More efficient way to set variable from multiple sources?

I am trying to set a variable in Javascript. I want the variable to use one of the foll开发者_运维问答owing.

1st choice if exists

$(this).attr("data-name");

2nd choice if above doesnt exist

$(this).attr("name");

3rd choice if neither above dont exist

$(this).attr("id");

And when I say doesnt exists I mean not null, not undefined and not blank.

I am not sure an efficient way to do this in javascript could use a bit of help on this.

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You can use the || operator:

var name = $(this).data('name') || this.name || this.id;

This says "use the data-name attribute; if it is falsy, use the name property; if it is falsy, use the id property."

Falsy values are:

• false
• null
• undefined
• an empty string
• the number 0
• NaN