Getting and Setting Attribute Values With jQuery .attr()

jQuery attr: Main Tips

• The jQuery .attr() method sets or returns the values of the specified attributes of the selected elements.
• For attributes that haven't been set, this method will return undefined.
• To get or set properties of elements, use prop().

All the Ways of Using attr

The jQuery .attr() method can both set and return the values of the specified element attributes. To make jQuery set attribute value, follow this syntax:

$(selector).attr(attributeName, newValue);

In the example below, we set the height attribute's value to 200:

$("button").click(() => {
    $("img").attr("height","200");
});

Note: instead of naming newValue to make jQuery set attribute value, you can define a function that returns the value needed.

It is also possible to modify multiple attributes using jQuery .attr():

$(selector).attr({attributeName:newValue, attributeName:newValue, ...});

By skipping the newValue parameter, you make jQuery get attribute value:

$(selector).attr(attributeName);