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I am trying to bind a jqxDropDownList selected value with a ko.observable and I can't figure out what is wrong. It is working with regular <select> tags and it is not working with <div> element, as I am showing in the HTML bellow. I need to replace <select> with jqwidgets dropdownlist and bind accordingly as stated in the working code.

ViewModel:

var viewModel = function(){
    var self = this;
    self.patternSelectedIndex = ko.observable(0);
    self.windowSelectedIndex = ko.observable(0);
    self.colorSelectedIndex = ko.observable(0);
    self.hardwareSelectedIndex = ko.observable(0);
    self.selectedMake = ko.observable();
    self.selectedType = ko.observable();

    self.makes = [
            {id:1, name: 'Northwoods Prestige', dimensions:true},
            {id:2, name: 'Forest Bay', dimensions:true},
            {id:3, name: 'Timberland', dimensions:true}
    ];
    self.types = [
            {id: 1, make:1, name:'Special Reserve 138', patterns:[{file:'FB_Classic', name:'FB Clasic'},{file:'FB_Long', name:'FB Long'},{file:'FB_Flush', name:'FB Flush'}], colors:[{file:'Brown', name:'Brown'},{file:'Oak', name:'Oak'},{file:'Cherry', name:'Cherry'},{file:'Green', name:'Green'}], windows:[{file:'Cascade', name:'Cascade'},{file:'LongPanel', name:'LongPanel'},{file:'Plain', name:'Plain'},{file:'Savanna', name:'Savanna'},{file:'Sunburst', name:'Sunburst'},{file:'Sherwood', name:'Sherwood'}], hardware:[{file:'hardware1', name:'Strap Hinge'},{file:'hardware2', name:'Door Stud'},{file:'hardware3', name:'Lift Handle'}]},
            {id: 2, make:1, name:'Special Reserve II', patterns:[{file:'SR_81', name:'SR 81'}], colors:[{file:'Almond', name:'Almond'},{file:'White', name:'White'}], windows:[{file:'Heritage', name:'Colonial'},{file:'Cascade', name:'Cascade'}], hardware:[{file:'hardware1', name:'Strap Hinge'},{file:'hardware3', name:'Lift Handle'}]},
            {id: 3, make:2, name:'TF 138', patterns:[{file:'Rec_Carraige', name:'Rec Carraige'}], colors:[{file:'Green', name:'Green'}, {file:'Sepia', name:'Sepia'}], windows:[{file:'Cathedral', name:'Cathedral'},{file:'Cascade', name:'Cascade'}], hardware:[{file:'hardware1', name:'Strap Hinge'},{file:'hardware3', name:'Lift Handle'}]},
            {id: 4, make:2, name:'TF II', patterns:[{file:'Raised_Carriage', name:'Raised Carriage'}], colors:[{file:'Almond', name:'Almond'}], windows:[{file:'Cathedral', name:'Cathedral'},{file:'Cascade', name:'Cascade'}], hardware:[{file:'hardware1', name:'Strap Hinge'},{file:'hardware3', name:'Lift Handle'}]},
            {id: 5, make:3, name:'RP 25', patterns:[{file:'FB_Classic', name:'FB Classic'}], colors:[{file:'Cherry', name:'Cherry'}], windows:[{file:'Cathedral', name:'Cathedral'},{file:'Cascade', name:'Cascade'}], hardware:[{file:'hardware1', name:'Strap Hinge'},{file:'hardware3', name:'Lift Handle'}]},
            {id: 6, make:3, name:'LP 25', patterns:[{file:'FB_Long', name:'FB Long'}], colors:[{file:'Green', name:'Green'}], windows:[{file:'Cathedral', name:'Cathedral'},{file:'Cascade', name:'Cascade'}], hardware:[{file:'hardware1', name:'Strap Hinge'},{file:'hardware3', name:'Lift Handle'}]}
    ];
    self.doorTypes = ko.computed(function(){
        return ko.utils.arrayFilter(self.types, function(item){
            return item.make === self.selectedMake();
        });
    });
    self.matchingTypes = ko.computed(function () {
        return ko.utils.arrayFilter(self.doorTypes(), function (item, index) {
            return item.id === self.selectedType();
        });
    }); 
};
var model = new viewModel();
ko.applyBindings(model);

(not working): In the bellow markup there is no way of binding the value with selectedMake as in the working example *2.

<div id="make" data-bind="jqxDropDownList: {source: makes, autoDropDownHeight: true, height: 25, width: 200, displayMember : 'name'}"></div>

2* HTML (working):

<select id="make" class="form-control select pull-left" data-bind="options: makes, value: selectedMake, optionsText : 'name', optionsValue : 'id'"></select>

Please take a look: jsfiddle.net/euto6vmj

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1 に答える 1

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jqxknockout は配列インデックスによるアイテムの選択のみをサポートしているように見えるため、現在選択されているインデックスを取得する関数を追加する必要があります。selectedMake および selectedType オブザーバブルと同期して、選択されたインデックスを取得する 2 つの関数を次に示します。

self.selectedMakeIndex = ko.computed(function() { 
    return self.makes.map(function(e) { return e.id; }).indexOf(self.selectedMake());
});

self.selectedTypeIndex = ko.computed(function() { 
    return self.types.map(function(e) { return e.id; }).indexOf(self.selectedType());
});

selectedMake() オブザーバブルを設定するたびに、これらは自動的に更新されます。データバインドで使用するだけです：

<div id="make" data-bind="jqxDropDownList: {source: makes, autoDropDownHeight: true, height: 25, width: 200, displayMember : 'name', selectedIndex: selectedMakeIndex }"></div>

... タイプについても同様です。

更新された jsfiddle: http://jsfiddle.net/euto6vmj/1/

于 2015-06-29T19:17:20.060 に答える