jQuery Selector Summary, friends in need can refer to it, they are some commonly used selection control methods.
//jQuery selector$
//$(expression,[context]) return jQuery
//Unit One
//The CSS definer of expression is to express the element to be selected in CSS syntax
// $("*"); // Represents all element tags on the page
// $("th, td") // Represents all
// $("a") // Represents all element tags
// $("p#onlyp"); // Represents elements with id=onlyidv in CSS selection $("#ID ") matches the entire document
// $("#rating"); // Represents elements with id=rating
// $("#orderedlist > li"); // Represents all elements with id=orderedlist Child elements, but not including child elements under the child element
// $("#orderedlist li:last"); // Represents the last element of li in id=orderedlist
// $("#orderedlist li :first"); //Represents the first element of li in id=orderedlist
// $("#orderedlist li:nth- child(0)"); //Represents the (N) element of li in id=orderedlist The element n is the array subscript
// $("button:only-child"); //Indicates that it is the only element of the parent container in the css selection
// $(".stuff:empty" ); // Represents empty elements in css selection
// $(".buttons:enabled"); // Represents normally enabled elements in css selection
// $(".buttons:disabled" ); // Represents non-enabled elements in css selection
// $("input:checked"); // Represents selected elements in css selection
// $("button:not(.not )"); // Indicates the removal of elements in not() in css selection
// $("button.not"); // Indicates the elements with class=not in css selection $(".CLSS" ) matches the entire document
// $("#orderedlist2 li"); // Indicates all sub-elements of id=orderedlist and includes the sub-elements of all sub-elements
// //alert($("#orderedlist ~ li").length);
// $("#orderedlist,.buttons,li"); //Elements matching css selector
//expression of Select based on element attributes
// alert($("button[@class]").length); // Indicates elements with class attributes
// alert($("button[@class=not" ).length); // Indicates an element with a class attribute and a value equal to not
// alert($('button[@class^=not').length); // Indicates an element with a class attribute and a matching value at the beginning Elements of not
// alert($('button[@class$=not').length); // Indicates elements with class attributes and the end of the value matching not
// alert($('button [@class*=not').length); // Indicates elements with class attributes and values that match not
//expression of XPATH Filter XPATH syntax to indicate the page elements that need to be selected
//$("ol[@id^='orderedlist']").find("li:contains('First')").each(function(i) {
//// $ (this).html( $(this).html() + " BAM! " + i );
// $(this).mouseover(function(){
// $(this).css ("color","red");
// });
// $(this).mouseout(function(){
// $(this).css("color", "#000");
// });
// });
//Find all elements with the ol tag and the attribute id=orderedlist, there are two ways to write it
//ol [@id='orderedlist'] To locate the parent element, directly use each iteration
//ol[@id='orderedlist']/* For all child elements under the parent element, use find('child- element').each( )Iteration
//Unit two
///$(html, [ownerDocument]) return jQuery
//This function allows passing in html elements text, constructor A jQuery object created by this HTML text will be generated. This object may not exist originally, or it may exist on the original page.
//$('
hello
').appendTo("h2 "); //Generate a markup text and append it to the h2 tag of the page//You can also take out the original page element and append it
//$("input",this).appendTo("h2"); //Note that the page elements taken out here are moved! Not copied
///$(elements) return jQuery
//This function allows direct passing into the DOM
//$( document.forms[0].elements).appendTo("h2"); // You can refer to the DOM document
//$(callback) return jQuery
//The following is Some instructions for selector
/*
Basics:
#id: Get the object based on its id attribute.
element: All objects that match a certain HTML tag
.class: Get the object according to the class attribute of the object
*: Get all the objects
selector1, selector2, selectorN: Get a collection of multiple selectors without removing duplicates
Hierarchical selectors:
ancestor descendant: This selector is a space, which means that all objects of the first selector are found first, and then Find all objects that match the second selector among the descendant nodes of .
parent > child: This selector is the greater than sign, which means to first find all the objects of the first selector, and then find all the objects that match the second selector in its child nodes (not grand children). .
prev + next: This selector is the plus sign, which means to first find all the objects of the first selector, and then find the objects that follow the next node of the same level and also match the second selector.
prev ~siblings: This selector is the ~ sign, which means to first find all objects of the first selector, and then find objects that match the second selector in all subsequent nodes at the same level.
Basic filter characters:
:first: Match the first object among multiple objects
:last: Match the last object among multiple objects
:not(selector): Matches items with the content in the selector after not removed
:even: matches the even number among all objects
:odd: matches the odd number among all objects
:eq(index): matches a certain A single element in the following table
:gt(index): Matches all elements greater than a certain subscript
:lt(index): Matches all elements less than a certain subscript
:header: Matches all header elements, For example, h1, h2, h3, h4, h5, h6
:animated: Match all elements with animated effects
Text filter:
:contains(text): Match the text element that has the internal content Objects, including indirect useful situations
:empty: match all objects without child elements
:has(selector): match all objects that contain at least one child selector
:parent: match all parents Object, the parent object contains those objects that only contain text
Visibility filter:
:hidden: matches all hidden objects, or the hidden type in the input
:visible: matches all visible objects
Attribute filter:
[attribute]: Matches all objects with a certain attribute
[attribute=value]: Matches objects with a certain attribute and value
[attribute!= value]: Match objects that have a certain attribute and are not a certain value
[attribute^=value]: Match objects that have a certain attribute and start with a certain value
[attribute$=value]: Match objects that have a certain attribute and end with a certain value
[attribute*=value]: Match objects that have a certain attribute and contain a certain value
[selector1] [selector2][selectorN]: Match objects that match multiple attribute selectors at the same time
Child filter:
:nth- child(index/even/odd/equation): Match a certain subscript/even/odd/ in the child element For equation objects, :eq(index) can only match the characteristics of a child element of a single object, while this method can match the common characteristics of a certain child element of multiple objects
:first-child: Match the first child element
:last- child: Match the last child element
These two matchers can also match all child elements of multiple parent objects
:only-child: If If a parent element has only one child element, it will match this child element
Form filter character
Name Type
:input Returns: Array
Matching form Inner input element
:text Returns: Array
Match elements whose input type is text in the form
:password Returns: Array
:radio Returns: Array
Match elements in the form whose input type is radio
: checkbox Returns: Array
Match elements whose input type is checkbox in the form
:submit Returns: Array
Match the input type in the form is Submit elements
:image Returns: Array
Elements that match the image in the form
:reset Returns: Array
Match elements in the form whose input type is reset
:button Returns: Array
Match elements in the form whose input type is button
:file Returns: Array
Match elements whose input type is file in the form.
:hidden Returns: Array
Match elements whose input type is hidden in the form Element or hidden area
:enabled Returns: Array
Match all enabled elements
:disabled Returns: Array
Match all non-enabled elements
:checked Returns: Array
Match all selected elements
:selected Returns: Array
Match allDrop-down listSelected element
*/
The above is the detailed content of Summary of knowledge points about Selector in jQuery. For more information, please follow other related articles on the PHP Chinese website!

实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。

方法:1、用hide(),语法“$("textarea").hide()”;2、用slideUp(),语法“$("textarea").slideUp()”;3、用fadeOut(),语法“$("textarea").fadeOut()”。


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