Conditionally adding data-attribute in Angular directive template

92,624

Solution 1

I think a good way could be to use ng-attr- followed by the expression you want to evaluate. In your case it would be something like:

<span ng-attr-data-toggle="{{ isValueTrue ? 'toggle' : 'notToggle' }}"></span>

Here's a fiddle with an example.

Solution 2

will produce when isTrue=true : 

and when isTrue=false : 

Solution 3

At the moment, there is no angular directive that allows you to remove or add an attribute conditionally. You can do ng-switch around the span, one with that attr and another one without it.

<div ng-switch on="condition">
<span data-toggle="dropdown" ng-switch-when="value"></span>
<span ng-switch-default></span>
</div>

<span data-toggle="dropdown" ng-if="expression"></span>
<span ng-if="!expression"></span>

You can also create a directive for that same purpose (adding/removing attrs conditionally) but that would be a bit more complicated.

Additionally if what you want is manage the scope variable inside the directive you can pass it as another attribute.

Example:

<span data-toggle="dropdown" when="isDropDown"></span>

92,624

Author by

Dimon Buzz

Updated on July 08, 2022

Comments

Dimon Buzz almost 2 years
I'm working on the template for a directive. If a property in the scope is set to true, data-toggle="dropdown" should be appended to the element. If the variable is false, this data attribute should not render as an attribute of the element.

For example, if scope variable is true, the template should render:
```

```
If false, the template should render:
```

```
What would the template look like to accomplish this?

For example, I know that I can use ng-class to conditionally include a class. If I want the template to render this:
```

```
Then my template would look like this:
```
"
```
If scope variable isDropDown is false, then the template will simply render:
```

```
So there's a way in a template to conditionally add a class="dropdown". Is there a syntax for templates that allows me to conditionally add data-toggle="dropdown"?

One of the things I've tried for the template is:
```
"
```
My thinking with the above template is that if the scope variable isDropDown is true, the value of data-toggle will be set to "dropdown". If isDropDown is false, then the value of data-toggle would simply be an empty string "". That doesn't seem to work though.
Aurelio over 9 years

@LittleBigBot I might be missing your point here. Can you provide any sample code to confirm that and better explain what you mean for "general attributes"/not working "for directives"?
Aurelio over 9 years

I tested on some directives and even with isolate scope, replace and template it still works for me, see: jsfiddle.net/gleezer/hrdoyz04/1
Belladonna over 9 years

Yeah, you need two attributes to do it correctly for directives. But this fiddle is what I mean, you can set the to be true, false, but it will always render the directive: jsfiddle.net/littlebigbot/9ym6nnck
Belladonna over 9 years

There are two attributes on this div: <div my-var="{{myVar}}" my-directive>
cha almost 9 years

Thanks a lot... This works for me. I have got chance to solve my problem. It was <li ng-repeat="node in data" ui-tree-node ng-include="'nodes_renderer.html'" ng-attr-data-nodrag="{{node.shared_status == 0 && true || undefined }}"></li>
Petr Urban almost 9 years

ng-attr-myattribute="{{myCondition ? '' : undefined}}" In case you want to conditionally remove and add attribute (with empty attribute value), use this. Attribute is added if condition is true, attribute is removed if condition is false.
Andreas Linnert about 8 years

Has this behavior been changed in a particular version? It works for me. undefined removes the attribute. I'm using 1.5.5.
Splaktar almost 8 years

The docs for this are here: docs.angularjs.org/guide/interpolation