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    <p>I cannot answer you all questions, but probably could provide some relevant information, which can be useful.</p> <blockquote> <p>9 - Give your selectors a context:</p> </blockquote> <p>First one is more sophisticated, since that way you can pass an iframe element and lookup there. I don't think there is a difference in the performance.</p> <p>From documentation:</p> <blockquote> <p><strong>JQuery( expression, context)</strong><br> The core functionality of jQuery centers around this function. Everything in jQuery is based upon this, or uses this in some way. The most basic use of this function is to pass in an expression (usually consisting of CSS), which then finds all matching elements.</p> </blockquote> <p>By default, if no context is specified, $() looks for DOM elements within the context of the current HTML document. If you do specify a context, such as a DOM element or jQuery object, the expression will be matched against the contents of that context.</p> <blockquote> <p>14 - Even better, use jQuery's internal data() method to store state:</p> </blockquote> <p>This function can be useful for attaching data to elements without having to create a new expando. It also isn't limited to a string. The value can be any format. Class is more general, here you able to bind your data with element or set of elements. It can be used as metadata in some perspective. </p> <p>PS. You can find more information <a href="http://api.jquery.com/" rel="nofollow noreferrer">here</a></p>
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    1. POSome questions about the 25 jquery tips
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    1. COOn data vs classes, still, in a situation where you can use both, which one is preferred?
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    2. COto store state which related to some content I would prefer data, when we talking about state with further functional implication(see invokation) I would like to use objects.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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