October 2017
Intermediate to advanced
370 pages
8h 57m
English
Content preview from AMP: Building Accelerated Mobile Pages
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Branching if...else expression
We can implement a basic if...else expression like this:
(currentImage==0 ? 'show' : 'hide')
You will probably recognize this expression syntax--it's shorthand for if...else in a number of programming languages. It says "if currentImage equals 0 then evaluate to string show, otherwise evaluate to hide". This is a useful pattern for showing or hiding elements based on a state property.
For performance reasons, there are limitations to what is possible with amp-bind expressions; these include the following:
- No access to JavaScript globals such as window or document
- No custom functions or classes
- No for loops
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