Precise DOM morphing
morphing
typescript
dom
Rename `preserveModified` to `preserveChanges`
+42
-44
+10
-12
src/morphlex.ts
+10
-12
src/morphlex.ts
···
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* This prevents user-entered data from being overwritten.
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* @default false
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*/
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preserveModified?: boolean
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preserveChanges?: boolean
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/**
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* Called before a node is visited during morphing.
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* @param options Optional configuration for the morphing behavior.
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* @example
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* ```ts
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* morphDocument(document, "<html>...</html>", { preserveModified: true })
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* morphDocument(document, "<html>...</html>", { preserveChanges: true })
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* ```
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*/
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export function morphDocument(from: Document, to: Document | string, options?: Options): void {
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for (const { name, value } of to.attributes) {
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if (name === "value") {
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if (isInputElement(from) && from.value !== value) {
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if (!this.#options.preserveModified || from.value === from.defaultValue) {
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if (!this.#options.preserveChanges || from.value === from.defaultValue) {
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from.value = value
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}
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}
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if (name === "selected") {
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if (isOptionElement(from) && !from.selected) {
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if (!this.#options.preserveModified || from.selected === from.defaultSelected) {
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if (!this.#options.preserveChanges || from.selected === from.defaultSelected) {
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from.selected = true
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}
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}
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if (name === "checked") {
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if (isInputElement(from) && !from.checked) {
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if (!this.#options.preserveModified || from.checked === from.defaultChecked) {
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if (!this.#options.preserveChanges || from.checked === from.defaultChecked) {
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from.checked = true
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}
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}
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if (!to.hasAttribute(name)) {
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if (name === "selected") {
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if (isOptionElement(from) && from.selected) {
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if (!this.#options.preserveModified || from.selected === from.defaultSelected) {
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if (!this.#options.preserveChanges || from.selected === from.defaultSelected) {
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from.selected = false
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}
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}
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if (name === "checked") {
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if (isInputElement(from) && from.checked) {
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if (!this.#options.preserveModified || from.checked === from.defaultChecked) {
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if (!this.#options.preserveChanges || from.checked === from.defaultChecked) {
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from.checked = false
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}
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}
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from.textContent = newTextContent
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}
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if (this.#options.preserveModified && isModified) return
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if (this.#options.preserveChanges && isModified) return
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from.value = from.defaultValue
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}
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// Find LIS - these nodes don't need to move
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const lisIndices = this.#longestIncreasingSubsequence(sequence)
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const shouldNotMove = new Set<number>()
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for (const idx of lisIndices) {
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shouldNotMove.add(sequence[idx]!)
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for (const i of lisIndices) {
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shouldNotMove.add(sequence[i]!)
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}
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// Process nodes in forward order to maintain proper positioning
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let insertionPoint: ChildNode | null = parent.firstChild
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for (let i = 0; i < toChildNodes.length; i++) {
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const node = toChildNodes[i]!
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const match = matches[i]
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if (match) {
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const matchIndex = fromIndex.get(match)!
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// Only move if not in LIS
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if (!shouldNotMove.has(matchIndex)) {
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moveBefore(parent, match, insertionPoint)
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}
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-32
test/new/inputs.browser.test.ts
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test/new/inputs.browser.test.ts
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import { dom } from "./utils"
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describe("text input", () => {
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test("morphing a modified value with preserveModified enabled", () => {
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test("morphing a modified value with preserveChanges enabled", () => {
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const a = dom(`<input type="text" value="a">`) as HTMLInputElement
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const b = dom(`<input type="text" value="b">`) as HTMLInputElement
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a.value = "c"
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.outerHTML).toBe(`<input type="text" value="b">`)
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expect(a.value).toBe("c")
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})
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test("morphing a modified value preserveModified disabled", () => {
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test("morphing a modified value preserveChanges disabled", () => {
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const a = dom(`<input type="text" value="a">`) as HTMLInputElement
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const b = dom(`<input type="text" value="b">`) as HTMLInputElement
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a.value = "c"
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morph(a, b, { preserveModified: false })
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morph(a, b, { preserveChanges: false })
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expect(a.outerHTML).toBe(`<input type="text" value="b">`)
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expect(a.value).toBe("b")
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})
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test("morphing an unmodified value with preserveModified enabled", () => {
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test("morphing an unmodified value with preserveChanges enabled", () => {
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const a = dom(`<input type="text" value="a">`) as HTMLInputElement
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const b = dom(`<input type="text" value="b">`) as HTMLInputElement
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.outerHTML).toBe(`<input type="text" value="b">`)
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expect(a.value).toBe("b")
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})
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describe("checkbox", () => {
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test("morphing a modified checkbox checked with preserveModified enabled", () => {
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test("morphing a modified checkbox checked with preserveChanges enabled", () => {
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const a = dom(`<input type="checkbox">`) as HTMLInputElement
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const b = dom(`<input type="checkbox" checked>`) as HTMLInputElement
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a.checked = true
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.hasAttribute("checked")).toBe(true)
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expect(a.checked).toBe(true)
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})
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test("morphing a modified checkbox checked with preserveModified disabled", () => {
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test("morphing a modified checkbox checked with preserveChanges disabled", () => {
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const a = dom(`<input type="checkbox">`) as HTMLInputElement
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const b = dom(`<input type="checkbox" checked>`) as HTMLInputElement
