Kotlin Multiplatform/JS 未解决参考 Document.evaluate()答案

【问题标题】：Kotlin Multiplatform/JS Unresolved reference Document.evaluate()Kotlin Multiplatform/JS 未解决参考 Document.evaluate()
【发布时间】：2023-02-01 01:19:47
【问题描述】：

语境：Kotlin 多平台 JavaScript.

我正在尝试使用 Document.evaluate() 但得到的是 Unresolved reference: evaluate 和 Unresolved reference: XPathResult。

import org.w3c.dom.Document
import org.w3c.dom.parsing.DOMParser

object JavascriptTest {
    // language=HTML
    private val html = """
            <body>
               <div>
                  <a class="button" href="http://exaple.com">Example</a>
               </div>
            </body>
        """.trimIndent()

    fun parseXpath() {
        val parser = DOMParser()
        val document: Document = parser.parseFromString(html, "text/html")
        val xpath = "//div/a[contains(@class, \"button\")]"
        document.evaluate(xpath, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null)
    }
}

构建.gradle.kts

kotlin {
    js(IR) {
        useCommonJs()
        browser {}
        binaries.executable()
    }

   sourceSets {
      val jsTest by getting
   }

【问题讨论】：

标签： kotlin kotlin-multiplatform kotlin-js

【解决方案1】：

据我所知，XPathEvaluator 接口目前没有开箱即用的绑定。但是你可以使用asDynamic自己添加它们：

val XPathResult = window.asDynamic().XPathResult

fun Document.evaluate(
    xpathExpression: String,
    contextNode: Node,
    namespaceResolver: Any?,
    resultType: Any,
    result: Any?
): dynamic =
    asDynamic().evaluate(xpathExpression, contextNode, namespaceResolver, resultType, result)

【讨论】：

【解决方案2】：

作为@Evgeny 解决方案的替代方案，您还可以使用Use JavaScript code from Kotlin 中建议的标记为external 的此类

external class XPathResult {

    companion object {
        val ANY_TYPE: Int
        val NUMBER_TYPE: Int
        val ANY_UNORDERED_NODE_TYPE: Int
        val BOOLEAN_TYPE: Int
        val FIRST_ORDERED_NODE_TYPE: Int
        val ORDERED_NODE_ITERATOR_TYPE: Int
        val ORDERED_NODE_SNAPSHOT_TYPE: Int
        val STRING_TYPE: Int
        val UNORDERED_NODE_ITERATOR_TYPE: Int
        val UNORDERED_NODE_SNAPSHOT_TYPE: Int
    }

    // Instance properties:

    val booleanValue: Boolean?
    val invalidIteratorState: Boolean
    val numberValue: Double?
    val resultType: Int
    val singleNodeValue: dynamic
    val snapshotLength: Int
    val stringValue: String?

    // Instance methods:
    fun iterateNext(): Node?

    fun snapshotItem(index: Int): Node?
}


fun Document.evaluate(
    xpathExpression: String,
    contextNode: Node,
    namespaceResolver: Any?,
    resultType: Any,
    result: Any?,
): XPathResult =
    asDynamic().evaluate(
        xpathExpression,
        contextNode,
        namespaceResolver,
        resultType,
        result
    ) as XPathResult

【讨论】：