javascript - Knockout JS - 将数据绑定(bind)到我的表

Question

嗨伙计们，我对 knockout 和学习都很陌生。我设法通过 jsfiddle http://jsfiddle.net/N2zNk/49/ 重新创建了我试图在我的网站上完成的工作.我复制了代码并将其放入我的网站，唯一的区别是我通过 AJAX 从服务器获取数据。

现在发生的是，我的表格设法使用我的编辑按钮在我的表格中创建了 1 行，但没有呈现我的任何文本绑定(bind)。我相信 Ajax 的某些东西是导致我出现问题的原因，但无法弄清楚它是什么。

有人知道吗？

控制台错误信息:

Uncaught ReferenceError: Unable to process binding "text: function (){return Incident }"
Message: Incident is not defined

HTML代码:

<table class="table table-bordered table-hover text-center" id="example2">
    <thead>
        <tr>
            <th width="30" class="text-center"><i class="fa fa-list-alt fa-4"></i></th>
            <th width="75" class="text-center"> Incident <i class="fa fa-ticket"></i> </th>
            <th width="65" class="text-center"> Priorité <i class="fa fa-balance-scale"></i> </th>
            <th width="70" class="text-center"> Composante <i class="fa fa-building-o"></i> </th>
            <th width="300" class="text-center"> Description <i class="fa fa-ellipsis-h"></i> </th>
            <th width="100" class="text-center"> Date de début <i class="fa fa-calendar"></i> </th>
            <th width="100" class="text-center"> Responsable <i class="fa fa-user"></i> </th>
        </tr>
    </thead>
    <tbody data-bind="template: { name: 'Incidents', foreach: dataFromServer() }" />
    </tbody>
</table>

我的模板代码:

<script type="text/html" id="Incidents">
<tr>
    <td class='over_flow_control'><button class='edit_button btn btn-default btn-sm' type='button' value='Edit' data-bind="click: $parent.editProduct"><i class='glyphicon glyphicon-edit'></i></button></td>
    <td class='over_flow_control' data-bind="text: Incident"></td>
    <td class='over_flow_control'><h4><span class='priorité_span' data-bind="text:PrioritéValue"></span></h4></td>
    <td class='over_flow_control' data-bind="text:Composante"></td>
    <td class='over_flow_control text-left' data-bind="text:Description"></td>
    <td class='over_flow_control Date_de_début_cell' data-bind="text:Date_de_début"></td>
    <td class='over_flow_control' data-bind="text:ResponsableValue"></td>    
</tr>
</script>

我的 javascript 代码:

<script type="text/javascript">
function load_incidents(ID, Description, Composante, Incident, ÉtatValue, PrioritéValue, Duré, Date_de_début, Date_de_fin, Groupe_Support_Prime, Autres_Groupe_Support_Prime, ResponsableValue, Impact, Temps_Consacré, Type_de_tempsValue, Journal_des_actions, Dépanage, Suivi, Ressources) {
    var self = this;
    this.ID = ID;
    this.Description = ko.observable(Description);
    this.Composante = ko.observable(Composante);
    this.Incident = ko.observable(Incident);
    this.ÉtatValue = ko.observable(ÉtatValue);
    this.PrioritéValue = ko.observable(PrioritéValue);
    this.Duré = ko.observable(Duré);
    this.Date_de_début = ko.observable(Date_de_début);
    this.Date_de_fin = ko.observable(Date_de_fin);
    this.Groupe_Support_Prime = ko.observable(Groupe_Support_Prime);
    this.Autres_Groupe_Support_Prime = ko.observable(Autres_Groupe_Support_Prime);
    this.ResponsableValue = ko.observable(ResponsableValue);
    this.Impact = ko.observable(Impact);
    this.Temps_Consacré = ko.observable(Temps_Consacré);
    this.Type_de_tempsValue = ko.observable(Type_de_tempsValue);
    this.Journal_des_actions = ko.observable(Journal_des_actions);
    this.Dépanage = ko.observable(Dépanage);
    this.Journal_des_actions = ko.observable(Journal_des_actions);
    this.Suivi = ko.observable(Suivi);
    this.Ressources = ko.observable(Ressources);

