unable to parse bindings for nested knockout bindi

2019-05-25 07:14发布

站内问答 / 后端开发
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I created two sub divs inside main div and based on radio button selection, div is shown and hidden. Now , inside one of the sub div i created one dropdown and used foreach binding to populate it.Now when i am running , list of items are coming but show and hide functionality stopped working and in console it is shown as "unable to parse binding" of foreach. Kindly help me in resolving the issue. sample code is present below :

HTML FILE

<body>
<div id="selectdiv">
    <input type="radio" id="radio1" name="radioGrp" />div1
    <input type="radio" id="radio2" name="radioGrp" />div2
</div>
<div id="myDiv" name="myDiv"   class="myDiv" style="font-family: Helvetica; font-size: 12pt; border: 1px solid black;">
  <div id="subDiv1" name="subDiv1"  data-bind="visible:subDiv1" class="subDiv1" style="color: #FF0000; border: 1px dotted black;">
    <h5>Section 1</h5>
    <p>MONTHS...</p>
    <div id="tabContainer">
        <ul data-bind="foreach: months">
            <li>
                <b data-bind="text: $data"></b>
            </li>
        </ul>
    </div>  
  </div>
  <br />
  <div id="subDiv2" name="subDiv2"  data-bind="visible:subDiv2" class="subDiv2" style="color: #FF00FF;border: 1px dashed black;">
    <h5>Section 2</h5>
    <p>This paragraph would be your content paragraph...</p>
    <p>Here's another content article right here.</p>
  </div>
</div>
</body>

JS FILE

$(document).ready(function() {
    alert("ready");
    var divdispalyViewModel1 = { 
        subDiv1: ko.observable(true)
    };
    var divdispalyViewModel2 = { 
        subDiv2: ko.observable(true)
    };
    ko.applyBindings({
        months:[ 'Jan', 'Feb', 'Mar', 'etc' ]
    });
   // alert("ready2");
    ko.applyBindings(divdispalyViewModel1);
    ko.applyBindings(divdispalyViewModel2);    
    $('#radio1').click(function () { 
        alert("radio 1");
        divdispalyViewModel1.subDiv1(true);
        divdispalyViewModel2.subDiv2(false);

    });
    $('#radio2').click(function () { 
        alert("radio2");
        divdispalyViewModel1.subDiv1(false);
        divdispalyViewModel2.subDiv2(true);

    });
 });

Month list is fetched from method present in second javascript but how html will get to know that month is binded to second javascript...i mean to say, suppose my first javascript is like below :              $(document).ready(function() {
alert("ready");
    var vm = function () {
        var self = this;
        self.subDiv1 = ko.observable(false);
        self.subDiv2 = ko.observable(false);
        var subDemoMainObj=new subDemoMain();
        subDemoMainObj.getMonths();
        //self.months = ko.observableArray(['Jan', 'Feb', 'Mar', 'etc']);
    };
    ko.applyBindings(new vm());
    ko.applyBindings(subDemoMainObj, $('#tabContainer')[0]);
 });                                                                 Second javascript is as below                                          function(ko){

alert("ready1");
    var getMonths = function () {
        var self = this;
        self.months = ko.observableArray(['Jan', 'Feb', 'Mar', 'etc']);
    };

    // alert("ready2");
    //ko.applyBindings(new getMonths());`enter code here`
},                                                                    i am expecting something like this but not understanding where i am going wrong :( 
:(

1条回答
三岁会撩人
2楼-- · 2019-05-25 07:31
  1. First of all calling applyBinding multiple times is wrong. There should be only one call per element and since you are not passing any element parameter it will be bound to body.
  2. if you are using multiple view models you need to use with biding to pick that vm however in your case you dont need those view models (divdispalyViewModel1 & divdispalyViewModel2)
  3. Then you dont need to handle the click event and change the values of the subDiv1, this is exactly what ko addresses.

in all this is how you could do it

$(document).ready(function () {
    alert("ready");
    var vm = function () {
        var self = this;
        self.subDiv1 = ko.observable(false);
        self.subDiv2 = ko.observable(false);

        self.months = ko.observableArray(['Jan', 'Feb', 'Mar', 'etc']);
    };

    // alert("ready2");
    ko.applyBindings(new vm());

});

html:

<body>
    <div id="selectdiv">
        <input type="radio" id="radio1" name="radioGrp" value='div1' data-bind="checked:subDiv1" />div1
        <input type="radio" id="radio2" name="radioGrp" value='div2' data-bind="checked:subDiv1" />div2</div>
    <div id="myDiv" name="myDiv" class="myDiv" style="font-family: Helvetica; font-size: 12pt; border: 1px solid black;">
        <div id="subDiv1" name="subDiv1" data-bind="visible:subDiv1()=='div1'" class="subDiv1" style="color: #FF0000; border: 1px dotted black;">
             <h5>Section 1</h5>

            <p>MONTHS...</p>
            <div id="tabContainer">
                <ul data-bind="foreach: months">
                    <li> <b data-bind="text: $data"></b>

                    </li>
                </ul>
            </div>
        </div>
        <br />
        <div id="subDiv2" name="subDiv2" data-bind="visible:subDiv1()=='div2'" class="subDiv2" style="color: #FF00FF;border: 1px dashed black;">
             <h5>Section 2</h5>

            <p>This paragraph would be your content paragraph...</p>
            <p>Here's another content article right here.</p>
        </div>
    </div>
</body>

Your drop down doesn't work, that's different issue (css?)

Here is the jsFiddle

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