javascript - Is it safe to use ampersands (&) in AngularJS html templates - Stack Overflow

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I have been told that using ampersands in angular templates is bad practice since '&' is reserved in HTML, but I see it in examples for angular all the time.

To be clear, would it be safe to write

<div ng-show="bool1 && bool2"></div>

in an angular template?

I'm not interested in knowing if it works (it does), but if there are any edge cases where this could cause problems or if it's in fact discouraged.

I have been told that using ampersands in angular templates is bad practice since '&' is reserved in HTML, but I see it in examples for angular all the time.

To be clear, would it be safe to write

<div ng-show="bool1 && bool2"></div>

in an angular template?

I'm not interested in knowing if it works (it does), but if there are any edge cases where this could cause problems or if it's in fact discouraged.

• javascript
• html
• angularjs
• xhtml

Share Follow edited Apr 11, 2019 at 14:54 Jacob Sievers asked Sep 3, 2015 at 13:21 Jacob SieversJacob Sievers 53444 silver badges1414 bronze badges 3

• possible duplicate of Are plex expressions possible in ng-hide / ng-show? – bransonl Commented Sep 3, 2015 at 13:23
• I'm more interested in how this works with HTML not allowing use of '&' except for HTML character entities. – Jacob Sievers Commented Sep 3, 2015 at 13:34
• 1 Thymeleaf gives a SAXParseException while using them. So you shouldn't use them if you're also using Thymeleaf. – cst1992 Commented Oct 27, 2016 at 6:17

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3 Answers 3

Sorted by: Reset to default 5

It's fine. The HTML5 spec explicitly allows unencoded ampersands if they don't look like a character reference (such as ©). Sure, for some things like URLs it's better to be consistent and escape them. But for && with spaces around it, there's no chance that the browser will misinterpret the data, and && is significantly less readable.

Relevant Sections of the spec:

• https://www.w3/TR/html5/syntax.html#escapable-raw-text-elements
• https://www.w3/TR/html5/syntax.html#syntax-ambiguous-ampersand

I use ampersands in my Angular html templates too and never had a problem with them, but the best way to see if it's safe for you to use them is to just test their effect in a test app that resembles yours I guess...

Yes that is just fine, I use it all the time. Here's a fiddle showcasing:

 <div data-ng-show="bool1 && bool2">bool1 && bool2</div>
 <div data-ng-show="bool1 && !bool2">bool1 && !bool2</div>
 <div data-ng-show="!bool1 && bool2">!bool1 && bool2</div>
 <div data-ng-show="!bool1 && !bool2">!bool1 && !bool2</div>

http://jsfiddle/8drnp4ue/

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