    //This is the start edit group//
    this.editDescription = ko.observable(Description);
    this.editComposante = ko.observable(Composante);
    this.editIncident = ko.observable(Incident);
    this.editÉtatValue = ko.observable(ÉtatValue);
    this.editPrioritéValue = ko.observable(PrioritéValue);
    this.editDuré = ko.observable(Duré);
    this.editDate_de_début = ko.observable(Date_de_début);
    this.editDate_de_fin = ko.observable(Date_de_fin);
    this.editGroupe_Support_Prime = ko.observable(Groupe_Support_Prime);
    this.editAutres_Groupe_Support_Prime = ko.observable(Autres_Groupe_Support_Prime);
    this.editResponsableValue = ko.observable(ResponsableValue);
    this.editImpact = ko.observable(Impact);
    this.editTemps_Consacré = ko.observable(Temps_Consacré);
    this.editType_de_tempsValue = ko.observable(Type_de_tempsValue);
    this.editJournal_des_actions = ko.observable(Journal_des_actions);
    this.editDépanage = ko.observable(Dépanage);
    this.editJournal_des_actions = ko.observable(Journal_des_actions);
    this.editSuivi = ko.observable(Suivi);
    this.editRessources = ko.observable(Ressources);

    //end of the edit group//
    this.accept = function () {
    this.Description(this.editDescription());
    this.Composante(this.editComposante());
    this.Incident(this.editIncident());
    this.ÉtatValue(this.editÉtatValue());
    this.PrioritéValue(this.editPrioritéValue());
    this.Duré(this.editDuré());
    this.Date_de_début(this.editDate_de_début());
    this.Date_de_fin(this.editDate_de_fin());
    this.Groupe_Support_Prime(this.editGroupe_Support_Prime);
    this.Autres_Groupe_Support_Prime(this.editAutres_Groupe_Support_Prime());
    this.ResponsableValue(this.editResponsableValue());
    this.Impact(this.editImpact());
    this.Temps_Consacré(this.editTemps_Consacré());
    this.Type_de_tempsValue(this.editType_de_tempsValue());
    this.Journal_des_actions(this.editJournal_des_actions());
    this.Dépanage(this.editDépanage());
    this.Journal_des_actions(this.editJournal_des_actions());
    this.Suivi(this.editSuivi());
    this.Ressources(this.editRessources());
    return true;
    }.bind(this);

    //reset to originals on cancel
    this.cancel = function () {
    this.editDescription(this.Description());
    this.editComposante(this.Composante());
    this.editIncident(this.Incident());
    this.editÉtatValue(this.ÉtatValue());
    this.editPrioritéValue(this.PrioritéValue());
    this.editDuré(this.Duré());
    this.editDate_de_début(this.Date_de_début());
    this.editDate_de_fin(this.Date_de_fin());
    this.editGroupe_Support_Prime(this.Groupe_Support_Prime);
    this.editAutres_Groupe_Support_Prime(this.Autres_Groupe_Support_Prime());
    this.editResponsableValue(this.ResponsableValue());
    this.editImpact(this.Impact());
    this.editTemps_Consacré(this.Temps_Consacré());
    this.editType_de_tempsValue(this.Type_de_tempsValue());
    this.editJournal_des_actions(this.Journal_des_actions());
    this.editDépanage(this.Dépanage());
    this.editJournal_des_actions(this.Journal_des_actions());
    this.editSuivi(this.Suivi());
    this.editRessources(this.Ressources());
    }.bind(this);
}

