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fix:type no longer clips final character with negative maxlength #239

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fix:type no longer clips final character with negative maxlength #239

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9e8b70d
fix:type no longer clips final character with negative maxlength
cbacon91 Mar 21, 2020
ebdb961
clarify intent behind maxLength check
cbacon91 Mar 28, 2020
83d4f5c
Merge branch 'master' into master
cbacon91 Mar 28, 2020
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18 changes: 18 additions & 0 deletions __tests__/react/type.js
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Expand Up @@ -31,6 +31,24 @@ describe("userEvent.type", () => {
expect(getByTestId("input")).toHaveProperty("value", "hello world");
});

it.each(["input", "textarea"])(
"includes entire textstring with negative maxlength in <%s>",
type => {
const onChange = jest.fn();
const { getByTestId } = render(
React.createElement(type, {
"data-testid": "input",
onChange: onChange,
maxLength: -1
})
);
const text = "Hello, world!";
userEvent.type(getByTestId("input"), text);
expect(onChange).toHaveBeenCalledTimes(text.length);
expect(getByTestId("input")).toHaveProperty("value", text);
}
);

it("should append text all at once", () => {
const onChange = jest.fn();
const { getByTestId } = render(
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18 changes: 18 additions & 0 deletions __tests__/vue/type.js
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Expand Up @@ -27,6 +27,24 @@ describe("userEvent.type", () => {
expect(getByTestId("input")).toHaveProperty("value", text);
});

it.each(["input", "textarea"])(
"includes entire textstring with negative maxlength in <%s>",
type => {
const input = jest.fn();

const { getByTestId } = renderComponent(
type,
{ input },
{ maxLength: -1 }
);

const text = "Hello, world!";
userEvent.type(getByTestId("input"), text);
expect(input).toHaveBeenCalledTimes(text.length);
expect(getByTestId("input")).toHaveProperty("value", text);
}
);

it("should not type when event.preventDefault() is called", () => {
const input = jest.fn();
const change = jest.fn();
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3 changes: 2 additions & 1 deletion src/index.js
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Expand Up @@ -183,7 +183,8 @@ const userEvent = {
};
const opts = Object.assign(defaultOpts, userOpts);

const computedText = text.slice(0, element.maxLength || text.length);
const maxLength = element.maxLength > 0 ? element.maxLength : text.length;
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From the MDN documentation:

The maxlength attribute defines the maximum number of characters (as UTF-16 code units) the user can enter into an or <textarea>. This must be an integer value 0 or higher. If no maxlength is specified, or an invalid value is specified, the input or textarea has no maximum length.

So it seems like we wouldn't want to check for maxLength > 0, because 0 is a valid value for maxLength. It needs to check for >= 0 instead, which necessitates another test for maxLength: 0

@a-bates

const computedText = text.slice(0, maxLength);

const previousText = element.value;

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