Question

我从后端获取数据并以视图行的形式绑定到视图中，然后我在表上调用datatable函数，但在视图显示行之前调用该函数。

$params['auth_type'] = 'rerequest';

Answer 1

找到解决方案

Section VPermutation_properties.

  Require Import Sorting.Permutation.

  Variable A:Type.

  Lemma ListVecPermutation {n} {l1 l2} {v1 v2}:
    l1 = list_of_vec v1 ->
    l2 = list_of_vec v2 ->
    Permutation l1 l2 ->
    VPermutation A n v1 v2.
  Proof.
    intros H1 H2 P; revert n v1 v2 H1 H2.
    dependent induction P; intros n v1 v2 H1 H2.
    - dependent destruction v1; inversion H1; subst.
      dependent destruction v2; inversion H2; subst.
      apply vperm_nil.
    - dependent destruction v1; inversion H1; subst.
      dependent destruction v2; inversion H2; subst.
      apply vperm_skip.
      now apply IHP.
    - do 2 (dependent destruction v1; inversion H1; subst).
      do 2 (dependent destruction v2; inversion H2; subst).
      apply list_of_vec_eq in H5; subst.
      apply vperm_swap.
    - assert (n = length l').
      { pose proof (Permutation_length P1) as len.
        subst.
        now rewrite list_of_vec_length in len.
      }
      subst.
      apply vperm_trans with (l' := vec_of_list l').
      -- apply IHP1; auto.
         now rewrite list_of_vec_vec_of_list.
      -- apply IHP2; auto.
         now rewrite list_of_vec_vec_of_list.
  Qed.

End VPermutation_properties.

这是正确的吗？

Answer 2

生命周期钩子JMeq_eq将在组件视图及其子视图初始化后调用。

试试这个

import { Component, OnInit } from '@angular/core';
import {HttpClient} from '@angular/common/http';
declare var $ :any;

@Component({
  selector: 'app-vendors',
  templateUrl: './vendors.component.html',
  styleUrls: ['./vendors.component.css']
})
export class VendorsComponent implements OnInit {

  vendors: any;
  dataRetrieved:any;
  constructor(private http:  HttpClient) { 
this.dataRetrieved=false;
  }

  ngOnInit() {

    this.http.get('backendLINK').subscribe(data => {
      // Read the result field from the JSON response.
      this.vendors = data['vendors'];
      this.dataRetrieved=true;
        // $("#vendors-datatable").DataTable({});

      console.log(this.vendors);
    });
  }
  ngAfterViewChecked() {
  if (this.dataRetrieved) {
   $("#vendors-datatable").DataTable({});
  }
}

}

Angular 4 - 在数据填充之前调用数据表

2 个答案: