Ilya Gorbunov
52 lines
1.6 KiB
Kotlin
52 lines
1.6 KiB
Kotlin
/*
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* Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package kotlinx.dom
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import org.w3c.dom.*
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/** Returns true if the element has the given CSS class style in its 'class' attribute */
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@SinceKotlin("1.4")
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public fun Element.hasClass(cssClass: String): Boolean = className.matches("""(^|.*\s+)$cssClass($|\s+.*)""".toRegex())
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/**
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* Adds CSS class to element. Has no effect if all specified classes are already in class attribute of the element
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*
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* @return true if at least one class has been added
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*/
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@SinceKotlin("1.4")
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public fun Element.addClass(vararg cssClasses: String): Boolean {
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val missingClasses = cssClasses.filterNot { hasClass(it) }
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if (missingClasses.isNotEmpty()) {
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val presentClasses = className.trim()
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className = buildString {
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append(presentClasses)
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if (!presentClasses.isEmpty()) {
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append(" ")
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}
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missingClasses.joinTo(this, " ")
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}
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return true
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}
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return false
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}
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/**
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* Removes all [cssClasses] from element. Has no effect if all specified classes are missing in class attribute of the element
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*
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* @return true if at least one class has been removed
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*/
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@SinceKotlin("1.4")
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public fun Element.removeClass(vararg cssClasses: String): Boolean {
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if (cssClasses.any { hasClass(it) }) {
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val toBeRemoved = cssClasses.toSet()
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className = className.trim().split("\\s+".toRegex()).filter { it !in toBeRemoved }.joinToString(" ")
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return true
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}
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return false
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}
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