我是Angularjs的新手,这是我在论坛上发表的第一篇文章,但我尝试了很长时间才能使用angularjs创建动态矩阵。经过一些研究后,我不确定通过使用Angularjs我真正想要做什么。让我给你看一张可以解释我期望的图片:
例如,对于这张图片,我想创建这个JSON对象:
{
"row1": {
"column1": 0,
"column2": 1,
"column3": 2
}
"row2": {
"column1": 2,
"column2": 0,
"column3": 3
}}
当然,我们可以添加一个新列或一个具有不同名称的新行,这就是为什么它是动态的。目前我在代码方面有这个:
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script
src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<script src="js/addMatrix.js"></script>
</head>
<body>
<div ng-app="App" ng-controller="MainCtrl">
<p>Add a new element :</p>
<table>
<tr>
<td data-ng-repeat="data in texts">
<button>{{data.text}}</button>
</td>
<td data-ng-repeat="field in fields">
<form ng-submit="submit(text)">
<input type="text" ng-model="text" name="text"
placeholder="New Category" />
</form>
</td>
<td>
<button ng-click="addNewChoice()">+</button>
</td>
</tr>
</table>
<div ng-if="texts.length > 0 && hasMatrix">
<table>
<tr>
<td>
<p></p>
</td>
<td data-ng-repeat="column in columns">{{column.id}}</td>
</tr>
<tr data-ng-repeat="row in rows">
<td>{{row.id}}</td>
<td data-ng-repeat="column in columns">
<select name="singleSelect">
<option>0</option>
<option>1</option>
<option>2</option>
<option>3</option>
</select>
</td>
</tr>
</table>
<br/>
<button ng-click="addColumn()">Add a column</button>
<button ng-click="addRow()">Add a row</button>
<button>Validate</button>
<br /> <br />
<form ng-submit="process(data)" ng-if="hasClicked">
name : <input type="text" ng-model="data" name="data"
placeholder="name" />
</form>
</div>
<div ng-if="texts.length > 0 && !hasMatrix">
<button ng-click="create()">Create a new Matrix</button>
</div>
<div ng-if="firstRowColumn">
<form>
First row's name : <input type="text" ng-model="matrix.row"
name="row" placeholder="New Category" /><br /> First Column's name
: <input type="text" ng-model="matrix.column" name="column"
placeholder="New Category" /><br /> <input type="submit"
ng-click="createFirst(matrix)" value="generate" />
</form>
</div>
</div>
</body>
</html>
Angularjs
var myApp = angular.module('App', []);
myApp.controller('MainCtrl',function ($scope) {
$scope.fields=[];
$scope.texts=[];
$scope.hasMatrix = false;
$scope.hasClicked = false;
$scope.firstRowColumn = false;
$scope.hasNewRow = false;
$scope.hasNewColumn = false;
$scope.rows=[];
$scope.columns=[];
$scope.test = {
singleSelect: null,
};
$scope.addNewChoice = function() {
var newItem = $scope.fields.length + 1;
if (newItem < 2) {
$scope.fields.push({'id' : 'field' + newItem});
}
};
$scope.process = function(data) {
if ($scope.hasNewRow) {
$scope.rows.push({'id' : data});
}
if ($scope.hasNewColumn) {
$scope.columns.push({'id' : data});
}
$scope.hasNewColumn = false;
$scope.hasNewRow = false;
$scope.hasClicked = false;
};
$scope.addRow = function() {
$scope.hasClicked = true;
$scope.hasNewRow = true;
};
$scope.addColumn = function() {
$scope.hasClicked = true;
$scope.hasNewColumn = true;
};
$scope.create = function(field) {
$scope.input = field;
};
$scope.submit = function(text) {
var lastItem = $scope.fields.length - 1;
