javascript 如何将函数应用于控制器内的 angularjs 表达式？
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How to apply a function to an angularjs expression inside a controller?
提问by axel
simple question, I would like to apply a function inside my controller scope to an expression.
一个简单的问题，我想将控制器范围内的函数应用于表达式。
This is my HTML inside my controller
这是我的控制器中的 HTML
<p><span ng-if="paginaDetail.pubdate !== '' ">Vanaf {{paginaDetail.pubdate}}</span></p>
This is my javascript
这是我的javascript
$scope.formatMysqlTimestampToHumanreadableDateTime = function(sDateTime){
sDateTime = sDateTime.toString();
var sHumanreadableDateTime = sDateTime.substring(8, 10) + "/" + sDateTime.substring(5, 7) + "/" + sDateTime.substring(0, 4);
sHumanreadableDateTime += " " + sDateTime.substring(11, 13) + ":" + sDateTime.substring(14, 16);
return sHumanreadableDateTime;
};
and what I was trying to do is to apply formatMysqlTimestampToHumanreadableDateTimeto paginaDetail.pubdatelike this
我想做的是将formatMysqlTimestampToHumanreadableDateTime应用到paginaDetail.pubdate像这样
<p><span ng-if="paginaDetail.pubdate !== '' ">Vanaf {{formatMysqlTimestampToHumanreadableDateTime(paginaDetail.pubdate)}}</span></p>
or this
或这个
<p><span ng-if="paginaDetail.pubdate !== '' ">Vanaf {{paginaDetail.pubdate|formatMysqlTimestampToHumanreadableDateTime}}</span></p>
but both ways are not correct.
但两种方式都不正确。
The first method works but on the console i've this error
第一种方法有效，但在控制台上我有这个错误
Error: [$interpolate:interr] http://errors.angularjs.org/1.2.16/$interpolate/interr?p0=Tot%20%7B%7BformatMysqlTimestampToHumanreadableDateTime(paginaDetail.endpubdate)%7D%7D&p1=TypeError%3A%20sDateTime%20is%20undefined t/<@http://mysite.local/js/libs/angular.min.js:6:443g/r@http://mysite.local/js/libs/angular.min.js:78:354Yd/this.$gethttp://mysite.local/js/libs/angular.min.js:106:161 Yd/this.$gethttp://mysite.local/js/libs/angular.min.js:109:285 f@http://mysite.local/js/libs/angular.min.js:71:234F@http://mysite.local/js/libs/angular.min.js:75:408ve/http://mysite.local/js/libs/angular.min.js:76:457
错误：[$interpolate:interr] http://errors.angularjs.org/1.2.16/$interpolate/interr?p0=Tot%20%7B%7BformatMysqlTimestampToHumanreadableDateTime(paginaDetail.endpubdate)%7D%7D&p1=TypeError%3A% 20sDateTime%20is%20undefined t/<@ http://mysite.local/js/libs/angular.min.js:6:443g/r@ http://mysite.local/js/libs/angular.min。 js:78:354Yd/this.$gethttp://mysite.local/js/libs/angular.min.js:106:161 Yd/this.$gethttp://mysite.local/js/libs/angular。 min.js:109:285 f@ http://mysite.local/js/libs/angular.min.js:71:234F@ http://mysite.local/js/libs/angular.min.js: 75:408ve/http://mysite.local/js/libs/angular.min.js:76:457
and the second one simply doesn't work.
而第二个根本不起作用。
Do you have any suggestions? Thanks a lot.
你有什么建议吗？非常感谢。
采纳答案by Jorg
If I can offer an alternative option to controller based actions... this looks like a great scenario for a filter
如果我可以为基于控制器的操作提供替代选项......这看起来是过滤器的一个很好的场景
The idea is to use filter the input while it's being put into the html like {{myDate|format}}.
这个想法是在将输入放入 html 时使用过滤器{{myDate|format}}。
The filter is defined like:
过滤器定义如下：
myApp.filter('format', function () {
return function (input) {
//your date parser here
};
});
Or whatever else you wish to do with it. This way you can reuse it without having to put the function in every controller you wish to use it in.
或者你想用它做什么。这样您就可以重复使用它，而不必将该功能放在您希望使用它的每个控制器中。
Here's a fiddleyou can expand on, to get you going.
这是一个你可以扩展的小提琴，让你继续前进。
editLooking more closely at the error I think your actual problem is that .pubdateis not populated (TypeError: sDateTime is not defined). Try to put a breakpoint in the function or see what console says.
编辑更仔细地查看错误，我认为您的实际问题.pubdate是未填充 ( TypeError: sDateTime is not defined)。尝试在函数中放置一个断点或查看控制台显示的内容。
回答by gorpacrate
Actually your example {{func(param)}}works fine: http://jsfiddle.net/HB7LU/4418/. Problem is in something else. Try to make a fiddle illustrating your problem.
其实你的例子{{func(param)}}工作正常：http: //jsfiddle.net/HB7LU/4418/。问题出在别的地方。尝试制作一个说明您的问题的小提琴。
回答by Mohammad Kermani
This question already has the correct answer, but this may help to understand it better.For the question "How to run/apply a function inside an Angular expression", I can introduce this way,
这个问题已经有了正确的答案，但这可能有助于更好地理解它。对于“ How to run/apply a function inside an Angular expression”这个问题，我可以这样介绍，
Assign your function to $scope.something and run that. Example:
将您的函数分配给 $scope.something 并运行它。例子：
JavaScript inside your controller:
控制器中的 JavaScript：
$scope.printMe= function(text){
return text;
}
HTML (expression):
HTML（表达式）：
<p>{{printMe("Hello!")}}</p>
You will get Hello!inside your <p>tag
你会Hello!进入你的<p>标签
