__tests__/vnode.js
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const mod = require("../h3.js");
const h3 = mod.h3;
const h = mod.h;
describe("VNode", () => {
it("should provide a from method to initialize itself from an object", () => {
const fn = () => true;
const obj = {
id: "test",
type: "input",
value: "AAA",
$html: "",
data: { a: "1", b: "2" },
eventListeners: { click: fn },
children: [],
props: { title: "test" },
classList: ["a1", "a2"],
style: "padding: 2px",
};
const vnode1 = h("br");
vnode1.from(obj);
const vnode2 = h("input#test.a1.a2", {
value: "AAA",
$html: "",
data: { a: "1", b: "2" },
onclick: fn,
title: "test",
style: "padding: 2px",
});
expect(vnode1).toEqual(vnode2);
});
it("should provide a render method able to render textual nodes", () => {
const createTextNode = jest.spyOn(document, "createTextNode");
const vnode = h({ type: "#text", value: "test" });
const node = vnode.render();
expect(createTextNode).toHaveBeenCalledWith("test");
expect(node.constructor).toEqual(Text);
});
it("should provide a render method able to render simple element nodes", () => {
const createElement = jest.spyOn(document, "createElement");
const vnode = h("br");
const node = vnode.render();
expect(createElement).toHaveBeenCalledWith("br");
expect(node.constructor).toEqual(HTMLBRElement);
});
it("should provide a render method able to render element nodes with props and classes", () => {
const createElement = jest.spyOn(document, "createElement");
const vnode = h("span.test1.test2", { title: "test", falsy: false });
const node = vnode.render();
expect(createElement).toHaveBeenCalledWith("span");
expect(node.constructor).toEqual(HTMLSpanElement);
expect(node.getAttribute("title")).toEqual("test");
expect(node.classList.value).toEqual("test1 test2");
});
it("should provide a render method able to render element nodes with children", () => {
const vnode = h("ul", [h("li", "test1"), h("li", "test2")]);
const createElement = jest.spyOn(document, "createElement");
const node = vnode.render();
expect(createElement).toHaveBeenCalledWith("ul");
expect(createElement).toHaveBeenCalledWith("li");
expect(node.constructor).toEqual(HTMLUListElement);
expect(node.childNodes.length).toEqual(2);
expect(node.childNodes[1].constructor).toEqual(HTMLLIElement);
expect(node.childNodes[0].childNodes[0].data).toEqual("test1");
});
it("should handle boolean props when redrawing", () => {
const vnode1 = h("input", { type: "checkbox", checked: true });
const node = vnode1.render();
expect(node.checked).toEqual(true);
const vnode = h("input", { type: "checkbox", checked: false });
vnode1.redraw({ node, vnode });
expect(node.checked).toEqual(false);
});
it("should handle non-string props as properties and not create attributes", () => {
const v = h("div", {
test: true,
obj: { a: 1, b: 2 },
arr: [1, 2, 3],
num: 2.3,
str: "test",
s: "",
title: "testing!",
value: false,
});
const v2 = h("div", {
test: true,
obj: { a: 1, b: 2 },
arr: [1, 2, 3],
s: "",
title: "testing!",
value: "true",
});
const n = v.render();
expect(n.test).toEqual(true);
expect(n.obj).toEqual({ a: 1, b: 2 });
expect(n.arr).toEqual([1, 2, 3]);
expect(n.num).toEqual(2.3);
expect(n.str).toEqual("test");
expect(n.getAttribute("str")).toEqual("test");
expect(n.s).toEqual("");
expect(n.getAttribute("s")).toEqual("");
expect(n.title).toEqual("testing!");
expect(n.getAttribute("title")).toEqual("testing!");
expect(n.value).toEqual(undefined);
expect(n.getAttribute("value")).toEqual(null);
v.redraw({ node: n, vnode: v2 });
expect(n.getAttribute("value")).toEqual("true");
v2.value = null;
v.redraw({ node: n, vnode: v2 });
expect(n.getAttribute("value")).toEqual("");
});
it("should provide a render method able to render element nodes with a value", () => {
let vnode = h("input", { value: "test" });
const createElement = jest.spyOn(document, "createElement");
let node = vnode.render();
expect(createElement).toHaveBeenCalledWith("input");
expect(node.constructor).toEqual(HTMLInputElement);
expect(node.value).toEqual("test");
vnode = h("input", { value: null });
node = vnode.render();
expect(node.value).toEqual("");
vnode = h("test", { value: 123 });
node = vnode.render();
expect(node.getAttribute("value")).toEqual("123");
expect(node.value).toEqual(undefined);
});
it("should provide a render method able to render element nodes with event handlers", () => {
const handler = () => {
console.log("test");
};
const vnode = h("button", { onclick: handler });
const button = document.createElement("button");
const createElement = jest
.spyOn(document, "createElement")
.mockImplementationOnce(() => {
return button;
});