$scope.fields.splice(lastItem);
$scope.texts.push({'text' : text});
};
$scope.create = function() {
$scope.firstRowColumn = true;
};
$scope.createFirst = function(matrix) {
$scope.firstRowColumn = false;
$scope.hasMatrix = true;
$scope.rows.push({'id' : matrix.row});
$scope.columns.push({'id' : matrix.column});
}
});
如果有人能帮助我,那就太好了。谢谢
答案 0 :(得分:3)
你可以,它非常适合角度模型。我在下面实现了一个非常简单的版本,它将矩阵表示为数字数组的数组,并使用第一行(必须始终存在)来确定列数;您可以将其扩展为更适合您的用例的内容。
下面的代码有2个问题:
ng-model
使用row[$index]
,而不是看似等效的cell
ng-repeat
使用track by $index
对于ng-model="row[$index]"
,这是由于Angular中的双向绑定如何工作:您必须引用一个对象(行数组)而不是一个基元,以便它可以检测更新。您可以在this SO中找到详细信息。
对于ng-repeat="... track by $index"
,这是为了避免“欺骗”错误。 ng-repeat
需要一种方法来跟踪正在迭代的集合的唯一元素;如果你正在迭代一组对象,Angular知道该怎么做(注意我在迭代行时不需要这样做,因为每一行都是一个数组,这是JS中的一种对象);否则,你需要告诉它是什么使每个元素都是唯一的(在这种情况下,它在集合中的位置,由$index
提供)。您可以在this Angular docs page中找到更多详细信息。
angular.module('App', [])
.controller('MainCtrl', ['$scope', function($scope) {
$scope.matrix = [[0]];
$scope.addColumn = function() {
$scope.matrix.forEach(function(row) {
row.push(0);
});
};
$scope.addRow = function() {
var columnCount = $scope.matrix[0].length;
var newRow = [];
for (var i = 0; i < columnCount; i++) {
newRow.push(0);
}
$scope.matrix.push(newRow);
};
$scope.deleteRow = function(idx) {
if (idx >= 0 && idx < $scope.matrix.length) {
$scope.matrix.splice(idx, 1);
}
};
$scope.deleteColumn = function(idx) {
if (idx >= 0 && idx < $scope.matrix[0].length) {
$scope.matrix.forEach(function(row) {
row.splice(idx, 1);
});
}
};
}]);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.js"></script>
<div ng-app="App" ng-controller="MainCtrl">
<table>
<tbody>
<tr>
<th></th>
<th ng-repeat="column in matrix[0] track by $index">
<button ng-disabled="matrix[0].length <= 1"
ng-click="deleteColumn($index)">
Delete
</button>
</th>
</tr>
<tr ng-repeat="row in matrix">
<th>
<button ng-disabled="matrix.length <= 1"
ng-click="deleteRow($index)">
Delete
</button>
</th>
<td ng-repeat="cell in row track by $index">
<input type="number" ng-model="row[$index]">
</td>
</tr>
</tbody>
</table>
<button type="button" ng-click="addRow()">Add Row</button>
<button type="button" ng-click="addColumn()">Add Column</button>
<h3>As JSON:</h3>
<pre><code>{{matrix | json}}</code></pre>
</div>
答案 1 :(得分:0)
Angularjs:使用数据条目表创建动态JSON obj数组。
步骤:显示一些输入类型示例。
$uploadArtwork = $_FILES['asset_name']['tmp_name'];
if($uploadArtwork == null) {
$sql = "";
}
else {
$sql = "";
}
var app = angular.module("myApp", []);
app.controller('myCtrl', function($scope) {
$scope.vendorTypeEnums = [
'main',
'sub'
];
$scope.brand ="brandX";
$scope.vendorDataList = [];
$scope.initVendorList = function(vendorsCount) {
$scope.vendorDataList = [];
for (var i = 0; i < vendorsCount; i++) {
$scope.createVendorObj();
}
console.log($scope.vendorDataList);
}
$scope.createVendorObj = function() {
var row = {
vendorName: '',
brand: $scope.brand,
vendorType: '',
layerLevel: 0,
};
$scope.vendorDataList.push(row);
};
$scope.addVendorData = function() {
console.log($scope.vendorDataList);
alert(JSON.stringify($scope.vendorDataList));
};
});