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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
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本文档描述您在使用App Inventor 2构建应用程序时所能用到的拓展，以打造界面更加酷炫、功能更加强大的App。
更多拓展请移步至《原版最全拓展一览》。
【实用小技...
How to explain callbacks in plain english? How are they different from calling one function from ano
...ned to a novice programmer?
The power of callbacks can easily be seen in AJAX-style websites which need to pull data from a server. Downloading the new data may take some time. Without callbacks, your entire User Interface would "freeze up" while downloading the new data, or you would need to refr...
Generate colors between red and green for a power meter?
...);
li {
font-size:8px;
height:10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<ul></ul>
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How to enable CORS in AngularJs
...n like POSTMAN, but when I try to GET from https://www.google.com using an AJAX call I get the CORS error? Is there no way I can make the AJAX call behave similarly to the call from POSTMAN?
– AjaxLeung
Jan 27 '16 at 17:14
...
Popstate on page's load in Chrome
I am using History API for my web app and have one issue.
I do Ajax calls to update some results on the page and use history.pushState() in order to update the browser's location bar without page reload. Then, of course, I use window.popstate in order to restore previous state when back-button i...
How to make a Bootstrap accordion collapse when clicking the header div?
...n.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<div class="container">
<div id="accordion">
...
jQuery posting JSON
...'
There's also a more detailed answer to a similar question here: Jquery Ajax Posting json to webservice
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How to fix java.net.SocketException: Broken pipe?
...
We've seen this exception when aborting an ajax request in the browser (using XMLHttpRequest.abort()).
– obecker
Jul 1 '13 at 15:30
2
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Prevent double submission of forms in jQuery
...;
};
Use it like this:
$('form').preventDoubleSubmission();
If there are AJAX forms that should be allowed to submit multiple times per page load, you can give them a class indicating that, then exclude them from your selector like this:
$('form:not(.js-allow-double-submission)').preventDoubleSubm...
Jquery mouseenter() vs mouseover()
...px;
width: 25px;
background-color: #aaa;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<div>MouseEnter: <span id="mouseenter">0</span></div>
<div>MouseOver: <span id="mouseover">0</span><...