KnockoutJS多个数据绑定 - 值和javascript函数

时间:2013-08-09 08:23:42

标签: javascript mvvm knockout.js

我想在我的视图上有多个数据绑定,所以我的文本框包含正确的值,当值更改时,它调用一个函数。基本上我想在每次表单上的值更改时使用amplify.js本地存储。

代理商视图

<section class="view">
    <header>
        <button class="btn btn-info btn-force-refresh pull-right"
            data-bind="click: refresh">
            <i class="icon-refresh"></i>Refresh</button>

               <button class="btn btn-info"
            data-bind="click: save">
            <i class="icon-save"></i>Save</button>

        <h3 class="page-title" data-bind="text: title"></h3>
        <div class="article-counter">
            <address data-bind="text: agency().length"></address>
            <address>found</address>
        </div>
    </header>

    <table>
        <thead>
            <tr>
                <th>Agency Name</th>
                <th>Category</th>
                <th>URL</th>
                <th>Number of employees</th>
            </tr>
        </thead>
        <tbody data-bind="foreach: agency">
            <tr>
                <td>
                    <!--<input data-bind="value: agencyName" /></td>-->
                  <input data-bind="value: agencyName, onchange: test()"/>
                <td>
                    <input data-bind="value: category" /></td>
                <td>
                    <input data-bind="value: Url" /></td>
                <td>
                    <input data-bind="value:numberOfEmployees" /></td>
            </tr>
            <tr>
                <td>Activities</td>
                <td>Declared Billings</td>
                <td>Campaigned Billings</td>
            </tr>
            <tr>
                <td>
                    <input data-bind="value: activities" /></td>
                <td>
                    <input data-bind="value: declaredBillings" /></td>
                <td>
                    <input data-bind="value: campaignBillings" /></td>
            </tr>
        </tbody>
    </table>
</section>

代理商ViewModel

define(['services/datacontext'], function (dataContext) {

    //var myStoredValue = amplify.store("Agency"),
    // myStoredValue2 = amplify.store("storeExample2"),
    // myStoredValues = amplify.store();

    var agency = ko.observableArray([]);
    var initialized = false;

    var save = function (agency) {
        return dataContext.saveChanges(agency);
    };

    var vm = { // This is my view model, my functions are bound to it. 
        //These are wired up to my agency view
        activate: activate,
        agency: agency,
        title: 'agency',
        refresh: refresh, // call refresh function which calls get Agencies
        save: save

    };
    return vm;

    function activate() {
        if (initialized) {
            return;
        }

        initialized = true;

        return refresh();

    }

    function refresh() {
        return dataContext.getAgency(agency);   
    }

    function test() {
        alert("test");
    }
});

每次输入新值时,例如

  <input data-bind="value: agencyName, onchange: test()"/>

我想解雇功能测试。然后,我想将视图模型的最新数据存储到本地存储中。

有谁知道如何为此做多个绑定?

2 个答案:

答案 0 :(得分:1)

您应该使用此绑定:

<input data-bind="value: agencyName, event: { change: $parent.onAgencyNameChanged}"/>

请注意,我使用$ parent来引用vm对象。

并为viewModel添加处理程序。

var vm = {  
    ....
    onAgencyNameChanged: function(agency){
       // do stuff
   }
};    
return vm;

另一种解决方案可能是订阅所有代理商的agencyName。但我认为这不适合这种情况。创建vm后,您可以这样做:

ko.utils.arrayForEach(vm.agency(), function(a){
    a.agencyName.subscribe(function(){
    // do stuff
    });
});

我希望它有所帮助。

答案 1 :(得分:0)

尝试为您必须绑定的每个元素手动订阅对象。

查看淘汰文档here中的解释和示例。