I'm struggling with reactjs for no reason. I'm a little confused about the magic behind and I'm not able to perform a simple operation of adding object / removing object from an array and display it.
I my parent, I have a method which on click append a new element:
appendNewPma(){
var newPma = this.state.pma.slice();
newPma.push(PmaType1);
this.setState({pma:newPma})
}
then my render method is like that:
render() {
return (
<div>
<a className="waves-effect waves-light btn" onClick={this.appendNewPma}>new</a>
{this.state.pma.map((Item, index) => (
<Item
key = {index}
ref = {"pma" + index.toString()}
onDelete = {() => this.onDelete(index)}
title = {index}/>
))}
</div>
);
}
Append work fine, but my array doesn't contain an object to display but rather a magical function that I don't understand.
But when I try to delete an object:
onDelete(idx){
console.log(idx);
var pma = this.state.pma.slice();
pma.splice(idx, 1);
this.setState({pma:pma})
}
When I delete from the array, no matter what index I will remove, it will only remove the last object. I know my code is not ok, but I have no idea how you can render element for an array of object (here my array is list of function constructor). It will work better if I could get a straight ref to my object. Of course, I tryed to removed from the ReactDom, but was complening I was not updating from the parent...
I just want a simple array push/pop pattern with update.
Thanks for your help
Try below code. hope so it solve your issue.
addToArray = (event) => {
this.state.pma.push({"name ": "xyz"});
this.setState(
this.state
)
}
removeFromArray =(index) => {
var updatedArr = this.state.pma.splice(index, 1);
this.setState({arr : updatedArr})
}
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