JQuery determines whether an element exists, and jquery determines the element

JQuery determines whether an element exists, and jquery determines the element

JQuery's principle of determining whether an element exists is slightly different from that of javascript, because $ the element selected by the selector does not return null or undefined no matter whether it exists. JQuery is used to determine whether the element exists, you can only use the length attribute, as shown below:

If ($ ("# element"). length> 0) {alert ("element is exist.");} else {alert ("element not be found ");}

Reference: jQuery code used to determine whether a page element exists _ jquery _ script house