In jquery, you can use the ":visible" selector and is() method to determine whether an element is displayed. The syntax is "element object.is(':visible')". You can check whether the specified element is displayed. Matches the ":visible" selector, that is, whether it is a visible element; if the element is displayed, it returns true.
The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.
In jquery, you can use the ":visible" selector and is() method to determine whether an element is displayed
is() method is used to view the selected Whether the element matches the selector.
-
: The visible selector selects each element that is currently visible.
Elements other than the following situations are visible elements:
is set to display:none
with Form elements with type="hidden"
width and height set to 0
hidden parent elements (this will also hide child elements )
Syntax to determine whether an element is displayed:
元素对象.is(':visible')
means to check whether the specified element matches ":visible "Selector, that is, whether it is a visible element
Example:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <script src="js/jquery-1.10.2.min.js"></script> <script> $(function () { $("button").click(function () { var node=$('span'); if(node.is(':visible')){ alert("显示元素"); }else{ alert("隐藏元素,将它显示出来"); node.show(); } }) }) </script> </head> <body> <div>这是一段可见的div内容。</div> <span hidden="hidden">这是一个被隐藏的内容,现在显示出来了。</span> <p>这是一段可见的内容。</p> <button>判断span元素是否显示</button> </body> </html>
[Recommended learning: jQuery video tutorial, web front-end video】
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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")”。

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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。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

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。

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。

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。


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