JavaScript增量数组
嗨,这是我的json值JavaScript增量数组,javascript,reactjs,primereact,Javascript,Reactjs,Primereact,嗨,这是我的json值 constructor() { super(); this.exportpdf = this.exportpdf.bind(this); this.state = { sales: [ { customStudentId: "2064517", studentRoll: 26, studentName: "Md. Faiaz Jakir ", stdCtExamMarks: [
constructor() {
super();
this.exportpdf = this.exportpdf.bind(this);
this.state = {
sales: [
{
customStudentId: "2064517",
studentRoll: 26,
studentName: "Md. Faiaz Jakir ",
stdCtExamMarks: [
{
viewSerial: 1,
subjectName: "Bangla ",
subjectFullMark: 25,
obtainedMark: 0,
highestMarks: 25
}
]
},
{
customStudentId: "2065817",
studentRoll: 27,
studentName: "Miraj Bin Atik ",
stdCtExamMarks: [
{
viewSerial: 1,
subjectName: "English ",
subjectFullMark: 25,
obtainedMark: 0,
highestMarks: 25
}
]
}
]
};
}
这里我使用的是primereact数据表。这是我用来在表中显示数据的代码>
<DataTable value={this.state.sales[0].stdCtExamMarks}>
<Column field="subjectName" header="Subject" />
<Column field="subjectFullMark" header="Full Mark" />
<Column field="obtainedMark" header="Obtainedn Mark" />
<Column field="highestMarks" header="Highest Mark" />
</DataTable>
对于this.state.sales[0].stdctexamarks
我得到的值是
但是我需要json数据中的stdCtExamMarks值(等等)。我怎么做
但是我需要json数据中的stdCtExamMarks值(等等)。
我怎么做
那么您需要从数组中的每个对象中提取stdCtExamMarks
?您可以使用映射来执行此操作。它将返回映射对象的数组:
<DataTable value={this.state.sales.map(sale => sale.stdCtExamMarks)}>
sale.stdCtExamMarks)}>
控制台日志的输出是(2)[Array(1),Array(1)]
并且没有向表中推送任何值。当我将代码更改为sales.stdCtExamMarks[0])}>
<非常感谢:)哦,我没有注意到它的na数组,捕捉得好!