ReactJS action form selection

This time I will bring you ReactJS operation form selection. What are theprecautions for ReactJS operation form selection?. Here is a practical case, let’s take a look.

The requirement is to implement single selection, inverse selection, multi-selection, and clear all operations on the list

...... this.state = { //初始化空数组，表示已经选择的 selectedStores:[], } ...... handleClick(e){ const newSelection = e.target.value;//拿到点击的具体一项 let newSelectionArray;//新建一个空数组 //判断点击项是否为选择状态，是的话清除选中状态 if(this.state.selectedStores.indexOf(newSelection) > -1) { newSelectionArray = this.state.selectedStores.filter((s:any) => s !== newSelection) } else { //不是的话就加入新选择数组 newSelectionArray = [...this.state.selectedStores, newSelection]; } this.setState({ // 新选择数组统一改为选中状态 selectedStores: newSelectionArray }); }

The Array.prototype.indexOf() method returns the firstindexwhere a given element can be found in the array, or -1 if it does not exist.

Grammar:

arr.indexOf(searchElement) arr.indexOf(searchElement[, fromIndex = 0])

The Array.prototype.filter() method creates a new array containing all elements of the test implemented by the providedfunction.

Grammar:

var new_array = arr.filter(callback[, thisArg])

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

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