/Javascript/jQuery/Jquery class selector

Jquery class selector

Jquery find tag and class

$(".txtClass")                  =>  getElementsByClassName()

$("#childDiv2 .txtClass")       =>  getElementById(),
                                    then getElementsByClassName()

$("#childDiv2 > .txtClass")     =>  getElementById(),
                                    then iterate over children and check class

$("input.txtClass")             =>  getElementsByTagName(),
                                    then iterate over results and check class

$("#childDiv2 input.txtClass")  =>  getElementById(),
                                    then getElementsByTagName(),
                                    then iterate over results and check class

Source: stackoverflow.com

Jquery selector this and class

$(".class").click(function(){
     $(this).find(".subclass").css("visibility","visible");
});

Source: stackoverflow.com

Jquery class selector

$(".className")

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