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Make the bfcache in Internet Explorer work like Firefox

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问题 I have kind of the opposite problem of the accepted answer to this question: Ajax, back button and DOM updates There, most people wanted Firefox to fire "unload" event when coming Back to the page with the Back button. We manipulate the divs that are shown/hidden (navigating a tree), and go off to another page. When you click "Back", Firefox uses its bfcache and shows the page as it was when you left (this is good). IE shows the page in its initial state (this is bad). We want IE to behave

Can the Perl debugger save the ReadLine history to a file?

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问题 I work quit a bit with lib ReadLine and the lib Perl Readline. Yet, the Perl debugger refuses to save the session command line history. Thus, each time I invoke the debugger I lose all of my previous history. Does anyone know how to have the Perl debugger save, and hopefully, append session history similar to the bash HISTORYFILE ? 回答1: The way I do this is by having the following line in my ~/.perldb file: &parse_options("HistFile=$ENV{HOME}/.perldb.hist"); Debugger commands are then stored

How to change git commit message without changing commit hash

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问题 The title is not exact, but I can't express it better in a single line. I actually know how to change git commit message like here. But I know it always changes the SHA-1 too, which I want to avoid. I only want to see a different message in git-log . I thought it could be done somehow using git-notes , but I haven't managed it. Explanation: I need it in order to fix errors in the commit messages. I always write there the name of a document containing my communication with the customer (it

Hibernate, save the previous state of an object

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问题 Is there any generally accepted, proven-to-work way using hibernate, that keeps a history of an entitys changes in the database? We need to keep track of quite some objects and we want to be able to undo changes to objects. I tried using the interceptors of hibernate, but the old state of the object is only available when doing merge() . Mostly we do update() or saveOrUpdate() though... I'm currently letting warp-persist together with Guice manage the session. 回答1: I've done this with an

Dynamic JQuery Mobile Navigation

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I am having an issue with jQuery and how to dynamically process urls. What I would like to do is this if I have a page with links and each one has an id to call a function and an id. How can I change the url for the specific link and have that url work as a bookmark. Below is my code <div data-role="page" id="#listview"> <div data-role="header"> <h1>List</h1> </div> <div data-role="content"> <ul data-role="listview" id="carlist"> <li><a href="#" onclick="cardetails('1')">Acura</a></li> <li><a href="#" onclick="cardetails('2')>Audi</a></li> <li><a href="#" onclick="cardetails('3')>BMW</a></li>

jquery history plugin

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I am using this plugin: http://plugins.jquery.com/project/history on this page: http://www.crtaci.info/index.php?autocom=majice I dont know why but it seems i cant figure out what to do to get this to work... Guess i need more sleep... :) railscasts has an episode regarding this topic: http://railscasts.com/episodes/175-ajax-history-and-bookmarks I use the jQuery BBQ: Back Button & Query Library. It's simple, robust, and has a http://benalman.com/projects/jquery-bbq-plugin/ An alternative which I use is balupton's jQuery History which provides nice tracking of hash changes for your website.

数据量很大，分页查询很慢，怎么优化？

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当需要从数据库查询的表有上万条记录的时候，一次性查询所有结果会变得很慢，特别是随着数据量的增加特别明显，这时需要使用分页查询。对于数据库分页查询，也有很多种方法和优化的点。下面简单说一下我知道的一些方法。准备工作为了对下面列举的一些优化进行测试，下面针对已有的一张表进行说明。表名：order_history 描述：某个业务的订单历史表主要字段：unsigned int id，tinyint(4) int type 字段情况：该表一共37个字段，不包含text等大型数据，最大为varchar(500)，id字段为索引，且为递增。数据量：5709294 MySQL版本：5.7.16 线下找一张百万级的测试表可不容易，如果需要自己测试的话，可以写shell脚本什么的插入数据进行测试。以下的 sql 所有语句执行的环境没有发生改变，下面是基本测试结果： 1 select count(*) from orders_history; 返回结果：5709294 三次查询时间分别为： 8903 ms 8323 ms 8401 ms 一般分页查询一般的分页查询使用简单的 limit 子句就可以实现。limit 子句声明如下： 1 SELECT * FROM table LIMIT [offset,] rows | rows OFFSET offset LIMIT 子句可以被用于指定

Why the \G in SELECT * FROM table_name\G?

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问题 Terminating a MySQL query with \G instead of ; will cause MySQL to return the result set in vertical format, which is sometimes easier to read if the number of returned columns is large. Example: mysql> SELECT * FROM help_keyword LIMIT 3\G *************************** 1. row *************************** help_keyword_id: 0 name: JOIN *************************** 2. row *************************** help_keyword_id: 1 name: REPEAT *************************** 3. row *************************** help

How do you get the history of a file/folder property in SVN?

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What's the easiest way to determine when a property was set on a file or folder? Basically, I'm looking for an equivalent of "svn blame" that works on properties. The log subcommand enables one to get the complete history of a file or folder, including when the properties have been modified. However, it doesn't distinguish between a property modification and other types of modification, which of course also means that it won't tell you anything about the history of a particular property. The status command differentiates between properties and other types of modifications, but only works on

When the back button triggers popState how can I prevent a page refresh?

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问题 I am trying to modify the content in my page without a reload. Currently my code reads: window.onpopstate = function(event){ // Ajax Request the Page and replace content with new content }; This works when I push a state then trigger the popstate event, but if I press the back button in the browser it navigates to the url instead of calling my onpopstate event. How can I prevent a page refresh and update the page with my ajax call instead? edit: I am trying to update with pushState and