我试图找出其工作原理:
var TestView = Backbone.View.extend({
views: {},
initialize: function(){
this.bind('transistion:complete', this.onPageLoaded);
},
onPageLoaded: function(){
alert("works!");
}
});
var v = new TestView();
v.trigger('transition:complete');
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但这不起作用:
var TestView = Backbone.View.extend({
views: {},
events:{
'transition:complete': 'onPageLoaded'
},
onPageLoaded: function(){
alert("works!");
}
});
var v = new TestView();
v.trigger('transition:complete');
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能够从视图的事件对象中触发我的自定义事件更简洁.无论如何我可以让这个工作吗?
我想使用post方法发送一个ajax请求,xml作为响应文本,是否可能,如果有可能请告诉我可能的方法.
对于Ex
url : "http://www.webservicex.net/CurrencyConvertor.asmx/ConversionRate"
data : {FromCurrency:"INR",ToCurrency:"AUD"}
method : GET or POST
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http://www.webservicex.net/CurrencyConvertor.asmx/ConversionRate?FromCurrency=INR&ToCurrency=AUD
我需要使用ajax来响应这个url.
在javascript中,我们以准并行方式触发函数
window.onload=function(){
document.getElementById("test").addEventListener('click', function1(), false);
//consider it takes 3 seconds to be completed
document.getElementById("test").addEventListener('click', function2(), false);
}
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我们如何能火function2()当function1()执行完毕?
在jQuery中,我们可以链接一系列函数(例如):
$(this).fadeIn(3000).fadeOut(2000);
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如何在纯JavaScript中进行此功能更改?
编辑:在回应否定评论和投票时,我提供了这个例子:
function delay(time, func){
setTimeout(func,time);
}
delay(2000,function(){alert('Function 1');});
delay(1000,function(){alert('Function 2');});
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在此示例中,您将首先看到"功能2"的警报.
我想从左到右滑动或移动图像
http://rajeevkumarsingh.wix.com/pramtechnology
阅读五角形框,移动好!
我尝试了一下但没有这样做我使用下面的代码
<script type="text/javascript">
<!--
var imgObj = null;
var animate ;
function init(){
imgObj = document.getElementById('myImage');
imgObj.style.position= 'absolute';
imgObj.style.top = '240px';
imgObj.style.left = '-300px';
imgObj.style.visibility='hidden';
moveRight();
}
function moveRight(){
if (parseInt(imgObj.style.left)<=10)
{
imgObj.style.left = parseInt(imgObj.style.left) + 5 + 'px';
imgObj.style.visibility='visible';
animate = setTimeout(moveRight,20); // call moveRight in 20msec
//stopanimate = setTimeout(moveRight,20);
}
else
stop();
f();
}
function stop(){
clearTimeout(animate);
}
window.onload =init;
//-->
</script>
<img id="myImage" src="xyz.gif" style="margin-left:170px;" />
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Firefox和IE也存在某种解决问题.如何解决它们.此外,我无法如此清楚地移动这些东西.这可能吗?我希望它与javascript而不是闪存.
