使用Knockout更改自定义jquery插件的设置 [英] Change settings of custom jquery plugin using Knockout

问题描述

我创建了一个非常基本的jquery插件。只需更改div的内容即可。现在，我想使用knockoutjs动态更新该插件的设置。我似乎无法理解如何做到这一点，甚至从哪里开始。这就是我到目前为止所拥有的。

I create a very basic jquery plugin. Simply changing the with of the div. Now, I want to use knockoutjs to dynamically update the settings of that plugin. I cant seem to get my head around how to do this or even where to start. This is what I have so far.

<div class="mychart"></div>
  <input type="text" data-bind="value: chartwidth"/>
  <input type="text" data-bind="value: chartheight"/>
    <script src="jquery.js"></script>
  <script src="knockout.js"></script>
  <script src="chartjs.js"></script>
  <script>

    $(".mychart").nbchart({
      width:'200px',
      height:'200px'
    });

    // Here's my data model
    var ViewModel = function(cwidth,cheight) {
        this.chartwidth = ko.observable(cwidth);
        this.chartheight= ko.observable(cheight);
    };

    ko.applyBindings(new ViewModel("100px","100px"));

推荐答案

你能做的最简单的事情就是订阅变量：

The easiest thing you could do is subscribe to the variables:

this.chartwidth.subscribe(function (newValue) {
  $(".mychart").nbchart({width:newValue});
});

但是，你违反了Knockout的基本规则，即不要乱用DOM在绑定处理程序之外。

However, you are violating the Cardinal Rule of Knockout, which is "Don't mess with the DOM outside of a binding handler."

A 自定义绑定处理程序如下所示：

ko.bindingHandlers.nbchart = {
  init: function (element, valueAccessor) {
    $(element).nbchart();
  },
  update: function (element, valueAccessor) {
    var config = ko.unwrapObservable(valueAccessor());
    $(element).nbchart({
      width: config.width(),
      height: config.height()
    });
  }
};

你会绑定像

<div data-bind="nbchart:config"></div>

你的viewmodel有一个配置变量，如

where your viewmodel has a config variable like

var ViewModel = function(cwidth,cheight) {
    this.chartwidth = ko.observable(cwidth);
    this.chartheight= ko.observable(cheight);
    config: {
      width: this.chartwidth,
      height: this.chartheight
    }
};

最后，如果您不打算在没有Knockout的情况下使用该插件，则不需要jQuery插入。您可以将所有代码编写为自定义绑定处理程序的一部分。

Finally, if you are not planning to use the plugin without Knockout, you don't need a jQuery plugin. You can just write all the code as part of your custom binding handler.

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