无法更新 angular 中的子组件 属性

Question

我有一项过滤数据的功能。当我在过滤器弹出窗口中输入一些值时，它成功显示了结果。然后我将这些数据添加到本地存储中（因为我需要将这些数据保留在后面link）并且我正在重定向到另一个页面，当我按下当前页面上的后退按钮并导航到相同的过滤器组件时我需要从本地存储设置过滤器组件值，但我收到这样的错误 “无法在 SearchUserGridComponent.autoFillAdvanceSearch 处设置未定义的 属性 'status'” 我正在尝试在这个问题上很难请帮助。代码如下所示。

**SearchUserGridComponent.ts**



@ViewChild('callDialog', { static: true }) callDialog: TemplateRef<any>;

openUserAdvancedSearchPopup() {
        let dialogRef = this.dialog.open(this.callDialog,{
          width: "80vw",
          maxWidth: "1366px",
          disableClose: true
        });
      }

**search-user-grid.component.html**

<ng-template #callDialog let-ref>
    <div *ngIf="design?.is_advanced_search_enabled" class="advanced-search" [ngClass]="{'show-advanced-search':showAdvancedSearch}">
        <advanced-user-search-component *ngIf="searchColumns?.length>0" [columns]="searchColumns" [dropDown]="dropDown"
            (getSearchedParams)="getSearchedParams($event)" (getSearchedTerms)="getSearchedTerms($event)"
            backgroundColor="rgba(190, 190, 190, 0.4)">
        </advanced-user-search-component>
    </div>
   </ng-template>

**advanced-user-search.component.ts**

search() {
        debugger
        let params = new HttpParams();
        if (this.status != null && this.status != "A") {
            if (this.status == "AC") {
                params = params.append('isActive', "" + true)
            }
            else if (this.status == "I") {
                params = params.append('isActive', "" + false)
            }

        }
        if (this.passwordComplexity != null && this.passwordComplexity != "A") {
            if (this.passwordComplexity == "D") {
                params = params.append('IsDefaultPolicy', "" + true)
            }
            else if (this.passwordComplexity == "S") {
                params = params.append('IsDefaultPolicy', "" + false)
            }
        }
        if (this.userLockedUnlocked != null && this.userLockedUnlocked != "A") {
            if (this.userLockedUnlocked == "U") {
                params = params.append('IsLocked', "" + false)
            }
            else if (this.userLockedUnlocked == "L") {
                params = params.append('IsLocked', "" + true)
            }
        }
        if (this.selectedEntity && this.selectedEntity.entityId) {
            params = params.append('entities', "" + this.selectedEntity.entityId)
        }
        if (this.selectedEntityType != null) {
            params = params.append('entityTypes', "" + this.selectedEntityType)
        }
        // console.log(this.selectedRoles)
        if (this.selectedRoles != null) {
            let roleString = "";
            this.selectedRoles.forEach(role => {
                roleString = roleString + "," + role
            })
            params = params.append('roles', "" + roleString)
        }
        if (this.selectedBranch && this.selectedBranch.branchid) {
            params = params.append('branchid', "" + parseInt(this.selectedBranch.branchid));
        }
        this.getSearchedParams.emit(params);
        this.dialog.closeAll();
    }

当用户点击后退按钮时，这些方法将在 search-User-Grid.component.ts

上被调用

**SearchUserGridComponent.ts**

 ngAfterViewInit() {
  if (this.isBack == "true" && this.design.screen_name == "searchUsers") {
            this.showAdvancedSearch = true;
            this.autoFillAdvanceSearch();
          
        }
}

 @ViewChild("advancedSearchComponent", { static: false }) advancedSearchComponent: AdvancedUserSearchComponent;

 autoFillAdvanceSearch() {
        let userSearchData = JSON.parse(localStorage.getItem("userSearchData"))
        if (userSearchData != null && userSearchData != undefined) {

            if (userSearchData["search"] == undefined || userSearchData["search"] == null) {
                this.searchTerm = "";
            }
            else {
                this.searchTerm = userSearchData["search"];
            }

            let status = userSearchData["isActive"];
            if (status == "true") { // Status
                this.advancedSearchComponent.status = "AC";
            }
            else if (status == "false") {
                this.advancedSearchComponent.status = "I";
//**Error throwing from here it tells "Cannot set property 'status' of undefined at SearchUserGridComponent.autoFillAdvanceSearch"**//
            }
            else {
                this.advancedSearchComponent.status = "A";
            }

            let IsDefaultPolicy = userSearchData["IsDefaultPolicy"];
            if (IsDefaultPolicy == "true") { // IsDefaultPolicy
                this.advancedSearchComponent.passwordComplexity = "D";
            }
            else if (IsDefaultPolicy == "false") {
                this.advancedSearchComponent.passwordComplexity = "S"
            }
            else {
                this.advancedSearchComponent.passwordComplexity = "A";
            }

            let IsLocked = userSearchData["IsLocked"];
            if (IsLocked == "true") { // IsLocked
                this.advancedSearchComponent.userLockedUnlocked = "L";
            }
            else if (IsLocked == "false") {
                this.advancedSearchComponent.userLockedUnlocked = "U"
            }
            else {
                this.advancedSearchComponent.userLockedUnlocked = "A";
            }



            let entityTypes = userSearchData["entityTypes"];
            if (entityTypes != undefined && entityTypes != null && entityTypes != "") {
                this.advancedSearchComponent.selectedEntityType = Number(entityTypes);
                this.advancedSearchComponent.populateEntity();

            }

            let entityId = userSearchData["entities"];
            if (entityId != undefined && entityId != null && entityId != "") {
                this.advancedSearchComponent.selectedEntity.entityId = Number(entityId);
                this.advancedSearchComponent.getSelectedEntity(this.advancedSearchComponent.selectedEntity);

                setTimeout(() => {
                    this.advancedSearchComponent.selectedEntity.entityId = Number(entityId);
                    this.advancedSearchComponent.selectedEntity.name = this.advancedSearchComponent.entities.filter(entity => entity.entityId == Number(entityId))[0].name;
                }, 1000)
            }

            let roles = userSearchData["roles"];
            if (roles != undefined && roles != null && roles != "") {
                this.advancedSearchComponent.selectedRoles = roles.split(',').slice(1).map(i => Number(i));
            }

            let branchid = userSearchData["branchid"];
            if (branchid != undefined && branchid != null && branchid != "") {
                setTimeout(() => {
                    this.advancedSearchComponent.selectedBranch.branchid = Number(branchid);
                    this.advancedSearchComponent.selectedBranch.name = this.advancedSearchComponent.branches.filter(branch => branch.branchid == Number(branchid))[0].name;
                }, 1000)

            }

            
            let sortingEvent = JSON.parse(userSearchData["sortingEvent"]);
            if (sortingEvent != null && sortingEvent != '') {
                this.sort.direction = sortingEvent["direction"];
                this.sort.active = sortingEvent["active"];
            }


            setTimeout(() => {
                this.advancedSearchComponent.search()
            }, 1000)

            if (userSearchData["showAdvancedSearch"] == "true") {
                this.showAdvancedSearch = true
            }
            else {
                this.showAdvancedSearch = false
            }


        }
    }

Answer 1

此错误表示您的 advancedSearchComponent 未定义。这意味着您的 viewchild 找不到任何 ID 为 advancedSearchComponent 的项目。因此，只需将 #advancedSearchComponent 添加到您的 <advanced-user-search-component></advanced-user-search-component> 即可解决该问题。