knockout multiselect selectedOptions包含值而不是对象 [英] knockout multiselect selectedOptions contains values instead of objects

问题描述

我有一个属性为select的select。对于select中的每个选项，我想要title属性集（显示工具提示）。我还想将所选选项检索为对象数组。我设法得到了我想要的东西，除了选择的选项不返回一个对象数组但是返回一个valueTexts数组的事实。我无法弄清楚如何在该数组中获取对象。

I have a select with the attribute multiple. For each option in the select I want the title attribute set (which shows a tooltip). I also want to retrieve the selected options as an array of objects. I managed to get what I want except for the fact that the selected options doesnt return an array of objects but an array of valueTexts. I can't figure out how I get objects in that array.

这是我到目前为止的代码：

This is the code I got so far:

HTML：

<select multiple style="width: 150px;" size=15 
        data-bind="foreach: options, selectedOptions: selectedOptions">
    <option data-bind="text: Name, attr: { 'title': Name}"></option>
</select><br />
<button data-bind="click: showSelectedOptions">Show selection</button>

Javascript：

Javascript:

function Option(id, name){
    var self = this;

    self.Id = id;
    self.Name = name;
}

function ViewModel(){
    var self = this;

    self.options = ko.observableArray([
        new Option(0, "NormalText"),
        new Option(1, "AnotherText"),
        new Option(2, "WaaaaaaaaaaaaaaaayTooLongText")
    ]);
    self.selectedOptions = ko.observableArray([]);

    self.showSelectedOptions = function(){
        alert(self.selectedOptions());
        //what I would like to have:
        //if (self.selectedOptions().length > 0)
        //    alert(self.selectedOptions()[0].Name);
    }
}

ko.applyBindings(new ViewModel());

以及用于演示的小提琴链接： http://jsfiddle.net/c63Bb/1/

And the fiddle link for demonstration: http://jsfiddle.net/c63Bb/1/

我需要添加或更改内容数组selectedOptions包含对象而不是字符串？

What do I need to add or change so the array selectedOptions contains objects instead of strings?

推荐答案

试试这样的html

<select 
    data-bind="
        options: options,
        selectedOptions : selectedOptions,
        optionsText: 'Name',
        optionsCaption: 'Choose...'
    "
 size="5" multiple="true"></select>

演示

请参阅控制台输出

要向选项添加属性，您需要使用 optionsAfterRender 。

这仅在3.1.0版中可用。我注意到你的小提琴正在使用3.0.0。

To add attributes to option you need to use optionsAfterRender.
This is available only in version 3.1.0. I noticed your fiddle is using 3.0.0.

<select 
    data-bind="
        options: options,
        selectedOptions : selectedOptions,
        optionsText: 'Name',
        optionsAfterRender: $root.setTitle
    "
 size="5" multiple="true"></select><br />
<button data-bind="click: showSelectedOptions">Show selection</button>

并创建一个函数

self.setTitle = function(option, item) {
    option.title = item.Name
}  

演示

参考

见注2

Reference

See Note 2

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