This content originally appeared on DEV Community and was authored by DEV Community
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I spent this weekend playing around with Scala.js and learning how to manipulate browser cookies with it.
Check out the live demo at cookies.awwsmm.com.
The source is available at github.com/awwsmm/CookiesScalaJS.
There are a few cool Scala flairs here, particularly this bit which pattern matches on a regular expression
def clearAllCookies(): Unit = {
val Cookie = "([^=]+)=.+".r
document.cookie.split("; ").foreach {
case Cookie(key) => clearCookie(key)
case other => err.println(s"Couldn't parse '$other' as a key=value cookie pair")
}
}
In order to ensure that users don't include the ; or = characters in their cookie keys and values (which confuses the parser), I've also added these two little safeguards, as well
// prevent the user from typing ';' or '=' into the input
input.addEventListener("keypress", (e: dom.KeyboardEvent) => {
if (e.key == ";" || e.key == "=") {
e.preventDefault()
}
})
// prevent the user from pasting ';' or '=' into the input
input.addEventListener("paste", (e: dom.ClipboardEvent) => {
val text = e.clipboardData.getData("text")
if (text.contains(";") || text.contains("=")) {
e.preventDefault()
}
})
What do you think? Anyone else on DEV doing anything cool with Scala.js?
This content originally appeared on DEV Community and was authored by DEV Community
DEV Community | Sciencx (2021-11-21T20:06:28+00:00) Playing around with browser cookies in Scala.js. Retrieved from https://www.scien.cx/2021/11/21/playing-around-with-browser-cookies-in-scala-js/
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