tags | 易学教程

Mysql join query for multiple “tags” (many-to-many relationship) that matches ALL tags?

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问题 I am trying to query for Objects that match ALL of a given set of Tags. Basically I want users to be able to add on more and more Tags to filter or "narrow down" their search results, kind of like newegg.com does. My table structure is a table of Objects, a table of Tags, and a MANY:MANY relation table ObjectsTags. So I have a JOIN query like so: SELECT * FROM Objects LEFT OUTER JOIN ObjectsTags ON (Objects.id=ObjectsTags.object_id) LEFT OUTER JOIN Tags ON (Tags.id=ObjectsTags.tag_id) I tried

Best replacement for font tag in html

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问题 Since the font tag in HTML is being deprecated in HTML5 (and I understand why) is there a clean solution for applying certain attributes and styles to only portions of a paragraph text? I'm using JavaScript to parse an XML file that relies on the fact that the font tag allows portions of wrapping text to be formatted using class-based CSS. I realize the "anchor" ( a ) tag could also be used for this purpose, but that way seems very backwards and unnatural. EDIT When I asked this question (a

Calculate Position of selected text javascript/JQuery?

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问题 How to retrieve the position of selected text by calculating it's offset immediate after body tag? For Example consider the following html, <body> <div>hi</div> <div>dude!</div> </body> on selecting from "i" (in hi) to "du" (in dude), I need to get 2 as start position & 4 as end position. Note: Ignore the tag elements. Javascript is preferable! 回答1: Here's some simple, naive code to do this that may well do the job for your use case. It does not take into account any text that may be made

What was the <XMP> tag used for?

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问题 Does anyone remember the XMP tag? What was it used for and why was it deprecated? 回答1: A quick Google search on W3C reveals that XMP was introduced for displaying preformatted text in HTML 3.2 and earlier. When W3C deprecated the XMP tag, it suggested using the PRE tag as a preferred alternative. Update: http://www.w3.org/TR/REC-html32#xmp, http://www.w3.org/MarkUp/html-spec/html-spec_5.html#SEC5.5.2.1 回答2: XMP and PRE differ. Content within PRE tags is formatted as follows: Content is shown

What was the <XMP> tag used for?

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Will the <b> and <i> tags ever become deprecated?

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问题 (This is more of a curiousity question than any pending disaster :D ) So the <b> and <i> tags have been around since near the beginning of the web (I assume). But now we have CSS and many people apposing "stylistic html tags." They are stylistic tags, but they're really not so bad, as they save us from having to make a <span class="bold"> a whole bunch of times, reducing download times. Seeing as they don't take up much space, are easy to use, can possibly be useful to screen-readers, search

SVN pre-commit hook for avoiding changes to tags subdirectories

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问题 Is there anybody who has clear instructions on how to add a pre-commit hook that avoids changes to tags subdirectories? I already searched the internet quite a bit. I found this link: SVN::Hooks::DenyChanges , but I can't seem to compile things. 回答1: I don't have enough reputation to "comment" on Raim's answer above, but his worked great, with one exception, his grep pattern is wrong. I simply used the below as my pre-commit hook (I didn't have an existing one, you'd need to merge in that

What is the difference between an annotated and unannotated tag?

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问题 If I want to tag the current commit. I know both of the following command lines work: git tag <tagname> and git tag -a <tagname> -m '<message>' What is the difference between these commands? 回答1: TL;DR The difference between the commands is that one provides you with a tag message while the other doesn't. An annotated tag has a message that can be displayed with git-show(1), while a tag without annotations is just a named pointer to a commit. More About Lightweight Tags According to the

Are SVG parameters such as 'xmlns' and 'version' needed?

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问题 In about half of the svg examples I see on the internet, the code is wrapped in plain simple <svg></svg> tags. In the other half, the svg tags have lots of complicated attributes like this: <svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink"> My question is: is it ok to use the simple svg tags? I've tried playing around with the complicated ones, and everything works fine at my end if I don't include them. 回答1: All user agents (browsers) ignore the

Closing HTML <input> tag issue

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问题 I wonder why does the HTML <input> tags don't get a closing tag like other HTML tags and what would go wrong if we do close input tag ? I tried to Google and I found the standard to write a input tag like this <input type="text" name="name"> not closing it with a </input> . I personally felt the problem when I created a input tag for Radio buttons using var DOM_tag = document.createElement("input"); This though created radio button but the TextNode I appended to the radio button with document