angular.js - How does angularjs detect whether multiple items are selected and collect the id of the row data where they are located?

Question

I know that jquery can operate the dom to check and then obtain it. But I just learned angularjs and I don’t know much about it. As follows:
This is in thead

<td><input type="checkbox" ng-model="selectAll">

This is on tbody:

<td><input ng-checked="selectAll" value="{{ x.id }}" name="beDel" type="checkbox"/></td>

This is the icon:

My question is: How to determine whether these checkboxes are selected and put the selected values ​​into a collection?

Teach me if you are proficient in angularjs.

Answer 1

I just have experience, so let me think about it differently:
1: The select all button is a checkbox, and the other sub-buttons are lists of multiple checkboxes;
2: The checkbox of the sub-button is also bound to the checked value of the object when repeating (the default is / Does not exist/i.e. flase/i.e. not selected)
3: Add two extension methods to the array

（1）：// 设置元素及子元素的选择状态（可关联自身所有子级）
    Array.prototype.setCheck = function (value, children) {
      var set_check = function (main) {
        for (var i = 0; i < main.length; i++) {
          main[i].checked = value;
          if (children && main[i][children]) {
            set_check(main[i][children]);
          }
        }
      };
      set_check(this);
    };
    
 （2）：// 将元素中所有级别子元素中被选中的元素的id打包为一个数组
    Array.prototype.checked = function (children, id_key) {
    
      var ids = [];
      var find_check;
    
      if (arguments.length < 2) {
        find_check = function (main) {
          for (var i = 0; i < main.length; i++) {
            if (main[i].checked) {
              ids.push(main[i].id);
            };
            if (!!children && main[i][children]) {
              find_check(main[i][children]);
            }
          }
        };
      } else {
        find_check = function (main) {
          for (var i = 0; i < main.length; i++) {
            if (main[i].checked) {
              ids.push(main[i][id_key]);
            };
            if (!!children && main[i][children]) {
              find_check(main[i][children]);
            }
          }
        };
      };
    
      find_check(this);
      return ids;
    };

4: Bind the extension event (1) to the select all button, and use the extension event (2) to get the id of the selected element

Demo:

// js
$scope.list = [
    {
        id: 1,
        children: [...]
    }, {
        id: 2,
        children: [...]
    },
    ...
];

< !-- html/check-all -- >
<label>
    <input class="check-all" 
           type="checkbox"
           ng-model="check_all"
           ng-change="list.setCheck(check_all, 'children')">
    <span></span>
</label>

< !-- html/check-item -- >
<li class="checkbox" ng-repeat="item in list">
     <label>
        <input type="checkbox" 
               name="item[{{ $index }}]" 
               ng-model="item.checked"
               ng-change="item.children.setCheck(item.checked, 'children')"> 
               < !-- 如果是只有一级数据的话，此处无需再绑定自身子级 -- >
     </label>
</li>

Get the selected value:

// 一级数据
$scope.checked_ids = $scope.list.checked(); // return [1,32,4,...]
// 多级别数据
$scope.checked_ids = $scope.list.checked('children'); // return [1,32,4,...]

// 如果需要转字符串
$scope.checked_ids = $scope.list.checked('children').join(','); // return "1,32,4"

Answer 2

http://stackoverflow.com/questions/12648466/how-can-i-get-angular-js-checkboxes-with-select-unselect-all-functionality-and-i

http://stackoverflow.com/questions/14514461/how-to-bind-to-list-of-checkbox-values-with-angularjs