Cordova警报按钮
我想在科多瓦的一个按钮上放个警报，我不明白为什么它不起作用。我用控制台启动了一个新的cordova空白项目。请参阅下面的代码：
index.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<link rel="stylesheet" type="text/css" href="css/index.css">
<title>Hello World</title>
</head>
<body>
<button id = "textlocal">Test Local</button>`
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/index.js"></script>
</body>
</html>index.js：
var app = {
// Application Constructor
initialize: function() {
this.bindEvents();
},
// Bind Event Listeners
//
// Bind any events that are required on startup. Common events are:
// 'load', 'deviceready', 'offline', and 'online'.
bindEvents: function() {
document.addEventListener('deviceready', this.onDeviceReady, false);
},
// deviceready Event Handler
//
// The scope of 'this' is the event. In order to call the 'receivedEvent'
// function, we must explicitly call 'app.receivedEvent(...);'
onDeviceReady: function() {
app.receivedEvent('deviceready');
document.getElementById("textlocal").addEventListener("click", textLocal);
},
// Update DOM on a Received Event
receivedEvent: function(id) {
var parentElement = document.getElementById(id);
var listeningElement = parentElement.querySelector('.listening');
var receivedElement = parentElement.querySelector('.received');
listeningElement.setAttribute('style', 'display:none;');
receivedElement.setAttribute('style', 'display:block;');
console.log('Received Event: ' + id);
},
function textLocal(){
alert('test');
}
};
app.initialize();可能我的textLocal()函数不是在正确的位置，但我无法理解如何修复它。非常感谢您的耐心和帮助。
回答 4
Stack Overflow用户
发布于 2016-07-04 16:20:07
您的代码中有一个JavaScript错误。请现在试试这段代码。也许您需要将"textLocal“侦听器添加到"deviceready”侦听器中。
码
var app = {
// Application Constructor
initialize: function() {
this.bindEvents();
},
// Bind Event Listeners
//
// Bind any events that are required on startup. Common events are:
// 'load', 'deviceready', 'offline', and 'online'.
bindEvents: function() {
document.addEventListener('deviceready', this.onDeviceReady, false);
},
// deviceready Event Handler
//
// The scope of 'this' is the event. In order to call the 'receivedEvent'
// function, we must explicitly call 'app.receivedEvent(...);'
onDeviceReady: function() {
app.receivedEvent('deviceready');
document.getElementById("textlocal").addEventListener("click", this.textLocal);
},
// Update DOM on a Received Event
receivedEvent: function(id) {
var parentElement = document.getElementById(id);
var listeningElement = parentElement.querySelector('.listening');
var receivedElement = parentElement.querySelector('.received');
listeningElement.setAttribute('style', 'display:none;');
receivedElement.setAttribute('style', 'display:block;');
console.log('Received Event: ' + id);
},
textLocal: function() {
alert('Test');
}
};
app.initialize();Stack Overflow用户
发布于 2016-07-04 16:39:14
您的代码有语法错误。
如果您不与按钮相关联，此函数将永远不会调用。
您需要放置一个onclick侦听器。您可以像这样使用onclick标记：
<button id="textlocal" onclick="textLocal()">Test Local</button> (无空间)
或者使用jquery
$("#textlocal").on("click", textLocal);
Stack Overflow用户
发布于 2016-07-04 17:22:38
从head标签中移除这个，然后尝试
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">如果仍然不能工作，则在加载DOM之前执行您的deviceready函数。因此，如果您正在使用jquery或只是在onload事件中，则应该将其放在$(document).ready中。顺便说一下，添加addEventListener并不适合这样简单的操作，只需使用onclick侦听器即可。
https://stackoverflow.com/questions/38188828
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