如何使用*ngFor多次重复HTML元素？
例如:如果我将成员变量赋值为20.如何使用*ngFor指令使div重复20次？
我正在尝试使用highlight.js为我的应用程序添加语法高亮,但它似乎不适用于Angular 2.
你能不能让我知道我可能做错了什么？
这是Plnkr:https://plnkr.co/edit/G3NFFPGXKyc9mV1a6ufJ ？ p = preview
这是组件
import {Component} from 'angular2/core';
@Component({
selector: "my-app",
template: `
Hello!
<pre>
<code class="html">
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
</code>
</pre>
`
})
export class AppComponent{
}
这是我使用cdn添加highlight.js的地方:
<!DOCTYPE html>
<html>
<head>
<!-- IE required polyfills, in this exact order -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/es6-shim/0.35.0/es6-shim.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.25/system-polyfills.js"></script>
<script src="https://npmcdn.com/angular2/es6/dev/src/testing/shims_for_IE.js"></script>
<!-- Angular polyfill required everywhere -->
<script src="https://code.angularjs.org/2.0.0-beta.13/angular2-polyfills.js"></script>
<script src="https://code.angularjs.org/tools/system.js"></script>
<script src="https://code.angularjs.org/tools/typescript.js"></script>
<script src="https://code.angularjs.org/2.0.0-beta.13/Rx.js"></script>
<script src="https://code.angularjs.org/2.0.0-beta.13/angular2.dev.js"></script>
<link rel="stylesheet" …将Clarity Design System从他们的官方教程添加到角度为2 5min的快速入门后,我收到了这个错误.浏览器控制台中的错误没有太大帮助,请问有什么建议吗？
zone.js:1382 GET http://localhost:3000/clarity-angular 404 (Not Found)
Error: (SystemJS) XHR error (404 Not Found) loading http://localhost:3000/clarity-angular(…)
app.module.ts
import {NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
import {ClarityModule} from 'clarity-angular';
import {AppComponent} from './app.component';
@NgModule({
imports: [BrowserModule,
ClarityModule],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule {
}
的index.html
<!DOCTYPE html>
<html>
<head>
<title>Angular QuickStart</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="styles.css">
<link rel="stylesheet" href="node_modules/clarity-icons/clarity-icons.min.css">
<script src="node_modules/mutationobserver-shim/dist/mutationobserver.min.js"></script>
<script src="node_modules/@webcomponents/custom-elements/custom-elements.min.js"></script>
<script src="node_modules/clarity-icons/clarity-icons.min.js"></script>
<link rel="stylesheet" …我在 Android 应用程序中使用 Mashape 的 API。Mashape 推荐使用 Unirest 库。我已经包含了 unirest 链接中提到的依赖项：http ://unirest.io/java
我的依赖：
compile fileTree(dir: 'libs', include: ['*.jar'])
compile group:'com.mashape.unirest', name:'unirest-java', version:'1.3.26'
compile group:'org.apache.httpcomponents', name:'httpcore', version:'4.3.3'
compile group:'org.apache.httpcomponents', name:'httpclient', version:'4.3.6'
compile group:'org.apache.httpcomponents', name:'httpasyncclient', version:'4.0.2'
compile group:'org.apache.httpcomponents', name:'httpmime', version:'4.3.5'
compile group:'org.json', name:'json', version:'20141113'
compile 'com.android.support:appcompat-v7:21.0.+'
当我发出 HTTPRequest 时，我仍然收到此错误：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/conn/HttpClientConnectionManager
at com.mashape.unirest.http.HttpClientHelper.prepareRequest(HttpClientHelper.java:153)
at com.mashape.unirest.http.HttpClientHelper.request(HttpClientHelper.java:133)
at com.mashape.unirest.request.BaseRequest.asJson(BaseRequest.java:68)
Disconnected from the target VM, address: '127.0.0.1:58805', transport: 'socket'
Caused by: java.lang.ClassNotFoundException: org.apache.http.conn.HttpClientConnectionManager
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method) …window.onload = function() {
console.log("Hello");
var button = document.getElementById("animateButton");
button.onclick = goProgress;
}
function goProgress() {
console.log("In goProgress()");
var progressBars = document.getElementsByClassName("progress");
for(var i=0;i<progressBars.length;i++){
console.log("Progress Bar " + (i+1) + ": " + progressBars[i]);
setInterval(increaseVal(progressBars[i]),10);
}
};
function increaseVal(progressBar){
console.log("In increaseVal(): " + progressBar.value);
if(progressBar.value<100){
progressBar.value = progressBar.value + 1;
}
}<progress class="progress" value="20" max="100"></progress>
<br>
<progress class="progress" value="0" max="100"></progress>
<br>
<progress class="progress" value="30" max="100"></progress>
<br>
<br>
<input type="button" value="Animate" id="animateButton"/>我正在使用VMware Clarity Design System UI(https://vmware.github.io/clarity/)并正在运行他们的种子应用程序.我正在尝试用我自己的品牌替换他们的品牌图标,但它的尺寸不同.我注意到该图标似乎是硬编码为36px x 36px.如果我尝试在CSS中设置新的大小,它仍然呈现为36px x 36px.这是硬编码的吗？
为什么*ngIf没有更新模板？无论isVisible在2秒后变为false,都会显示标题hello.
