Jquery javascript - 链接选择教程与小提琴 [英] Jquery javascript - Chained Select Tutorial with fiddle
问题描述
我有一个创建链接选择的问题，最终通过一起修补多个SO解决方案找到解决方案。本着SO的精神，我发布了我的最终解决方案。它与jquery 1.10一起使用。
I had an issue creating a chained select, and eventually found the solution by patching several SO solutions together. In the spirit of SO, I'm posting my final solution. It works with jquery 1.10.
为了让大家快乐，我还包括了jsfiddle。 =）
And to make everyone happy, I also included the jsfiddle for it. =)
最终的JSFiddle在这里： http：// jsfiddle .net / NNLh2 /
Final JSFiddle is here: http://jsfiddle.net/NNLh2/
演练：
假设你有两个选择框： p>
Assume you have two select boxes:
<select id="my_alert_type_id" size="2" name="my_alert[type_id]">
<option value="1">Live</option>
<option value="2">EOD</option>
</select>
<br>
<br>
<select id="my_alert_category_id" name="myalert[category_id]" size="10">
<option>select a feed type</option>
</select>
我希望在用户从第一个选择中选择一个选项后，第二个选择选项进行更改。起初我使用了这个答案：
I want the second select options to change after the user selects an option from the first select. At first I used this answer from SO:
如何删除选择框的所有选项，然后添加一个选项并选择它与jQuery？
然后我发现，当页面实际上完成加载所有这些问题时，它必须运行：
And then I found out that it had to run when the page was actually done loading everything with this question:
但它仍然没有按照我想要的方式工作。在第一个框中我有两个选项，代码需要响应每个选择。我需要将它包装成一个if / then块，然后在选择时运行那个漂亮的代码。
But it still didn't work the way I wanted. I had two options in that first box, and the code needed to respond to each selection. I needed to wrap it into a if/then block, and THEN run that nifty bit of code when I had the selection.
Greaaaat。我是C＃/ php / ruby / C开发人员我对这些$和功能有什么了解？ Javascript尝试模拟C格式，所以我把它包装在一个if-then块中，并在这个问题的帮助下：
Greaaaat. I'm a C#/php/ruby/C developer; what the heck do I know about all those $'s and functions? Javascript tries to emulate C formatting, so I wrapped it in a if-then block, and with the help of this question:
我能够分配首先选择一个变量，然后运行漂亮的javascript替换选项部分。
I was able to assign the value of the first select to a variable, then run the nifty javascript replace-the-options part.
和中提琴！现在我有一个基本的链接选择工作。我可以通过调整附加部分替换任何我想要的。这是一个rails项目，所以下一部分是如何动态创建所有这些。但是现在我可以享受我的kludged解决方案，并得到这个项目。
And viola! Now I have a basic chained select that works. I can replace it any way I want by adjusting the append part. This is for a rails project, so the next part is how to create all this dynamically. But for now I'll enjoy my kludged solution and get on with the project.
对于rails来说，rails和js没有真正的交流，所以如果要动态创建附加选项，请使用escape_javascript，render和custom创建您要传递的URL。总是通过json传递它。还有其他有关SO的问题。去看看吧我不能为你做任何事情= P
For the rails people: rails and js don't really talk to each other, so if you want to create those appended option dynamically, use escape_javascript, render, and custom create the url you're passing. And there's always passing it via json. There are other questions on SO that talk about it. Go look it up; I can't do everything for you. =P
推荐答案
嗯，我几乎走过了上面的整个问题和解决方案，所以随时评论和批评。我为自己考虑jquery感到自豪，而JS不是我的伪造者。
Well, I pretty much walked through the entire problem and solution above, so feel free to comment and critique. I'm rather proud of myself considering jquery and JS aren't my forte.
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