AngularJs - 错误:已达到 10 次 $digest() 迭代.中止 [英] AngularJs - Error: 10 $digest() iterations reached. Aborting
问题描述
我正在尝试使用 Angular 创建一个 Metro Tile 类型的网格,为了实现这一点,我希望每个磁贴都是不同的颜色.所以我的行动计划是创建一个函数,在循环中随机选择一种颜色(使用 ng-repeat
).这是我到目前为止所拥有的......
<div ><h6>{{stockRecord.ProductGroupName}}</h6>
如您所见,我正在使用名为 RandomColourClass 的函数设置类名,这是 JS 位
$scope.TileColours = [{colour:'thumbnail tile tile-blue'},{colour:'thumbnail tile tile-green'},{colour:'缩略图平铺红色'}];$scope.RandomColourClass = function(){var randomColour = $scope.TileColours[Math.floor(Math.random() * $scope.TileColours.length)];返回 randomColour.colour.toString();};
这一切正常,瓷砖颜色不同,但我不断收到以下错误
<块引用>错误:已达到 10 次 $digest() 迭代.正在中止!".
我已经查看了有关该问题的其他帖子,但我不知道我需要更改什么才能使其正常工作!?任何帮助或指导将不胜感激:)
Angular 执行一个 digest 函数来在您的数据发生变化时更新 DOM.
在摘要期间,它重新计算您在 DOM 中绑定的所有值,在本例中为 {{RandomColorClass()}}
.如果其中任何一个发生变化,它会再次执行摘要循环(例如,因为某些变量可能取决于已更改变量的值).
它重复执行此操作,直到连续的两个摘要产生相同的值——即,没有任何变化.
发生的事情是,当摘要发生时,您的 RandomColorClass()
函数被调用并返回一个不同的值.这会触发一个额外的摘要,其中 RandomColorClass()
再次返回一个不同的值,这会触发另一个摘要...
你能看出这是怎么回事吗?您不应该以这种方式生成随机值 - 而是在您的范围内生成它们并保留它们.
在您的范围内,一种方法可能是:
function randomColourClass() {/* ... */};$scope.GridStockRecords.forEach(function(record) {record.colorClass = randomColourClass();});
和 HTML:
<div><h6>{{stockRecord.ProductGroupName}}</h6>
I am trying to create a Metro Tile type grid with Angular, to achieve this i want each of the tiles to be a different colour. So my plan of action was to create a function that would randomly pick a colour inside a loop (using ng-repeat
). Here is what i have so far....
<div class={{RandomColourClass()}} ng-repeat="stockRecord in GridStockRecords | filter:searchText">
<div >
<h6>{{stockRecord.ProductGroupName}}</h6>
</div>
</div>
So as you can see i am setting the class name with a function called RandomColourClass, Here is the JS bits
$scope.TileColours = [{colour:'thumbnail tile tile-blue'},{colour:'thumbnail tile tile-green'},{colour:'thumbnail tile tile-red'}];
$scope.RandomColourClass = function(){
var randomColour = $scope.TileColours[Math.floor(Math.random() * $scope.TileColours.length)];
return randomColour.colour.toString();
};
This all works fine and the tiles are of different colours but i keep getting the following error
Error: 10 $digest() iterations reached. Aborting!".
I've had a look at other posts around the issue but i can't figure out what i need to change to get it working!? Any help or direction would be greatly appreciated :)
Angular performs a digest function to update the DOM when your data changes.
During the digest, it recomputes all the values you have bound in the DOM, in this case {{RandomColorClass()}}
. If any of them change, it again performs a digest cycle (since some variables may depend on the value of of the changed variable, for example).
It does this repeatedly until two digests in a row result in the same values -- i.e, nothing has changed.
What's happening is that when a digest occurs, your RandomColorClass()
function is being called and returns a different value. This triggers an additional digest, where RandomColorClass()
again returns a different value, which triggers another digest...
Can you see where this is going? You shouldn't be generating random values in this manner -- instead, generate them in your scope and persist them.
One approach might be, in your scope:
function randomColourClass() { /* ... */ };
$scope.GridStockRecords.forEach(function(record) {
record.colorClass = randomColourClass();
});
and HTML:
<div ng-repeat="stockRecord in GridStockRecords | filter:searchText"
ng-class="stockRecord.colorClass">
<div>
<h6>{{stockRecord.ProductGroupName}}</h6>
</div>
</div>
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