What am I doing wrong in this code, I don't know how else to write it I want to test the state invalidForm and render disabled or null depending.
state code UPDATE
if(valid) { return true; } else { this.setState({ invalidForm: true }) } } <button {this.state.invalidForm ? 'disabled' : null} type="submit">Submit</button> The Error I am getting is
Unexpected token, expected "..."
While you can define props without a value, you cannot do that dynamically. Pass a value:
<button disabled={this.state.invalidForm}>Submit</button> It shouldn't matter, but for clarity, if this.state.invalidForm is not a Boolean value, you can convert it to one:
<button disabled={Boolean(this.state.invalidForm)}>Submit</button> Running example:
ReactDOM.render( <div> <button disabled={true}>Button 1</button> <button disabled={false}>Button 2</button> </div>, document.body );<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>The parser expects ... because the {} syntax inside an opening "tag" is reserved for "spreading" props from objects.
For example:
const props = {disabled: true}; return <button {...props}>Submit</button> is the same as
return <button disabled={true}>Submit</button> 
invalidForm:true so how do I remove the disabled when the invalid form is !true
if ... else statement you should be doing this.setState({invalidForm: !valid});.
<button disabled={this.state.invalidForm ? 'disabled' : false} [...]