dom-events

Toggle Class based on scroll React JS

由 早过忘川 提交于 2019-12-20 12:36:48
问题 I'm using bootstrap 4 nav bar and would like to change the background color after ig 400px down scroll down. I was looking at the react docs and found a onScroll but couldn't find that much info on it. So far I have... I don't know if I'm using the right event listener or how to set the height etc. And I'm not really setting inline styles... import React, { Component } from 'react'; class App extends Component { constructor(props) { super(props); this.state = { scrollBackground: 'nav-bg' };

What's a workaround for Chrome for Android's incorrect clientX and clientY behavior?

由 谁说胖子不能爱 提交于 2019-12-20 09:48:55
问题 In Chrome for Android versions 16 and 18 (at least) there is a bug that reports clientX and clientY incorrectly. If the page is scrolled the values of clientX/Y will be incorrect for at least the touchstart event, though not the click event. There is a bug for it here: https://code.google.com/p/chromium/issues/detail?id=117754 Which contains this example, that you can try yourself: http://www.apprisant.com/tab/cd.html I have made a similar example with canvas here: http://codepen.io

Does Enter key trigger a click event?

由 荒凉一梦 提交于 2019-12-20 09:47:38
问题 In the code below removeSelectedCountry() should be called when a span element is clicked and handleKeyDown($event) should be called when there is a keydown event on a div . @Component({ selector: "wng-country-picker", template: ` <ul class="CountryPicker-selected" *ngIf="selectedCountries.length > 0"> <li *ngFor="let country of selectedCountries"> <span class="Pill Pill--primary" (click)="removeSelectedCountry(country)"> {{ country.name }} </span> </li> </ul> <div (keydown)="handleKeyDown(

Is it possible to add an eventlistener on a DIV?

由 感情迁移 提交于 2019-12-20 09:11:11
问题 I know this function: document.addEventListener('touchstart', function(event) { alert(event.touches.length); }, false); But is it possible to add this to a div? Example: document.getElementById("div").addEventListener('touchstart', function(event) { alert(event.touches.length); }, false); I haven't tested it yet, maybe some of you know if it works? 回答1: Yeah, that's how you do it. document.getElementById("div").addEventListener("touchstart", touchHandler, false); document.getElementById("div"

How exactly does the AngularJS Digest Loop work?

由 醉酒当歌 提交于 2019-12-20 07:16:09
问题 I am new to AngularJS and I am studying it on a tutorial. I have some doubt about the concept related to the Digest Loop provided by Angular. My application is composed by these 2 files: 1) index.html : <!DOCTYPE html> <html lang="en-us" ng-app="myApp"> <head> <title>Learn and Understand AngularJS</title> <meta http-equiv="X-UA-Compatible" content="IE=Edge"> <meta charset="UTF-8"> <!-- load bootstrap and fontawesome via CDN --> <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap

How do i trigger mouse events in fabric.js to simulate mouse actions?

由 ≡放荡痞女 提交于 2019-12-20 03:37:05
问题 I'm able to get the jquery response on the triggering but the fabric canvas is not acting on the event. I expect this fiddle to deselect the IText element: fiddle I know the fabric canvas got a trigger event, but it's not working too. var canvas = new fabric.Canvas("c"); var test = jQuery("#c"); test.on("mouse:down", function (){ alert("you clicked me"); canvas.renderAll(); debugger; }); canvas.on({"mousedown": function() { alert("you clicked me too"); }}); $("#testClick").click(function() {

Can I cancel location.href in Javascript

由 给你一囗甜甜゛ 提交于 2019-12-20 02:17:39
问题 It might sound silly, but I need this functionality. Can I somehow cancel location.href = 'url' in Javascript once it is executed? For example on click of button I am changing current page with some resource intensive page, I want to give an option to user so that one can cancel it if next page is going to take long time to load. 回答1: Yes you can. You can use the beforeunload event to display an alert that the user can confirm or cancel. When the user cancels it, the page navigation is

What is the function of google.maps.event.addDomListener(window, 'load', initialize);?

由 柔情痞子 提交于 2019-12-19 19:56:07
问题 I was trying Google maps. I found this statement. google.maps.event.addDomListener(window, 'load', initialize); what is the function of that statement ? 回答1: It adds a listener to the window object, which as soon as the load event is triggered (i.e. "the page has finished loading") executes the function initialize . I.e. it delays the Google Map related script until the page has finished loading. 回答2: @Dust function is initialize and it is called only after the <div> element is loaded. in

Communication from an injected script to the content script with a response

由 蓝咒 提交于 2019-12-19 09:09:21
问题 Following this question, communicating between an injected script and content script can be made that way: // Content script window.addEventListener("getChromeData", function(data) { // do Chrome things; }, false); // Injected script window.dispatchEvent(new CustomEvent("getChromeData", {data: 'whatever'})); I wanted to know if there is a way to make use of returned data into the injected script, using a promise or a callback mechanism? 回答1: The communication back is again done with an event.

Android WebView: Handle arrow keys in JavaScript

由 非 Y 不嫁゛ 提交于 2019-12-19 08:56:21
问题 I have a simple WebView application which I want to control with the keyboard. Is it possible to catch arrow keys in Javascript? I have tried the following code without any luck: function handleArrowKeys(evt) { console.info('key'); } document.onkeyup = handleArrowKeys; document.onkedown = handleArrowKeys; document.onkepress = handleArrowKeys; Javascript is enabled in the webview WebSettings webSettings = webview.getSettings(); webSettings.setJavaScriptEnabled(true); webSettings
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