淘汰赛:无法处理绑定 [英] Knockout: Unable to process binding

问题描述

我早些时候问了这个问题，但是没有得到答案.

I asked this question earlier but did not get an answer.

我运行代码时收到以下错误消息:

I get this error message when I run my code:

Uncaught ReferenceError: Unable to process binding "visible: function (){return !editable() }"
Message: editable is not defined 

可编辑功能应该切换为真/假，然后在按下按钮时切换到编辑模式.这个按钮是通过html中的foreach调用的，所以我猜测它与我的viewmodel有关.我从getJson获得的输出工作正常，但可编辑的函数以某种方式发生冲突.

the editable function is supposed to toggle true/false and then switch to edit mode when a button is pressed. This button is called through a foreach in the html so i'm guessing it has something to do with my viewmodel. The output I get from my getJson works fine but the editable function conflicts somehow.

这是我的html代码:

Here is my html code:

<div><ul data-bind="foreach: comments">
  <li class="ul3">
     <span class="author" data-bind="text: nickname, visible: !editable(), click: editComment">
    </span>
     <input type="text" data-bind="value: nickname, visible: editable()"/>:
     <div>  

     <span class="comment" data-bind="text: newMsg, visible: !editable(), click: editComment">    
     </span>
     <textarea class="myComment" type="text" data-bind="value: newMsg, visible: editable()">                       
    </textarea>

    </div>
     <button data-bind="click: editComment, text: editable() ? 'Save' : 'Edit comment'">           
     </button> 
     <button data-bind="click: deleteComment">Delete</button>
          </li>
       </ul>
    </div>

这是我的javascript:

And here is my javascript:

      function Comment() {
    var self = this;
    self.nickname = ko.observable();
    self.newMsg = ko.observable();
    self.editable = ko.observable(false);

    self.sendEntry = function () {
     vm.selectedComment(new Comment());

        if (self.newMsg() !== "" && self.nickname() !== "") {

            $.post(writeUrl, "entry=" + ko.toJSON(self));
            self.newMsg("");
        }
        vm.cSection().getNewEntries();
    };
    self.deleteComment = function () {
        vm.comments.remove(self);
    };

     self.editComment = function () {
        self.editable(!self.editable());
    };
}
function commentSection() {
    var self = this;
    self.timestamp = 0;
     var entry;
    self.getNewEntries = function () {

        $.getJSON(readUrl, "timestamp=" + self.timestamp, function (comments) {
            for (var i = 0; i < comments.length; i++) {
                 entry = comments[i];
                if (entry.timestamp > self.timestamp) {
                    self.timestamp = entry.timestamp;
                }
                vm.comments.unshift(entry);
            }
             self.getNewEntries();
        });
    };

}

function ViewModel(){
    var self = this;

    self.cSection=ko.observable(new commentSection());
    self.comments = ko.observableArray();
    self.selectedComment = ko.observable(new Comment());

    //self.cSection().getNewEntries();
}
var vm=new ViewModel();
ko.applyBindings(vm);
vm.cSection().getNewEntries();

});

推荐答案

我从您的代码中获得了一些好处，现在切换正常.

I made it something from your code now toggle is working fine .

请找到此 工作小提琴

查看:

<input type="button"
    data-bind="click: editComment, value:editable() ? 'Save' : 'Edit comment'" /> 

查看模型:

$(document).ready(function() {
    vm = function ViewModel() {
        var self = this;
        self.comments = ko.observableArray();
        function Comment() {
            var self=this;
            self.editable = ko.observable(false);
            self.editComment = function() {
                self.editable(!self.editable());
            };
        }
        self.comments.push(new Comment());  
    };
    ko.applyBindings(new vm);
});

如果问题仍然存在，请利用上面的小提琴并尝试在其中构建您的代码，让我知道.

If issue still exists please make use of above fiddle and try to build your code in it let me know .

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