React passing parameter via onclick event using ES6 syntax

Question

How to pass extra parameters to an onClick event using the ES6 syntax   For instance   handleRemove    e    gt        render           lt button onClick  this handleRemove  gt  lt  button gt      I want to pass an id to the handleRemove function like this    lt button onClick  this handleRemove id   gt  lt  button gt

User · Answer

Use the value attribute of the button element to pass the id, as

<button onClick={this.handleRemove} value={id}>Remove</button>

and then in handleRemove, read the value from event as:

handleRemove(event) {
...
 remove(event.target.value);
...
}

This way you avoid creating a new function (when compared to using an arrow function) every time this component is re-rendered.

User · Answer

in function component  this works great - a new React user since 2020    handleRemove    e  id    gt          removeById id      return  lt button onClick   e   gt  handleRemove e  id   gt  lt  button gt

User · Answer

TL DR   Don t bind function  nor use arrow functions  inside render method  See official recommendations   https   reactjs org docs faq-functions html    So  there s an accepted answer and a couple more that points the same  And also there are some comments preventing people from using bind within the render method  and also avoiding arrow functions there for the same reason  those functions will be created once again and again on each render   But there s no example  so I m writing one   Basically  you have to bind your functions in the constructor   class Actions extends Component        static propTypes             entity id  PropTypes number          contact id  PropTypes number          onReplace  PropTypes func isRequired          onTransfer  PropTypes func isRequired            constructor             super            this onReplace   this onReplace bind this           this onTransfer   this onTransfer bind this              onReplace             this props onReplace this props entity id  this props contact id              onTransfer             this props onTransfer this props entity id  this props contact id              render             return                lt div className  actions  gt                   lt button className  btn btn-circle btn-icon-only btn-default                      onClick  this onReplace                      title  Replace  gt                           lt i className  fa fa-refresh  gt  lt  i gt                   lt  button gt                   lt button className  btn btn-circle btn-icon-only btn-default                      onClick  this onTransfer                      title  Transfer  gt                       lt i className  fa fa-share  gt  lt  i gt                   lt  button gt                                                lt  div gt                     export default Actions   Key lines are   constructor  this onReplace   this onReplace bind this    method  onReplace         this props onReplace this props entity id  this props contact id       render  onClick  this onReplace

User · Answer

onClick  this handleRemove bind this  id

User · Answer

I am using React-Bootstrap  The onSelect trigger for dropdowns were not allowing me to pass data  Just the event  So remember you can just set any values as attributes and pick them up from the function using javascript  Picking up those attributes you set in that event target       let currentTarget   event target      let currentId   currentTarget getAttribute  data-id        let currentValue   currentTarget getAttribute  data-value

User · Answer

Use Arrow function like this    lt button onClick      gt  this handleRemove id    gt  lt  button gt

User · Answer

I use the following code    lt Button onClick  this onSubmit  id  item key  value  shop ethereum  gt      Approve  lt  Button gt    Then inside the method   onSubmit   async event   gt        event preventDefault        event persist        console log  Param passed   gt  Eth addrs     event target value      console log  Param passed   gt  id     event target id              As a result      Param passed in event    Eth addrs  0x4D86c35fdC080Ce449E89C6BC058E6cc4a4D49A6      Param passed in event     id  Mlz4OTBSwcgPLBzVZ7BQbwVjGip1

User · Answer

Remember that in onClick          the     is a JavaScript expression  So      onClick  this handleRemove id     is the same as  var val   this handleRemove id       onClick  val    In other words  you call this handleRemove id  immediately  and pass that value to onClick  which isn t what you want   Instead  you want to create a new function with one of the arguments already prefilled  essentially  you want the following   var newFn   function       var args   Array prototype slice call arguments         args 0  contains the event object   this handleRemove apply this   id  concat args          onClick  newFn    There is a way to express this in ES5 JavaScript  Function prototype bind       onClick  this handleRemove bind this  id     If you use React createClass  React automatically binds this for you on instance methods  and it may complain unless you change it to this handleRemove bind null  id    You can also simply define the function inline  this is made shorter with arrow functions if your environment or transpiler supports them       onClick       gt  this handleRemove id     If you need access to the event  you can just pass it along       onClick   evt    gt  this handleRemove id  evt

User · Answer

Something nobody has mentioned so far is to make handleRemove return a function   You can do something like   handleRemove   id   gt  event   gt         Do stuff with id and event       render      return  lt button onClick  this handleRemove id     gt    However all of these solutions have the downside of creating a new function on each render  Better to create a new component for Button which gets passed the id and the handleRemove separately

[reactjs] React passing parameter via onclick event using ES6 syntax

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