绑定输入和非输入数字内容以计算一系列值

Question

I was looking for some assistance. 我正在寻找帮助。 I am very new to Angular, but I have searched and haven't been able to find an answer. 我是Angular的新手，但是我已经搜索过，但是找不到答案。 The basic situation is that I have 5 input boxes. 基本情况是我有5个输入框。 As these are changed the data in a table changes. 随着这些更改，表中的数据也会更改。 However, I have a row of data that is dependent on the prior cell, so if A = 1, B = A + 2, C = B +1, etc. I would prefer not to repeat all the crazy math I have to get the number for cell A. I have tried adding ng-model to the html cells (which of course has no affect once the page is first initialized. Is there a way to bind a cell's contents to the prior cell's contents without having an input of some kind? Thanks! 但是，我有一行数据取决于前一个单元格，因此，如果A = 1，B = A + 2，C = B +1，依此类推。我宁愿不重复我必须得到的所有疯狂数学我已经尝试将ng-model添加到html单元格中（当然，在首次初始化页面后，这当然没有任何影响。是否可以将单元格的内容绑定到先前单元格的内容，而无需输入有点吗？

Here is a sample of what I'm trying to do in code form: 这是我尝试以代码形式进行操作的示例：

<input type="text" ng-model="value1"><br>
<input type="text" ng-model="value2"><br>

<p ng-model="value3">{{value1 + value2}}</p>
<p>{{value 3 + value1}}</p>

This is a very simplified version, but the gist is there. 这是一个非常简化的版本，但要旨在那里。 (so no it isn't as simple as having the 2nd <p> be {{value3 + 2 * value1 + value2}} ) （所以不像第2个<p>是{{value3 + 2 * value1 + value2}} ）

Answer 1

You could have a function that is called when ng-change on each of the inputs happens. 您可能有一个在每个输入上发生ng-change时调用的函数。 You should avoid having logic/arithmetic in the view.. 您应该避免在视图中使用逻辑/算术。

Then you can have this function in the controller of the page or element and call it like 然后，您可以在页面或元素的控制器中使用此函数，然后像调用它一样

<input type="text" ng-change="ctrl.myFunc(value1,value2)"/>

for both inputs. 对于两个输入。

Edit: By the way there is no ng-model for p tag!! 编辑：顺便说一句，没有p标签的ng模型！ you need to make that a readonly input instead if you want to use it for other subsequent value caluclation. 如果要将其用于其他后续值计算，则需要将其设置为只读输入。 http://docs.angularjs.org/api/ng/directive/ngModel http://docs.angularjs.org/api/ng/directive/ngModel

Edit 2: Alternatively you can use value="{{value1 + ... }}" in your inputs like (given your example): 编辑2：或者，您也可以在输入中使用value="{{value1 + ... }}" ，例如（根据您的示例）：

<input type="text" ng-model="A" value="0"/>
<input type="text" ng-model="B" value="{{A + 2}}"/>
<input type="text" ng-model="C" value="{{B + 1}}"/>

Edit 3: 编辑3：

Here is the full solution: (also in plunkr to see it in action: http://plnkr.co/edit/FXAae6mjOGOfw2Xczlb1 ) Keep in mind that having everything in $scope is a bad practice for bigger applications and also <br/> 's shouldn't be used. 这里是完整的解决方案：（也可以在plunkr中查看它的运行方式： http ://plnkr.co/edit/FXAae6mjOGOfw2Xczlb1）请记住，将$ scope中的所有内容用于大型应用程序都是不好的做法，而且<br/>不应使用。 This is an example just for illustration purposes :) 这是一个仅用于说明目的的示例：）

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Example</title>


  <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.5/angular.min.js"></script>



</head>
<body ng-app="bindExample">
  <script>
  angular.module('bindExample', [])
    .controller('ExampleController', ['$scope', function($scope) {
      $scope.calculate = function() {
          if (!$scope.noninput) $scope.noninput = [];
          if (!$scope.value) $scope.value = [];
          $scope.noninput[0] =  parseInt($scope.value[0]) + parseInt($scope.value[1]) || 0;
          $scope.value[2] = $scope.noninput[0]+100;
      };
    }]);
</script>
<div ng-controller="ExampleController">
  1st Value  plus: <input type="text" ng-model="value[0]" value="{{value[0]}}" ng-change="calculate()"/><br/>
  2nd Value: <input type="text" ng-model="value[1]" value="{{value[1]}}" ng-change="calculate()"/><br/>
  Non input result: <span ng-bind="noninput[0]">{{noninput[0]}}</span><br/>
  Value 3nd (non-input result plus 100): <input type="text" ng-model="value[2]" value="{{value[2]}}"/><br/>
  <br/>
  Model:<br/>
  (Input Values): {{value}}<br/>
  (Non Input Values): {{noninput}}<br/>
</div>
</body>
</html>

绑定输入和非输入数字内容以计算一系列值

问题描述

1 个解决方案

解决方案1
1 已采纳 2015-02-25 16:19:42

绑定输入和非输入数字内容以计算一系列值

问题描述

1 个解决方案

解决方案1 1 已采纳 2015-02-25 16:19:42

解决方案1
1 已采纳 2015-02-25 16:19:42