Enzyme - How to access and set <input> value?

Question

I'm confused about how to access <input> value when using mount. Here's what I've got as my test:

  it('cancels changes when user presses esc', done => {
    const wrapper = mount(<EditableText defaultValue="Hello" />);
    const input = wrapper.find('input');

    console.log(input.render().attr('value'));
    input.simulate('focus');
    done();
  });

The console prints out undefined. But if I slightly modify the code, it works:

  it('cancels changes when user presses esc', done => {
    const wrapper = render(<EditableText defaultValue="Hello" />);
    const input = wrapper.find('input');

    console.log(input.val());
    input.simulate('focus');
    done();
  });

Except, of course, the input.simulate line fails since I'm using render now. I need both to work properly. How do I fix this?

EDIT:

I should mention, <EditableText /> is not a controlled component. But when I pass defaultValue into <input />, it seems to set the value. The second code block above does print out the value, and likewise if I inspect the input element in Chrome and type $0.value in the console, it shows the expected value.

Answer 1

I think what you want is:

input.simulate('change', { target: { value: 'Hello' } })

Here's my source.

You shouldn't need to use render() anywhere to set the value. And just FYI, you are using two different render()'s. The one in your first code block is from Enzyme, and is a method on the wraper object mount and find give you. The second one, though it's not 100% clear, is probably the one from react-dom. If you're using Enzyme, just use shallow or mount as appropriate and there's no need for render from react-dom.

Answer 2

Got it. (updated/improved version)

  it('cancels changes when user presses esc', done => {
    const wrapper = mount(<EditableText defaultValue="Hello" />);
    const input = wrapper.find('input');

    input.simulate('focus');
    input.simulate('change', { target: { value: 'Changed' } });
    input.simulate('keyDown', {
      which: 27,
      target: {
        blur() {
          // Needed since <EditableText /> calls target.blur()
          input.simulate('blur');
        },
      },
    });
    expect(input.get(0).value).to.equal('Hello');

    done();
  });

Answer 3

With Enzyme 3, if you need to change an input value but don't need to fire the onChange function you can just do this (node property has been removed):

wrapper.find('input').instance().value = "foo";

You can use wrapper.find('input').simulate("change", { target: { value: "foo" }}) to invoke onChange if you have a prop for that (ie, for controlled components).

Answer 4

So lots of different opinions here. The only thing that worked for me was none of the above, it was using input.props().value. I hope that helps.

Answer 5

I am using create-react-app which comes with jest by default and enzyme 2.7.0.

This worked for me:

const wrapper = mount(<EditableText defaultValue="Hello" />);
const input = wrapper.find('input')[index]; // where index is the position of the input field of interest
input.node.value = 'Change';
input.simulate('change', input);
done();

Answer 6

None of the above worked for me. This is what worked for me on Enzyme ^3.1.1:

input.instance().props.onChange(({ target: { value: '19:00' } }));

Here is the rest of the code for context:

const fakeHandleChangeValues = jest.fn();
  const fakeErrors = {
    errors: [{
      timePeriod: opHoursData[0].timePeriod,
      values: [{
        errorIndex: 2,
        errorTime: '19:00',
      }],
    }],
    state: true,
  };
const wrapper = mount(<AccessibleUI
    handleChangeValues={fakeHandleChangeValues}
    opHoursData={opHoursData}
    translations={translationsForRendering}
  />);
const input = wrapper.find('#input-2').at(0);
input.instance().props.onChange(({ target: { value: '19:00' } }));
expect(wrapper.state().error).toEqual(fakeErrors);

Answer 7

This works for me using enzyme 2.4.1:

const wrapper = mount(<EditableText defaultValue="Hello" />);
const input = wrapper.find('input');

console.log(input.node.value);

Answer 8

here is my code..

const input = MobileNumberComponent.find('input')
// when
input.props().onChange({target: {
   id: 'mobile-no',
   value: '1234567900'
}});
MobileNumberComponent.update()
const Footer = (loginComponent.find('Footer'))
expect(Footer.find('Buttons').props().disabled).equals(false)

I have update my DOM with componentname.update() And then checking submit button validation(disable/enable) with length 10 digit.

Answer 9

In my case i was using ref callbacks,

  <input id="usuario" className="form-control" placeholder="Usuario"
                                                       name="usuario" type="usuario"
                                                       onKeyUp={this._validateMail.bind(this)}
                                                       onChange={()=> this._validateMail()}
                                                       ref={(val) =>{ this._username = val}}
                                                    >

To obtain the value. So enzyme will not change the value of this._username.

So i had to:

login.node._username.value = "mario@com.com";
    user.simulate('change');
    expect(login.state('mailValid')).toBe(true);

To be able to set the value then call change . And then assert.

Answer 10

This worked for me:

let wrapped = mount(<Component />);
expect(wrapped.find("input").get(0).props.value).toEqual("something");

Answer 11

I use Wrapper's setValue[https://vue-test-utils.vuejs.org/api/wrapper/#setvalue-value] method to set value.

inputA = wrapper.findAll('input').at(0)
inputA.setValue('123456')

Answer 12

.simulate() doesn't work for me somehow, I got it working with just accessing the node.value without needing to call .simulate(); in your case:

const wrapper = mount(<EditableText defaultValue="Hello" />);
const input = wrapper.find('input').at(0);

// Get the value
console.log(input.node.value); // Hello

// Set the value
input.node.value = 'new value';

// Get the value
console.log(input.node.value); // new value

Hope this helps for others!