在AngularJS中呈现视图时会触发哪个事件?

时间:2014-01-30 16:48:24

标签: javascript angularjs angularjs-view

我知道有$viewContentLoaded,但是在 AngularJS用占位符代替范围变量之前触发

我设法通过在$viewContentLoaded侦听器中设置0 ms的超时来解决此问题,但这非常难看。

我正在使用它来解析partials中包含的LessCSS样式表,但是我有一个URL前缀字段,在将它传递给LESS之前,我需要将其替换为样式表URL。

这是我的代码(我丑陋的黑客):

var AccountController = function($scope, UserService) {
    var user = UserService.get();
    $scope.username = user.profile.displayName || user.contact;

    var bindLESSInit = function($scope, linkElementSelector) {
        $scope.$on('$viewContentLoaded', function() {
            var linkElement = document.querySelector(linkElementSelector);
            if (!linkElement) throw new Error('bindLESSInit: link element not found');

            console.log('link href before timeout: ', linkElement.href);
            // BAD: outputs "http://localhost:8282/%5B%5BstaticURLPrefix%5D%5D/static/portal/app/less/account.less"
            setTimeout(function() {
                console.log('link href after timeout: ', linkElement.href);
                // GOOD: outputs "http://localhost:8282/static/portal/app/less/account.less"
                // clear previous view's styles
                less.sheets = less.sheets.filter(function(e) { 
                    return e.getAttribute('class') && e.getAttribute('class').match('view-style');
                });
                less.sheets.push(linkElement);
                less.refresh();   
            }, 0);

        });
    };

    bindLESSInit($scope, '#account-stylesheet');    
};

[...]

这里有一个相关问题:How can I trigger an event when an angular JS route template has been loaded

我尝试使用$routeChangeSuccess代替答案,但结果相同。

干杯

2 个答案:

答案 0 :(得分:2)

这是一个非常长的线程,但它可能会对你有所帮助。从快速阅读,我认为这不是一个有角度的做事方式。相反,建议使用directive来解决问题。

https://github.com/angular/angular.js/issues/734

答案 1 :(得分:1)

根据Jess的回答,我采用了另一条路径并使用指令解决了它。

/**
 * Directive to load LESS stylesheets when inserted.
 * @param {attribute} url url of the stylesheet
 */
var lessStylesheetDirective = function() {
    var link = function(scope, element, attrs) {        
        var linkElement = $('<link rel="stylesheet/less" type="text/css">');

        // when link is called, we don't have the attribute yet, if it's interpolated.
        // see http://stackoverflow.com/questions/11913841
        attrs.$observe('url', function(value) {
            if (!value) return;

            if (!window.less) throw new error('LESS global not found!');  

            linkElement.href = value;
            less.sheets.push(linkElement);

            // we reload everything FIXME: can we reload only this one?
            less.refresh(); 
        });

        element.on('$destroy', function() {
            // we remove our style from less, so it won't be parsed again
            less.sheets = less.sheets.filter(function(e) { 
                return e !== linkElement;
            });
        });
    };

    return {
        link: link,
    }
};

app.directive('lessStylesheet', lessStylesheetDirective);

用法:

<div less-stylesheet url="{{yourUrlComesHere}}"></div>