AngularJS directive encounters issues when trying to display modified HTML elements

I have been working on creating a straightforward directive that swaps out one span with another, binding to two attributes in the scope:

.directive('exCategory', function () {
    return {
        restrict: 'A',
        scope: {
            category: '=exCategory'
        },
        replace: true,
        template: '<span class="category-label" ng-bind="category.name" style="background-color: {{category.color}};"></span>',
        link: function (scope, element) {
            console.log(scope, element);

        }
    };
})

Here is my HTML snippet:

<span ex-category="transaction.category"></span>

However, when it renders, the color is not displayed and I am seeing this error in the console:

TypeError: Cannot read property 'length' of undefined
    at $interpolate (https://ajax.googleapis.com/ajax/libs/angularjs/1.1.4/angular.js:5318:24)
    // More error lines below...

It seems like there is an issue with the generated DOM:

<span class="category-label" style="background-color: {{category.color}};;background-color: {{category.color}};" ex-category="transaction.category">

If I remove the color part, it works fine.

Any advice or suggestions on how to fix this problem would be appreciated.

Edit: If I directly render the value I want to display in my template, it works without any issues.

Edit: The problem seems to stem from the style tag:

template: '<span class="category-label" ng-bind="category.name" style="aaa">{{category.color}}</span>'

renders as:

<span class="category-label ng-binding" ng-bind="category.name" style="aaa;aaa" ex-category="transaction.category">asdads</span>

This problem doesn't occur with version 1.0.1. You can check out the JSFiddle showcasing the issue in version 1.1.5 here:

http://jsfiddle.net/marcio0/a5KLT/

Answer №1

Instead of using

style="background-color: {{category.color}};"
, consider utilizing ng-style in the following manner:

ng-style="{backgroundColor: category.color}"

For a more consistent markup, check out this updated fiddle.

Answer №2

It appears that there is a issue within the Angular 1.1x-branch, which can be seen here. One potential solution is to eliminate the style in your template and set up a watch manually in your link function:

template: '<span class="category-label" ng-bind="category.name"></span>',
link: function (scope, element) {
    scope.$watch('category.color', function() {
        element.attr('style', 'background-color: ' + scope.category.color + ';');
   });

Note:

It would be more effective to use ng-style instead.

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