CODEWITHSUNDEEP
javascriptjqueryreactjs
user5460152
user5460152

Reputation:

How to add a class with React.js?

I need to add the class active after clicking on the button and remove all other active classes.

Look here please: https://codepen.io/azat-io/pen/RWjyZX

var Tags = React.createClass({
  setFilter: function(filter) {
    this.props.onChangeFilter(filter);
  },
  render: function() {
    return <div className="tags">
      <button className="btn active" onClick={this.setFilter.bind(this, '')}>All</button>
      <button className="btn" onClick={this.setFilter.bind(this, 'male')}>male</button>
      <button className="btn" onClick={this.setFilter.bind(this, 'female')}>female</button>
      <button className="btn" onClick={this.setFilter.bind(this, 'child')}>child</button>
      <button className="btn" onClick={this.setFilter.bind(this, 'blonde')}>blonde</button>
     </div>
  }
});

var Kid = React.createClass({
  render: function() {
    return <ul>
      <li>{this.props.name}</li>
      </ul>
  }
});

var List = React.createClass({
  getInitialState: function() {
    return {
      filter: ''
    };
  },
  changeFilter: function(filter) {
    this.setState({
      filter: filter
    });
  },
  render: function() {
    var list = this.props.Data;
    
    if (this.state.filter !== '') {
      list = list.filter((i)=> i.tags.indexOf(this.state.filter) !== -1);
      console.log(list);
    } 
    
    list = list.map(function(Props){
      return <Kid {...Props} />
    });

    return <div>
      <h2>Kids Finder</h2>
      <Tags onChangeFilter={this.changeFilter}/>
      {list}
    </div>
  }
});

var options = {
  Data:  [{
    name: 'Eric Cartman',
    tags: ['male', 'child']
  },{
    name: 'Wendy Testaburger',
    tags: ['female', 'child']
  },{
    name: 'Randy Marsh',
    tags: ['male']
  },{
    name: 'Butters Stotch',
    tags: ['male', 'blonde', 'child']
  },{
    name: 'Bebe Stevens',
    tags: ['female', 'blonde', 'child']
  }]
};

var element = React.createElement(List, options);
React.render(element, document.body);

How do I make it better?

Upvotes: 70

Views: 274283

Answers (6)

jerryurenaa
jerryurenaa

Reputation: 4704

you can also use pure js to accomplish this like the old ways with jquery

try this if you want a simple way

warning: this may not be the correct way to do it in react.

 document.getElementById("myID").classList.add("show-example");

Upvotes: 3

Hritwij Shrivastava
Hritwij Shrivastava

Reputation: 41

const activeState = (e)=>{
    var id = e.target.id
    const idArray = ["homeBtn","aboutBtn","servicesBtn","portfolioBtn","testmBtn","blogBtn","contactBtn"]

    idArray.forEach((element)=> {
        document.getElementById(element).classList.remove("active")
    });
    console.log(id);
    document.getElementById(id).classList.add("active")

}

Upvotes: -1

RayLoveless
RayLoveless

Reputation: 21038

Taken from their site.

render() {
  let className = 'menu';
  if (this.props.isActive) {
    className += ' menu-active';
  }
  return <span className={className}>Menu</span>
}

https://reactjs.org/docs/faq-styling.html

Upvotes: 8

tomasbarrios
tomasbarrios

Reputation: 811

this is pretty useful:

https://github.com/JedWatson/classnames

You can do stuff like

classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', { bar: true }); // => 'foo bar'
classNames({ 'foo-bar': true }); // => 'foo-bar'
classNames({ 'foo-bar': false }); // => ''
classNames({ foo: true }, { bar: true }); // => 'foo bar'
classNames({ foo: true, bar: true }); // => 'foo bar'

// lots of arguments of various types
classNames('foo', { bar: true, duck: false }, 'baz', { quux: true }); // => 'foo bar baz quux'

// other falsy values are just ignored
classNames(null, false, 'bar', undefined, 0, 1, { baz: null }, ''); // => 'bar 1'

or use it like this

var btnClass = classNames('btn', this.props.className, {
  'btn-pressed': this.state.isPressed,
  'btn-over': !this.state.isPressed && this.state.isHovered
});

Upvotes: 26

Dayan Moreno Leon
Dayan Moreno Leon

Reputation: 5435

It is simple. take a look at this

https://codepen.io/anon/pen/mepogj?editors=001

basically you want to deal with states of your component so you check the currently active one. you will need to include

getInitialState: function(){}
//and 
isActive: function(){}

check out the code on the link

Upvotes: 47

wintvelt
wintvelt

Reputation: 14101

Since you already have <Tags> component calling a function on its parent, you do not need additional state: simply pass the filter to the <Tags> component as a prop, and use this in rendering your buttons. Like so:

Change your render function inside your <Tags> component to:

render: function() {
  return <div className = "tags">
    <button className = {this._checkActiveBtn('')} onClick = {this.setFilter.bind(this, '')}>All</button>
    <button className = {this._checkActiveBtn('male')} onClick = {this.setFilter.bind(this, 'male')}>male</button>
    <button className = {this._checkActiveBtn('female')} onClick = {this.setFilter.bind(this, 'female')}>female</button>
    <button className = {this._checkActiveBtn('blonde')} onClick = {this.setFilter.bind(this, 'blonde')}>blonde</button>
  </div>
},

And add a function inside <Tags>:

_checkActiveBtn: function(filterName) {
  return (filterName == this.props.activeFilter) ? "btn active" : "btn";
}

And inside your <List> component, pass the filter state to the <tags> component as a prop:

return <div>
  <h2>Kids Finder</h2> 
  <Tags filter = {this.state.filter} onChangeFilter = {this.changeFilter} />
  {list}
</div>

Then it should work as intended. Codepen here (hope the link works)

Upvotes: 5

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