所以我有一组"关联数组",即.对象,包含各种HTML元素的数据和其他一个参数,如下所示:
container[0] = { picker_canvas: document.getElementById("background_picker"),
color_canvas: document.getElementById("background_color"),
hex_text: document.getElementById("background_text"),
mouse_down: false };
container[1] = { picker_canvas: document.getElementById("textbox_picker"),
color_canvas: document.getElementById("textbox_color"),
hex_text: document.getElementById("textbox_text"),
mouse_down: false };
container[2] = { picker_canvas: document.getElementById("font_picker"),
color_canvas: document.getElementById("font_color"),
hex_text: document.getElementById("font_text"),
mouse_down: false };
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每个容器都有一个颜色选择器画布,一个颜色预览画布,一个显示十六进制颜色值的文本框和一个mouse_down布尔值的引用.稍后我通过遍历容器来初始化一些事件监听器,如下所示:
for (i=0; i<3; i++) {
container[i].picker_canvas.addEventListener("mousedown", function() {
container[i].mouse_down = true;
}, false);
container[i].picker_canvas.addEventListener("mouseup", function() {
container[i].mouse_down = false;
}, false);
container[i].picker_canvas.addEventListener("mousemove", function(evt) {
getColor(container[i], evt);
}, false);
container[i].hex_text.addEventListener("change", function(evt) {
drawColorSquare(container[i], evt.target.value)
}, false);
}
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但这不起作用,因为我变得未定义,所以我现在试图通过做这样的事情来获得正确的索引,但我不知道如何在javascript中实际实现它
container[i].picker_canvas.addEventListener("mousedown", function(evt) {
container[container.indexof(evt.target)].mouse_down = …Run Code Online (Sandbox Code Playgroud) javascript arrays indexing associative-array javascript-events
我想制作一个简单的javascript倒计时程序.由于某种原因倒计时触发,我不必单击开始链接.
<!DOCTYPE HTML>
<html>
<head>
<title id = "titleElement">My Top Ten Movies</title>
</head>
<body>
<p>Countdown Suren's favorite ten movies
<a href="" id = "start"> Start </a>
</p>
<table>
<thead>
<tr>
<td>Number</td>
<td>Movie</td>
</tr>
</thead>
<tbody id = "movieList">
</tbody>
</table>
<script src="js/practice.js"></script>
</body>
</html>
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和我的JavaScript文件......
//get the start element
var start = document.getElementById("start");
//register listener
start.addEventListener('click', startCountDown(), false);
function startCountDown()
{
//alert("Here!");
//creat the list of 10 movies
var myTenMovies = ["Breaveheart", "Mars Attacks", "Startship Troopers", "Jurassic Park", "Terminator 2", …Run Code Online (Sandbox Code Playgroud) 这三个事件之间有什么不同?
哪一个在其他之前/之后加载?
<body>
<script type='text/javascript'>
$(document).ready(function(){
console.log('Document %s',+new Date());
});
$('body').ready(function(){
console.log('Body %s',+new Date());
});
$(window).ready(function(){
console.log('Window %s',+new Date());
});
</script>
<div>hello world</div>
</body>
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奇怪的是,它们与我将它们放在代码上的顺序相同.对于当前的例子.document一个先发射,windows另一个发射.
ps我读过window.onload vs <body onload =""/>, window.onload vs document.onload和其他几个.
当这个监听器在事件发生后添加时,会JQuery运行传入的函数吗?$(window).load(callback)window.load
我不知道如何最好地解释这个问题,因为有很多事情要发生,所以我继续创造了一个我正在做的样本.以下是代码:
var cl = new Class();
cl.handleAction("triggerScream");
cl.handleAction('triggerDisplay');
function Class()
{
//function which will print static string
this.scream = function(){
document.write("AAAAAAA!!!<br/>");
}
//function which will print the class variable
this.display = function(){
document.write( this.color );
};
//sample class variable
this.color = 'red';
//map of actions
this.actions = {
'triggerDisplay' : this.display,
'triggerScream' : this.scream
};
//generic function that handles all actions
this.handleAction = function(action){
try{
this.actions[action]();
}catch(err)
{
document.write("Error doing "+action);
}
};
}
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这里是jsbin链接:http://jsbin.com/etimer/2/edit
在摘要中,有一个handleAction()函数,它处理各种事件并唤起其他函数来完成事件.为此,我有动作事件和功能的地图来唤起. …
我想unload在父窗口打开的子窗口上执行javascript .我尝试了下面的代码,它没有调用该函数.
childWindow = window.open(url, 'MyWindow', GetWindowOptions(1020, 600), true);
childWindow.onunload = function () { test(); };
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我写的测试功能是:
function test() {
alert(1);
}
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我正在使用IE8浏览器.