Incidents = {
pvm: {},
productStore: {
    products: [],
    init: function (data) {
        this.products = $.map(data, function (product) {
            return new load_incidents(product.ID, product.Description(), product.Composante());
        });
        console.log(this.products);
    }
},  

init: function () {

var self = this;
dataFromServer = ko.observableArray([]);
$.getJSON("../../../../_vti_bin/listData.svc/GDI_PROD_Incidents?$filter=ÉtatValue%20ne%20%27Fermé%27&$orderby=PrioritéValue desc",
function (data) {
if (data.d.results) {
dataFromServer(JSON.stringify(data.d.results));
console.log(dataFromServer());
}
}
);
Incidents.productStore.init(dataFromServer());
},
productViewModel: function (data) {
        var self = this;
        var productsArray = [];

            productsArray = data;

        this.products = ko.observableArray(productsArray);
        this.selectedProduct = ko.observable();
        this.editProduct = function (productToEdit) {
            self.selectedProduct(productToEdit);

            // Incidents.pvm.selectedProduct(productToEdit);
        };
        this.acceptEdit = function () {
            var selected = Incidents.pvm.selectedProduct();
            if (selected.accept()) {
                Incidents.pvm.selectedProduct("");
                $('#dialogEditProduct').popup('close');
            }
        };
        this.cancelEdit = function () {
            Incidents.pvm.selectedProduct().cancel();
            Incidents.pvm.selectedProduct("");
            $('#dialogEditProduct').popup('close');
        };
    }
};
ko.bindingHandlers.jqButton = {
    init: function (element) {
        $(element).button();
    },
    update: function (element, valueAccessor) {
        var currentValue = valueAccessor();
        $(element).button("option", "disabled", currentValue.enable === false);
    }
};

ko.bindingHandlers.openProductDialog = {
    update: function (element, valueAccessor) {  
        var value = ko.utils.unwrapObservable(valueAccessor());
        if (value) {
            $.mobile.changePage("#dialogEditProduct", {
                role: 'dialog'
            });
            $("#dialogEditProduct").open();    
            // $("#dialogEditProduct").trigger('create');    
        }

    }
};

$.extend({
    isNumber: function (obj) {
        return !isNaN(parseFloat(obj)) && isFinite(obj);
    }
});

Incidents.init(); 
ko.applyBindings(Incidents);
</script>

Answer 1

看起来大部分问题是您没有正确使用 var self=this 模式。

通常的 JavaScript 构造函数如下所示:

var MyVm = function() {
  this.name = ko.observable('John');
  this.age = ko.observable(23);
}

然后你这样调用它:

var myVm = new MyVm();

当您开始添加函数时，这种模式会变得复杂，因为您必须小心 this 的绑定(bind)方式。

var MyVm = function() {
  this.name = ko.observable('John');
  this.age = ko.observable(23);
  this.incAge = function() {
    this.age(this.age()+1);
  };
}

根据您的操作方式，当您调用 incAge 时，它可能无法按预期工作，因为 this 可能与您的 View 模型不同。这就是 var self = this; 模式存在的原因。但是它是这样使用的:

var MyVm = function() {
  var self = this;
  self.name = ko.observable('John');
  self.age = ko.observable(23);
  self.incAge = function() {
    self.age(self.age()+1);
  };
  return self;
}

使用这种模式，您不必担心如何调用 incAge。

您粘贴了太多代码，因此很难看出确切的问题所在。 你应该仔细阅读:How to create a Minimal, Complete, and Verifiable example ，这也将帮助您解决自己的问题。即便如此，我可以看出您没有正确使用该模式。按照我的示例开始使用它，不要忘记不可或缺的 return self;。在您的情况下，您使用的是带参数的构造函数，这将是这样的:

var MyVm = function(_name, _age) {
  var self = this;
  self.name = ko.observable(_name);
  self.age = ko.observable(_age);
  self.incAge = function() {
    self.age(self.age()+1);
  };
  return self;
}

为了完成我的回答，我可以看到您正在将大多数属性直接映射到同名的可观察对象中。使用 knockout mapping 可以节省大量时间和代码.