剔除多选 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 multiple 的选择.对于选择中的每个选项，我想要设置标题属性(显示工具提示).我还想将选定的选项作为对象数组进行检索.我设法得到了我想要的东西，除了选定的选项不返回对象数组而是返回 valueTexts 数组.我不知道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.

这是我目前得到的代码:

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/

我需要添加或更改什么才能使 selectedOptions 数组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

像这样试试你的 html

Try your html like this

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

演示

查看控制台输出

要向选项添加属性，您需要使用 optionsAfterRender.
这仅在版本 3.1.0 中可用.我注意到你的小提琴使用的是 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

参考资料

见注2

这篇关于剔除多选 selectedOptions 包含值而不是对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！