基於angular7寫的一個指令，在ionic3.x項目在用。因爲加載圖片超時等原因導致圖片顯示不出來，需要替換成默認或者指定圖片
1.err-src.ts
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import { Directive,Input } from '@angular/core';
@ Directive({
selector: '[err-src]', // Attribute selector
host: {
'(error)': 'onError($event.target)'
}
})
export class ErrSrcDirective {
constructor() {}
private image = './assets/img/store_list/mo_icon_1.png';
@Input('err-src')
set backImg(img:string) {
if (img) this.image = img;
}
onError(e) {
e.src = this.image;
}
}
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2.err-src.module.ts
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import { NgModule } from '@angular/core';
import { ErrSrcDirective } from './err-src';
@NgModule({
declarations: [ErrSrcDirective],
imports: [],
exports: [ErrSrcDirective]
})
export class ErrSrcDirectiveModule {}
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3.用法 ：
注入指令
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import {NgModule} from '@angular/core';
import {IonicPageModule} from 'ionic-angular';
import {MinePage} from './mine';
import {HttpClientModule} from '@angular/common/http';
import { ErrSrcDirectiveModule } from '../../directives/err-src/err-src.module';
@NgModule({
declarations: [
MinePage,
],
imports: [
IonicPageModule.forChild(MinePage),
HttpClientModule,
ErrSrcDirectiveModule,
],
})
export class MinePageModule {
}
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html
<img src="{{baseInfo.photo || './assets/img/df-u-img.png'}}" err-src="./assets/img/df-u-img.png" alt="">
指令後面可替換默認圖片路徑，不寫的話默認圖片在指令裏面配置