const addEventListener = jest.spyOn(button, "addEventListener");
const node = vnode.render();
expect(createElement).toHaveBeenCalledWith("button");
expect(node.constructor).toEqual(HTMLButtonElement);
expect(addEventListener).toHaveBeenCalledWith("click", handler);
});
it("it should provide a render method able to render elements with special props", () => {
const vnode = h("div", {
id: "test",
style: "margin: auto;",
data: { test: "aaa" },
$html: "<p>Hello!</p>",
});
const createElement = jest.spyOn(document, "createElement");
const node = vnode.render();
expect(createElement).toHaveBeenCalledWith("div");
expect(node.constructor).toEqual(HTMLDivElement);
expect(node.style.cssText).toEqual("margin: auto;");
expect(node.id).toEqual("test");
expect(node.dataset["test"]).toEqual("aaa");
expect(node.childNodes[0].textContent).toEqual("Hello!");
});
it("should provide a redraw method that is able to add new DOM nodes", () => {
const oldvnode = h("div#test", h("span"));
const newvnodeNoChildren = h("div");
const newvnode = h("div", [h("span#a"), h("span")]);
const node = oldvnode.render();
const span = node.childNodes[0];
oldvnode.redraw({ node: node, vnode: newvnodeNoChildren });
expect(oldvnode.children.length).toEqual(0);
oldvnode.redraw({ node: node, vnode: newvnode });
expect(oldvnode).toEqual(newvnode);
expect(oldvnode.children.length).toEqual(2);
expect(node.childNodes.length).toEqual(2);
expect(node.childNodes[0].id).toEqual("a");
expect(span).toEqual(node.childNodes[1]);
});
it("should provide a redraw method that is able to remove existing DOM nodes", () => {
let oldvnode = h("div", [h("span#a"), h("span")]);
let newvnode = h("div", [h("span")]);
let node = oldvnode.render();
oldvnode.redraw({ node: node, vnode: newvnode });
expect(oldvnode).toEqual(newvnode);
expect(oldvnode.children.length).toEqual(1);
expect(node.childNodes.length).toEqual(1);
oldvnode = h("div.test-children", [h("span.a"), h("span.b")]);
node = oldvnode.render();
newvnode = h("div.test-children", [h("div.c")]);
oldvnode.redraw({ node: node, vnode: newvnode });
expect(oldvnode).toEqual(newvnode);
expect(oldvnode.children.length).toEqual(1);
expect(node.childNodes.length).toEqual(1);
expect(oldvnode.children[0].classList[0]).toEqual("c");
});
it("should provide a redraw method that is able to figure out differences in children", () => {
const oldvnode = h("div", [h("span", "a"), h("span"), h("span", "b")]);
const newvnode = h("div", [
h("span", "a"),
h("span", "c"),
h("span", "b"),
]);
const node = oldvnode.render();
oldvnode.redraw({ node: node, vnode: newvnode });
expect(node.childNodes[1].textContent).toEqual("c");
});
it("should provide a redraw method that is able to figure out differences in existing children", () => {
const oldvnode = h("div", [
h("span.test", "a"),
h("span.test", "b"),
h("span.test", "c"),
]);
const newvnode = h("div", [
h("span.test", "a"),
h("span.test1", "b"),
h("span.test", "c"),
]);
const node = oldvnode.render();
oldvnode.redraw({ node: node, vnode: newvnode });
expect(node.childNodes[0].classList[0]).toEqual("test");
expect(node.childNodes[1].classList[0]).toEqual("test1");
expect(node.childNodes[2].classList[0]).toEqual("test");
});
it("should provide a redraw method that is able to update different props", () => {
const oldvnode = h("span", { title: "a", something: "b" });
const newvnode = h("span", { title: "b", id: "bbb" });
const node = oldvnode.render();
oldvnode.redraw({ node: node, vnode: newvnode });
expect(oldvnode).toEqual(newvnode);
expect(node.getAttribute("title")).toEqual("b");
expect(node.getAttribute("id")).toEqual("bbb");
expect(node.hasAttribute("something")).toEqual(false);
});
it("should provide a redraw method that is able to update different classes", () => {
const oldvnode = h("span.a.b", { title: "b" });
const newvnode = h("span.a.c", { title: "b" });
const node = oldvnode.render();
oldvnode.redraw({ node: node, vnode: newvnode });
expect(oldvnode).toEqual(newvnode);
expect(node.classList.value).toEqual("a c");
});
it("should provide redraw method to detect changed nodes if they have different elements", () => {
const oldvnode = h("span.c", { title: "b" });
const newvnode = h("div.c", { title: "b" });
const container = document.createElement("div");
const node = oldvnode.render();
container.appendChild(node);
oldvnode.redraw({ node: node, vnode: newvnode });
expect(node).not.toEqual(container.childNodes[0]);
expect(node.constructor).toEqual(HTMLSpanElement);
expect(container.childNodes[0].constructor).toEqual(HTMLDivElement);
});
it("should provide redraw method to detect position changes in child nodes", () => {
