JSX React HTML5 Input Slider Doesn't Work

Question

I'm using React.JS for a build, and am building a range input slider with two choices for a component.

this is my code:

<input id="typeinp" type="range" min="0" max="5" value="3" step="1"/> 

When I place it into my client side rendering component and try to toggle it it does not move at all. Testing it onto a JS/PHP build I have going on, it works fine.

Why does this not work in JSX/React.JS and what would be a suggested work around?

Thanks!

Answer 1

User interactions have no effect because an <input> with value prop is considered as controlled. It means that displayed value is controlled entirely by render function. So to actually update input value you should use the onChange event. Example:

getInitialState: function() {   return {value: 3}; }, handleChange: function(event) {   this.setState({value: event.target.value}); }, render: function() {   return (     <input        id="typeinp"        type="range"        min="0" max="5"        value={this.state.value}        onChange={this.handleChange}       step="1"/>   ); } 

You can also use defaultValue instead of value. In this case <input> is considered as uncontrolled and any user interactions are immediately reflected by element itself without invoking render function of your component.

More on this in official documentation

Answer 2

I think previous answers fix your problem. However, I'd say the solution doesn't need to involve React states.

The only reason behind your frozen input slider is that you've hardcoded its value to 3, as @Colin Whitmarsh suggests.

Simply, this works:

<input id="typeinp" type="range" min="0" max="5" defaultValue="3" step="1"/> 

Now, you probably need its output to do something. You can use onChange={this.handleChange} as @xCrZx states in his answer. But inside handleChange you don't necessarily have to update your state. Depending on your logic, you could avoid increasing the complexity of your state and simply code your logic inside handleChange.

If you avoid updating the state, you'll probably save some renders and your performance will improve.