Angular2/4/6将自定义管道筛选列表从HTML传递到组件
我目前正在开发一个搜索栏组件。使用自定义管道,我可以显示项目的下拉列表。我需要将过滤后的项目列表(项目| CustomPipe:search_输入)从searchbar.component.html传递到searchbar.component.ts,但我不确定如何传递 searchbar.component.htmlAngular2/4/6将自定义管道筛选列表从HTML传递到组件,angular,pipe,hidden-field,Angular,Pipe,Hidden Field,我目前正在开发一个搜索栏组件。使用自定义管道,我可以显示项目的下拉列表。我需要将过滤后的项目列表(项目| CustomPipe:search_输入)从searchbar.component.html传递到searchbar.component.ts,但我不确定如何传递 searchbar.component.html <ul *ngIf="(Items | CustomPipe : search_input).length>0" class="list-group dropdown-
<ul *ngIf="(Items | CustomPipe : search_input).length>0" class="list-group dropdown-container">
<li *ngFor="let item of Items | CustomPipe : search_input; index as i" [class.active]="i == arrowkeyLocation" (mouseover)=changeStyle($event)
(mouseleave)=changeStyle($event) (click)="showConfirm(item)" class="list-group-item" [innerHTML]="item.model | highlight : search_input"></li>
</ul>
<ul *ngIf="filteredContent.length>0" class="lis ...
我目前的做法是:
<input #filterSize type="hidden" value="{{(Items | CustomPipe : search_input).length}}">
<input #filterContent type="hidden" value="{{(Items | CustomPipe : search_input)}}">
searchbar.component.ts
export class SearchbarComponent implements OnInit {
arrowkeyLocation: number = 0;
@ViewChild('filterSize') filterSize: any;
@ViewChild('filterContent') filterContent: any;
@Output() onSelect: EventEmitter<number> = new EventEmitter<number>();
constructor() {
}
ngOnInit() { }
changeStyle(event) {
let content = this.filterContent.nativeElement.value;
let dropdownSize = this.filterSize.nativeElement.value;
if (event.type == "keydown") {
switch (event.keyCode) {
case 38: // this is the ascii of arrow up
if (this.arrowkeyLocation == -1) {
this.arrowkeyLocation = dropdownSize;
}
this.arrowkeyLocation--;
break;
case 40: // this is the ascii of arrow down
if (this.arrowkeyLocation == dropdownSize) {
this.arrowkeyLocation = -1;
}
this.arrowkeyLocation++;
break;
case 13:
this.onSelect.emit(content[this.arrowkeyLocation]);
break;
}
}
}
KeyPressCallback(search_input) {
this.filteredContent = utilityFunctionToFilter(Items, search_input);
// Do whatever you like with filteredContent.
}
导出类SearchbarComponent实现OnInit{
arrowkeyLocation:编号=0;
@ViewChild('filterSize')filterSize:any;
@ViewChild('filterContent')filterContent:任何;
@Output()onSelect:EventEmitter=neweventemitter();
构造函数(){
}
ngOnInit(){}
更改样式(事件){
让内容=this.filterContent.nativeElement.value;
让dropdownSize=this.filterSize.nativeElement.value;
如果(event.type==“keydown”){
开关(event.keyCode){
案例38://这是向上箭头的ascii码
如果(this.arrowkeyLocation==-1){
this.arrowkeyLocation=dropdownSize;
}
此.arrowkeyLocation--;
打破
案例40://这是向下箭头的ascii码
if(this.arrowkeyLocation==dropdownSize){
this.arrowkeyLocation=-1;
}
这个.arrowkeyLocation++;
打破
案例13:
this.onSelect.emit(内容[this.arrowkeyLocation]);
打破
}
}
}
但是,我无法正确检索对象列表(内容变量)。它作为[object object object]的字符串值从html传递到组件。任何人都可以建议解决方法吗?我可以提供解决方法
export class SearchbarComponent implements OnInit {
arrowkeyLocation: number = 0;
@ViewChild('filterSize') filterSize: any;
@ViewChild('filterContent') filterContent: any;
@Output() onSelect: EventEmitter<number> = new EventEmitter<number>();
constructor() {
}
ngOnInit() { }
changeStyle(event) {
let content = this.filterContent.nativeElement.value;
let dropdownSize = this.filterSize.nativeElement.value;
if (event.type == "keydown") {
switch (event.keyCode) {
case 38: // this is the ascii of arrow up
if (this.arrowkeyLocation == -1) {
this.arrowkeyLocation = dropdownSize;
}
this.arrowkeyLocation--;
break;
case 40: // this is the ascii of arrow down
if (this.arrowkeyLocation == dropdownSize) {
this.arrowkeyLocation = -1;
}
this.arrowkeyLocation++;
break;
case 13:
this.onSelect.emit(content[this.arrowkeyLocation]);
break;
}
}
}
KeyPressCallback(search_input) {
this.filteredContent = utilityFunctionToFilter(Items, search_input);
// Do whatever you like with filteredContent.
}
searchbar.component.html
<ul *ngIf="(Items | CustomPipe : search_input).length>0" class="list-group dropdown-container">
<li *ngFor="let item of Items | CustomPipe : search_input; index as i" [class.active]="i == arrowkeyLocation" (mouseover)=changeStyle($event)
(mouseleave)=changeStyle($event) (click)="showConfirm(item)" class="list-group-item" [innerHTML]="item.model | highlight : search_input"></li>
</ul>
<ul *ngIf="filteredContent.length>0" class="lis ...
hi pixelbits,很抱歉造成混淆,我已经重新表述了我的问题。我的自定义管道没有问题。只是我想为搜索栏实现一个按键事件,这样当用户按下enter键时,它就会转到正确的位置。为此,我需要从html中检索筛选的下拉列表,以便使用它在组件中的changeStyle方法中存在,但我不知道为什么要在列表和输入标记上使用自定义管道?是否有原因?并且您在列表和输入标记上有一些mouseover和mouseleave属性的拼写错误,您缺少“”。请尝试提供一个示例。