jQuery learning summary: relative positioning and selectors of elements (continuously updated)_jquery

① Relative positioning of jQuery elements.
In jQuery, you can not only use selectors for absolute positioning, but also relative positioning. As long as the second parameter is specified in $(), the second parameter is the relative element. The second parameter is passed a jQuery object, and relative selection is performed relative to this object.

Copy code The code is as follows:

<script> <br>$(function(){ <br>//Set the background color of lines 1~3 to red (absolute positioning). <br>//Note the gt(0 here ) starts from the sequence number in the new sequence from lt(4), not the original one (that is, further filtering based on the original one) <br>$("#t tr:lt(4):gt(0). )").css("background","red"); <br>$("#t tr").click(function(){ <br>//This in Dom-->jQuery in $( this) <br>//$("td",$(this)) is relative to the search under tr of this line. td <br>$("td",$(this)).css("background"," green"); <br>}); <br>$("tr[title=ttt ]").css("background","yellow"); <br>}); <br></script>

< td>111 ;
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/td>

A
333	C
555	E
666	F
777	G
888	H
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Operation rendering:

②$("div[id]") selects the div with the id attribute
③$("div[title=test]") selects the div with the title attribute "test". Note: an equal sign.
$("div[title!=test]")Select a div whose title attribute is not "test"
④$("input:checked")Note : There is no space between input and :checked
⑤The difference between $("input") and $(":input")
$("input") can only be obtained tag, but , <select>, etc. cannot be obtained. <br>$(":input") can not only get the <input> tag, but also <textarea>, <select> and other forms submitted to the server. <br>Similar $(":text") gets all single-line text boxes, we can also use $("input[type=text]") to achieve the same function. Similar ones include $(":passowrd"), $(":radio"), $(":checkbox"), $(":submit"), $(":image"), $(":reset" ), $(":button"), $(":file"), $(":hidden")<br>⑥Use the attr() method to read or set the attributes of the element. For attributes that are not encapsulated by jQuery, use attr operates. <br>$("#a:first").attr("href","<a href="http://baidu.com/">http://baidu.com</a>");<br>⑦Remove attribute removeAttr, delete attribute in source code I can't see the difference between this and clearing the attributes. <br>⑧Dynamicly create Dom nodes <br>Use $(html string) to dynamically create Dom nodes and return a jQuery object, and then call append and other methods to add the created node to the Dom. <br>var link=$("<a href='http://www.baidu.com'>Baidu</a>");<br>$("div:first").append( link); The <br>append method is used to append an element to the end of the element (add a child element and become the last child element). The <br>prepend method adds an element to the beginning of the element (add a child element and become the first child element). <br>The after method adds an element after the element (adds a sibling) <br>The before method adds an element before the element (adds a sibling) <br>⑨Delete the node<br>remove() deletes the selected node, this method is the return value It is a deleted node object, and you can continue to use the deleted node. <br> var list=$("#ulLeft li.test").remove();<br> $("#ulRight").append(list);</p> <p><span style="COLOR: #ff00ff">Prevent event bubbling</span>e.stopPropagation();<br><span style="COLOR: #ff00ff">Prevent default behavior</span>: e.preventDefault() has the same effect as window.event.returnValue=false</p> <script type="text/javascript"> if ($ != jQuery) { $ = jQuery.noConflict(); } var isLogined = false; var cb_blogId = 74236; var cb_entryId = 2028486; var cb_blogApp = "JuneZhang"; var cb_blogUserGuid = "e4ae0e67-3a36-df11-ba8f-001cf0cd104b"; var cb_entryCreatedDate = '2011/4/25 17:46:00'; </script> </div> </div> </div> <div style="height: 25px;"> <div class="wzconBq" style="display: inline-flex;"> <span>Related labels：</span> <div class="wzcbqd"> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/search?word=relativepositioning" target="_blank">relative positioning</a> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/search?word=selector" target="_blank">Selector</a> </div> </div> <div style="display: inline-flex;float: right; color:#333333;">source：php.cn</div> </div> <div class="wzconOtherwz"> <a href="https://www.php.cn/faq/20161.html" title="Detailed example code of jQuery Ajax method calling Asp.Net WebService_jquery"> <span>Previous article：Detailed example code of jQuery Ajax method calling Asp.Net WebService_jquery</span> </a> <a href="https://www.php.cn/faq/20163.html" title="Share 14 cool jQuery navigation menu plugins_jquery"> <span>Next article：Share 14 cool jQuery navigation menu plugins_jquery</span> </a> </div> <div class="wzconShengming"> <div class="bzsmdiv">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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