Question

我有以下内容：

<div data-bind="liveEditor: PropertyNameINeed"></div>

如何使用jQuery获取名称“PropertyNameINeed”？

有没有比那个更好的解决方案？ https://www.wimpyprogrammer.com/get-bound-property-name-in-a-knockoutjs-custom-binding/

感谢您的帮助。

Answer 1

希望这对你有用，

Rails.application.config.assets.precompile = ['*.js', '*.css', '*.css.scss']

Answer 2

我真的不明白为什么你需要这样做，但它仍然是一个有趣的问题需要解决。

我想到了一个解决方案，涉及“扩展”你感兴趣的绑定。你必须小心不要改变它的行为......

解释我的方法的最好方法是通过一个例子：

// In this example, I want to access all properties bound via a `text` binding.
// I want to be able to retreive information about the binding using a HTMLElement

// Here, we'll store our binding information
var textBinds = [];

// This function returns an object from the `textBinds` array 
// based on a matching `element` property
var getTextBindingValueForElement = function(element) {
  return textBinds.find(function(b) {
    return b.element === element;
  });
};


// For this example we're tapping in to the `text` binding. If you're only watching
// custom bindings, it might be better to call a helper function in their init

// Store a reference to knockout's original `text` binding's `init` method:
var og = ko.bindingHandlers.text.init;

// Extend the method:
ko.bindingHandlers.text.init = function(element, valueAccessor, allBindings, vm) {
  // Loop through all of the viewmodel's properties to find the property
  // that matches the current value.
  // Note: if the value is a primitive (number, str, bool, null, etc.), this will
  // return the first match. So it ONLY WORKS FOR OBJECTS/FUNCTIONS
  var value = valueAccessor();
  var prop = Object.keys(vm).find(function(key) {
    return vm[key] === value;
  });

  // We're storing element, prop and value in a plain object
  textBinds.push({
    element: element,
    prop: prop,
    value: value
  });

  // This ensures the old behavior still works
  return og.apply(this, arguments);
};

// Now, we can access the bound `text` property via the element inside an
// ordinary jQuery click listener
$(".js-onClick").click(function() {
  var bindData = getTextBindingValueForElement(this);
  console.log("Prop: " + bindData.prop);
  console.log("Val: " + bindData.value());
});


ko.applyBindings({
  testLabel: ko.observable("Hello world")
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<div class="js-onClick" data-bind="text: testLabel"></div>

这种方法的优点：

没有正则表达式
让我们存储对数据绑定值的实际引用（示例代码中为value）。我真的不明白为什么你需要财产名称......

限制：

如果属性包含基元

在KnockoutJS绑定中获取绑定名称

2 个答案: