Angular确实在HTML指令中提供了一些使用数字的for循环的支持:
<div data-ng-repeat="i in [1,2,3,4,5]">
do something
</div>
但是，如果作用域变量包含一个具有动态数字的范围，那么每次都需要创建一个空数组。
在控制器中
var range = [];
for(var i=0;i<total;i++) {
range.push(i);
}
$scope.range = range;
在HTML中
<div data-ng-repeat="i in range">
do something
</div>
这是可行的，但这是不必要的，因为我们在循环中根本不会使用范围数组。有人知道设置最小/最大值的范围或规则吗?
喜欢的东西:
<div data-ng-repeat="i in 1 .. 100">
do something
</div>
当前回答
迟到了。但我最后还是这样做了:
在你的控制器中:
$scope.repeater = function (range) {
var arr = [];
for (var i = 0; i < range; i++) {
arr.push(i);
}
return arr;
}
Html:
<select ng-model="myRange">
<option>3</option>
<option>5</option>
</select>
<div ng-repeat="i in repeater(myRange)"></div>
其他回答
我想出了一个更简单的版本，用于创建两个定义的数字之间的范围，例如。5至15
参见JSFiddle上的演示
HTML:
<ul>
<li ng-repeat="n in range(5,15)">Number {{n}}</li>
</ul>
控制器:
$scope.range = function(min, max, step) {
step = step || 1;
var input = [];
for (var i = min; i <= max; i += step) {
input.push(i);
}
return input;
};
使用UnderscoreJS:
angular.module('myModule')
.run(['$rootScope', function($rootScope) { $rootScope.range = _.range; }]);
将此应用到$rootScope使其在任何地方都可用:
<div ng-repeat="x in range(1,10)">
{{x}}
</div>
我使用自定义ng-repeat-range指令:
/**
* Ng-Repeat implementation working with number ranges.
*
* @author Umed Khudoiberdiev
*/
angular.module('commonsMain').directive('ngRepeatRange', ['$compile', function ($compile) {
return {
replace: true,
scope: { from: '=', to: '=', step: '=' },
link: function (scope, element, attrs) {
// returns an array with the range of numbers
// you can use _.range instead if you use underscore
function range(from, to, step) {
var array = [];
while (from + step <= to)
array[array.length] = from += step;
return array;
}
// prepare range options
var from = scope.from || 0;
var step = scope.step || 1;
var to = scope.to || attrs.ngRepeatRange;
// get range of numbers, convert to the string and add ng-repeat
var rangeString = range(from, to + 1, step).join(',');
angular.element(element).attr('ng-repeat', 'n in [' + rangeString + ']');
angular.element(element).removeAttr('ng-repeat-range');
$compile(element)(scope);
}
};
}]);
HTML代码是
<div ng-repeat-range from="0" to="20" step="5">
Hello 4 times!
</div>
或者简单地
<div ng-repeat-range from="5" to="10">
Hello 5 times!
</div>
或者简单地说
<div ng-repeat-range to="3">
Hello 3 times!
</div>
或者只是
<div ng-repeat-range="7">
Hello 7 times!
</div>
你可以在angular中使用'after'或'before'过滤器。过滤模块(https://github.com/a8m/angular-filter)
$scope.list = [1,2,3,4,5,6,7,8,9,10]
HTML:
<li ng-repeat="i in list | after:4">
{{ i }}
</li>
结果: 5 6 7 8 9 10
@Mormegil的解决方案的改进
app.filter('makeRange', function() {
return function(inp) {
var range = [+inp[1] && +inp[0] || 0, +inp[1] || +inp[0]];
var min = Math.min(range[0], range[1]);
var max = Math.max(range[0], range[1]);
var result = [];
for (var i = min; i <= max; i++) result.push(i);
if (range[0] > range[1]) result.reverse();
return result;
};
});
使用
<span ng-repeat="n in [3, -3] | makeRange" ng-bind="n"></span>
Three, two, one, zero, one, two, three
<span ng-repeat="n in [-3, 3] | makeRange" ng-bind="n"></span>
Minus 3, minus 2, minus 1, 0, 1, 2, 3
<span ng-repeat="n in [3] | makeRange" ng-bind="n"></span>
0, 1, 2, 3
<span ng-repeat="n in [-3] | makeRange" ng-bind="n"></span>
0-1-2-3