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a.checked = true
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morph(a, b, { preserveModified: false })
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morph(a, b, { preserveChanges: false })
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expect(a.hasAttribute("checked")).toBe(true)
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expect(a.checked).toBe(true)
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})
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test("morphing an unmodified checkbox with preserveModified enabled", () => {
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test("morphing an unmodified checkbox with preserveChanges enabled", () => {
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const a = dom(`<input type="checkbox">`) as HTMLInputElement
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const b = dom(`<input type="checkbox" checked>`) as HTMLInputElement
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.hasAttribute("checked")).toBe(true)
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expect(a.checked).toBe(true)
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})
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test("morphing a modified checkbox unchecked with preserveModified enabled", () => {
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test("morphing a modified checkbox unchecked with preserveChanges enabled", () => {
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const a = dom(`<input type="checkbox" checked>`) as HTMLInputElement
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const b = dom(`<input type="checkbox">`) as HTMLInputElement
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a.checked = false
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.hasAttribute("checked")).toBe(false)
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expect(a.checked).toBe(false)
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})
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test("morphing a modified checkbox unchecked with preserveModified disabled", () => {
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test("morphing a modified checkbox unchecked with preserveChanges disabled", () => {
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const a = dom(`<input type="checkbox" checked>`) as HTMLInputElement
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const b = dom(`<input type="checkbox">`) as HTMLInputElement
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a.checked = false
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morph(a, b, { preserveModified: false })
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morph(a, b, { preserveChanges: false })
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expect(a.hasAttribute("checked")).toBe(false)
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expect(a.checked).toBe(false)
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})
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describe("select", () => {
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test("morphing a modified select option with preserveModified enabled", () => {
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test("morphing a modified select option with preserveChanges enabled", () => {
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const a = dom(`<select><option value="a">A</option><option value="b">B</option></select>`) as HTMLSelectElement
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const b = dom(`<select><option value="a">A</option><option value="b" selected>B</option></select>`) as HTMLSelectElement
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a.value = "b"
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.options[1].hasAttribute("selected")).toBe(true)
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expect(a.value).toBe("b")
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expect(a.options[1].selected).toBe(true)
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})
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test("morphing a modified select option with preserveModified disabled", () => {
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test("morphing a modified select option with preserveChanges disabled", () => {
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const a = dom(`<select><option value="a">A</option><option value="b">B</option></select>`) as HTMLSelectElement
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const b = dom(`<select><option value="a">A</option><option value="b" selected>B</option></select>`) as HTMLSelectElement
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a.value = "b"
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morph(a, b, { preserveModified: false })
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morph(a, b, { preserveChanges: false })
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expect(a.options[1].hasAttribute("selected")).toBe(true)
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expect(a.value).toBe("b")
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expect(a.options[1].selected).toBe(true)
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})
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test("morphing an unmodified select option with preserveModified enabled", () => {
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test("morphing an unmodified select option with preserveChanges enabled", () => {
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const a = dom(`<select><option value="a">A</option><option value="b">B</option></select>`) as HTMLSelectElement
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const b = dom(`<select><option value="a">A</option><option value="b" selected>B</option></select>`) as HTMLSelectElement
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.options[1].hasAttribute("selected")).toBe(true)
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expect(a.value).toBe("b")
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expect(a.options[1].selected).toBe(true)
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})
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test("morphing a modified select option back to default with preserveModified enabled", () => {
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test("morphing a modified select option back to default with preserveChanges enabled", () => {
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const a = dom(`<select><option value="a">A</option><option value="b" selected>B</option></select>`) as HTMLSelectElement
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const b = dom(`<select><option value="a">A</option><option value="b">B</option></select>`) as HTMLSelectElement
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a.value = "a"
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.options[1].hasAttribute("selected")).toBe(false)
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expect(a.value).toBe("a")
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expect(a.options[0].selected).toBe(true)
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})
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test("morphing a modified select option back to default with preserveModified disabled", () => {
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test("morphing a modified select option back to default with preserveChanges disabled", () => {
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const a = dom(`<select><option value="a">A</option><option value="b" selected>B</option></select>`) as HTMLSelectElement
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const b = dom(`<select><option value="a">A</option><option value="b">B</option></select>`) as HTMLSelectElement
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a.value = "a"
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morph(a, b, { preserveModified: false })
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morph(a, b, { preserveChanges: false })
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expect(a.options[1].hasAttribute("selected")).toBe(false)
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expect(a.value).toBe("a")
···
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})
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describe("textarea", () => {
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test("morphing a modified textarea value with preserveModified enabled", () => {
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test("morphing a modified textarea value with preserveChanges enabled", () => {
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const a = dom(`<textarea>a</textarea>`) as HTMLTextAreaElement
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const b = dom(`<textarea>b</textarea>`) as HTMLTextAreaElement
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a.value = "c"
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.textContent).toBe("b")
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expect(a.value).toBe("c")
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})
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test("morphing a modified textarea value with preserveModified disabled", () => {
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+
test("morphing a modified textarea value with preserveChanges disabled", () => {
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const a = dom(`<textarea>a</textarea>`) as HTMLTextAreaElement
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const b = dom(`<textarea>b</textarea>`) as HTMLTextAreaElement
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a.value = "c"
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morph(a, b, { preserveModified: false })
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+
morph(a, b, { preserveChanges: false })
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expect(a.textContent).toBe("b")
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expect(a.value).toBe("b")
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})
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test("morphing an unmodified textarea value with preserveModified enabled", () => {
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test("morphing an unmodified textarea value with preserveChanges enabled", () => {
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const a = dom(`<textarea>a</textarea>`) as HTMLTextAreaElement
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const b = dom(`<textarea>b</textarea>`) as HTMLTextAreaElement
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morph(a, b, { preserveModified: true })
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morph(a, b, { preserveChanges: true })
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expect(a.textContent).toBe("b")
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expect(a.value).toBe("b")