const v1 = h("ul", [h("li.a"), h("li.b"), h("li.c"), h("li.d")]);
const v2 = h("ul", [h("li.c"), h("li.b"), h("li.a"), h("li.d")]);
const n = v1.render();
expect(n.childNodes[0].classList[0]).toEqual("a");
v1.redraw({ node: n, vnode: v2 });
expect(n.childNodes[0].classList[0]).toEqual("c");
});
it("should optimize insertion and deletions when redrawing if all old/new children exist", () => {
const v = h("div", h("a"), h("d"));
const vnode = h("div", h("a"), h("b"), h("c"), h("d"));
const node = v.render();
v.redraw({ node, vnode });
expect(v.children.length).toEqual(4);
});
it("should provide redraw method to detect changed nodes if they have different node types", () => {
const oldvnode = h("span.c", { title: "b" });
const newvnode = h({ type: "#text", value: "test" });
const container = document.createElement("div");
const node = oldvnode.render();
container.appendChild(node);
expect(node.constructor).toEqual(HTMLSpanElement);
oldvnode.redraw({ node: node, vnode: newvnode });
expect(node).not.toEqual(container.childNodes[0]);
expect(container.childNodes[0].data).toEqual("test");
});
it("should provide redraw method to detect changed nodes if they have different text", () => {
const oldvnode = h({ type: "#text", value: "test1" });
const newvnode = h({ type: "#text", value: "test2" });
const container = document.createElement("div");
const node = oldvnode.render();
container.appendChild(node);
expect(node.data).toEqual("test1");
oldvnode.redraw({ node: node, vnode: newvnode });
expect(container.childNodes[0].data).toEqual("test2");
});
it("should provide redraw method to detect changed nodes and recurse", () => {
const oldvnode = h("ul.c", { title: "b" }, [
h("li#aaa"),
h("li#bbb"),
h("li#ccc"),
]);
const newvnode = h("ul.c", { title: "b" }, [h("li#aaa"), h("li#ccc")]);
const node = oldvnode.render();
oldvnode.redraw({ node: node, vnode: newvnode });
expect(oldvnode).toEqual(newvnode);
expect(node.childNodes.length).toEqual(2);
expect(node.childNodes[0].getAttribute("id")).toEqual("aaa");
expect(node.childNodes[1].getAttribute("id")).toEqual("ccc");
});
it("should provide a redraw method able to detect specific changes to style, data, value, props, $onrender and eventListeners", () => {
const fn = () => false;
const oldvnode = h("input", {
style: "margin: auto;",
data: { a: 111, b: 222, d: 444 },
value: "Test...",
title: "test",
label: "test",
onkeydown: () => true,
onclick: () => true,
onkeypress: () => true,
});
const newvnode = h("input", {
style: false,
data: { a: 111, b: 223, c: 333 },
title: "test #2",
label: "test",
placeholder: "test",
onkeydown: () => true,
onkeypress: () => false,
$onrender: () => true,
onhover: () => true,
});
const container = document.createElement("div");
const node = oldvnode.render();
container.appendChild(node);
oldvnode.redraw({ node: node, vnode: newvnode });
expect(oldvnode).toEqual(newvnode);
expect(node.style.cssText).toEqual("");
expect(node.dataset["a"]).toEqual("111");
expect(node.dataset["c"]).toEqual("333");
expect(node.dataset["b"]).toEqual("223");
expect(node.dataset["d"]).toEqual(undefined);
expect(node.getAttribute("title")).toEqual("test #2");
expect(node.getAttribute("placeholder")).toEqual("test");
expect(node.value).toEqual("");
});
it("should provide a redraw method able to detect changes in child content", () => {
const v1 = h("ul", [h("li", "a"), h("li", "b")]);
const n1 = v1.render();
const v2 = h("ul", {
$html: "<li>a</li><li>b</li>",
$onrender: (node) => node.classList.add("test"),
});
const v3 = h("ul", [h("li", "a")]);
const v4 = h("ul", [h("li", "b")]);
const n2 = v2.render();
const n3 = v3.render();
expect(n2.childNodes[0].childNodes[0].data).toEqual(
n1.childNodes[0].childNodes[0].data
);
v1.redraw({ node: n1, vnode: v2 });
expect(n1.classList[0]).toEqual("test");
expect(v1).toEqual(v2);
v3.redraw({ node: n3, vnode: v4 });
expect(v3).toEqual(v4);
});
it("should execute $onrender callbacks whenever a child node is added to the DOM", async () => {
let n;
const $onrender = (node) => {
n = node;
};
const vn1 = h("ul", [h("li")]);
const vn2 = h("ul", [h("li"), h("li.vn2", { $onrender })]);
const n1 = vn1.render();
vn1.redraw({ node: n1, vnode: vn2 });
expect(n.classList.value).toEqual("vn2");
const vn3 = h("ul", [h("span.vn3", { $onrender })]);
vn1.redraw({ node: n1, vnode: vn3 });
expect(n.classList.value).toEqual("vn3");
const rc = () => h("div.rc", { $onrender });
await h3.init(rc);
expect(n.classList.value).toEqual("rc");
const rc2 = () => vn2;
await h3.init(rc2);
expect(n.classList.value).toEqual("vn2");
});
});
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