使用剔除按可观察的数组按输入按钮的值 [英] Push the values of input button in an observable array using knockout
问题描述
我正在尝试完成一个任务,在该任务中,我选择按钮的值,然后使用两种方式进行数据绑定以打印它们.我的起始代码是:
I am trying to complete a task where I choose the values of buttons and then using two way data binding I print them. My starting code is:
<table class="table">
<tr>
<td><input type="button" value="1" data-bind="click: addNumber"></td>
<td><input type="button" value="2" data-bind="click: addNumber"</td>
<td><input type="button" value="3" data-bind="click: addNumber"></td>
<td><input type="button" value="4" data-bind="click: addNumber"></td>
<td><input type="button" value="5" data-bind="click: addNumber"></td>
<td><input type="button" value="6" data-bind="click: addNumber"></td>
<td><input type="button" value="7" data-bind="click: addNumber"></td>
<td><input type="button" value="8" data-bind="click: addNumber"></td>
<td><input type="button" value="9" data-bind="click: addNumber"></td>
<td><input type="button" value="10" data-bind="click: addNumber"></td>
</tr>
</table>
我的视图模型是:
function viewModel(){
var self = this;
self.column = ko.observableArray();
self.addNumber = function() {
self.column.push(...);
console.log(self.column());
}
}
ko.applyBindings(new viewModel());
我不知道如何编写addNumber
函数来执行任务,即当我单击按钮时,其值会被推入列数组中.
I don't know how to write the addNumber
function to do the task which is when I click on a button its value gets pushed in the column array.
推荐答案
用于click
bindin的函数将获取上下文数据作为参数.看起来您还是在渲染数字列表,因此您可能也应该使用foreach
.像这样:
A function for a click
bindin will get the contextual data as arguments. It looks like you're rendering a list of numbers anyways, so you should probably use foreach
too. Something like this:
function viewModel(){
var self = this;
self.nrs = ko.observableArray([1,2,3,4,5,6,7,8,9,10]);
self.column = ko.observableArray();
self.addNumber = function(data) {
self.column.push(data);
console.log(self.column());
}
}
ko.applyBindings(new viewModel());
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
Column: <strong data-bind="text: column"></strong>.
<table class="table">
<tbody data-bind="foreach: nrs">
<tr>
<td><input type="button" data-bind="value: $data, click: $parent.addNumber"></td>
</tr>
</tbody>
</table>
如果您想更贴近原始代码,也可以.然后,您必须使用匿名函数(例如:
If you want to stick closer to your original code that's possible too. Then you have to tell knockout what argument to pass, using an anonymous function, e.g.:
<td>
<input type="button" value="1" data-bind="click: function() { addNumber(1); }">
</td>
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