@Component({
selector: 'my-app',
template: `
<h1 *ngIf="isVisible == true">{{title}}</h1>
`
})
export class AppComponent {
title = 'Hello!';
isVisible = true;
constructor() {
setTimeout(function() {
this.isVisible = false;
console.log(this.isVisible);
}, 2000);
}
}
我在模态中有一个工具提示。
有没有办法可以避免工具提示被带有overflow它的容器剪掉？
我需要模态对话框来处理内容溢出，所以我无法从中删除overflow: auto。
body {
margin: 0;
}
.container {
display: flex;
height: 100vh;
align-items: center;
justify-content: center;
}
.modal-dialog {
display: block;
height: 50%;
width: 50%;
background: cyan;
border: 1px solid;
overflow: auto;
}
.tooltip {
position: relative;
color: red;
text-decoration: underline;
}
.tooltip::after {
display: none;
content: 'Hello';
position: absolute;
left: -100%;
top: -100%;
height: 20px;
width: 60px;
}
.tooltip:hover::after {
display: inline-block;
background: black;
color: white;
}<div class="container">
<div class="modal-dialog">
<span …视口大小较小时,表单字段会重叠.当空间不足时,有没有办法在下一行捕捉表单字段？
代码片段:
<form class="compact">
<div class="row">
<div class="col-xs-6">
<section class="form-block">
<div class="form-group">
<label for="aForm_1">This is a form field</label>
<input type="text" id="aForm_1" placeholder="Enter value here" size="45">
</div>
</section>
</div>
<div class="col-xs-6">
<section class="form-block">
<div class="form-group">
<label for="aForm_2">Overlapping Text</label>
<input type="text" id="aForm_2" placeholder="Enter value here" size="45">
</div>
</section>
</div>
</div>
</form>
这是plunker:https://embed.plnkr.co/ynfi39fIMk1bc8bSBHAp/
我有一个组件,当单击关闭按钮时可以从页面中删除该组件.我已经公开了一个testClose事件,用户可以在组件关闭时注册以完成一些工作.当组件关闭时,如何注册该事件以调用函数？例如,当TestComponent关闭时,我想将closeCounter增加1.这是plnkr:
https://plnkr.co/edit/iGyzIkUQOTCGwaDqr8o0?p=preview
暴露事件的TestComponent:
import {Component, Input, Output, EventEmitter} from 'angular2/core';
@Component({
selector: 'test',
template: `
<div class="box" *ngIf="!_close">
<button class="close" (click)="close()">x</button>
</div>
`,
styles:[
`
.box{
background: yellow;
height: 100px;
width: 100px;
}
`
]
})
export class TestComponent{
@Input("testClose") _close = false;
@Output("testCloseChange") _closeChange = new EventEmitter<boolean>(false);
close(): void{
this._close = true;
this._closeChange.emit(true);
}
open(): void{
this._close = false;
this._closeChange.emit(true);
}
}
App Component应该注册到TestComponent的close事件来调用某个函数.
import {Component} from 'angular2/core';
import {TestComponent} from './test.component';
@Component({
selector: "my-app",
template: ` …