="padding:0;">
                <div data-bind="if: CreateNew">
                    <textarea style="margin-top:10px; margin-bottom:10px;" class="col-md-offset-3 col-md-8" data-bind=" value : Text"></textarea>
                    <div class="clearfix"></div>
                </div>
            </td>
        </tr>
    </table>
</script>

由于每行有三个复选框，我只想选择其中一个，所以我有这个jQuery函数，每行选择一个复选框

$("input:checkbox").on('click', function() {
    debugger;
    // in the handler, 'this' refers to the box clicked on
    var $box = $(this);
    if ($box.is(":checked")) {
        // the name of the box is retrieved using the .attr() method
        // as it is assumed and expected to be immutable
        var group = "input:checkbox[name='" + $box.attr("name") + "']";
        // the checked state of the group/box on the other hand will change
        // and the current value is retrieved using .prop() method
        $(group).prop("checked", false);
        $box.prop("checked", true);
    } else {
        $box.prop("checked", false);
    }
});

但问题是现在，当我选中第一个复选框然后取消选中它。然后选中第二个复选框并提交数据。第一和第二显示都已检查。所以不知道它的Knockout问题。

这是绑定代码：

viewModel = {
    MtocFormID: 0,
    procedures: ko.observableArray(),
    dateid: null
};
$(document).ready(function() {
    var data = JSON.parse($("#serverJSON").val());
    viewModel.MtocFormID = ko.observable(data.ID);
    // viewModel.dateid = ko.observable(data.ExpiryDate)
    $(data.TemplateProcedure).each(function(index, element) {
        var mappedItem = {
            //    otherSafetyPro: ko.observableArray([]),
            VId: ko.observable(element.VId),
            TemplateID: ko.observable(element.TemplateID),
            ProcedureTemplateID: ko.observable(element.ProcedureTemplateID),
            Name: ko.observable(element.Name),
            AlreadyCompleted: ko.observable(element.AlreadyCompleted),
            NotApplicable: ko.observable(element.NotApplicable),
            CreateNew: ko.observable(element.CreateNew),
            Text: ko.observable(element.Text),
            Mode: ko.observable("procedure")
        }
        viewModel.procedures.push(mappedItem);
    });
    ko.cleanNode(document.getElementById("ko-bind-element"));
    ko.applyBindings(viewModel, document.getElementById("ko-bind-element"));
    form08wizard.submitData(getSubmitData);
});

Answer 1

您可以使用subscribe功能来确定是否选中了复选框，然后修改其他复选框。而且我更喜欢以这种方式安排viewmodel。

var singleViewModel = function(element){
  var self = this;
  // self.otherSafetyPro = ko.observableArray([]);
  self.VId = ko.observable(element.VId);
  ...
  self.Completed = ko.observable(element.AlreadyCompleted);
  self.NotApplicable = ko.observable(element.NotApplicable);
  self.CreateNew = ko.observable(element.CreateNew);
  self.Completed.subscribe(function(newValue) {
    if(newValue) {
      self.NotApplicable(false);
      self.CreateNew(false);
    }
  });
  self.NotApplicable.subscribe(function(newValue) {
    if(newValue) {
      self.Completed(false);
      self.CreateNew(false);
    }
  });
  self.CreateNew.subscribe(function(newValue) {
    if(newValue) {
      self.NotApplicable(false);
      self.Completed(false);
    }
  });
}

然后这就是你如何分配它

$(data.TemplateProcedure).each(function (index, element) {
  viewModel.procedures.push(new singleViewModel(element));
});

另一个样本：

＆＃13;

function ViewModel() {
  var self = this;
  self.optionA = ko.observable(false);
  self.optionA.subscribe(function(newValue){
    if(newValue) {
      self.optionB(false);
      self.optionC(false); 
    }
  });
  self.optionB = ko.observable(false);
  self.optionB.subscribe(function(newValue){
    if(newValue) {
      self.optionA(false);
      self.optionC(false); 
    }
  });
  self.optionC = ko.observable(false);
  self.optionC.subscribe(function(newValue){
    if(newValue) {
      self.optionA(false);
      self.optionB(false); 
    }
  });
}   

$(document).ready(function () {
  var myViewModel = new ViewModel();
  ko.applyBindings(myViewModel);
});

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>

<div>
  <input type="checkbox" data-bind="checked: optionA" />
  <input type="checkbox" data-bind="checked: optionB" />
  <input type="checkbox" data-bind="checked: optionC" />
</div>

＆＃13;

复选框属性检查值未在knockout js中更新

1 个答案: