jQuery attr()

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The jQuery attr() method sets or returns the value of a property of selected elements.

Syntax:

When used to return an attribute’s value:

$(selector).attr(attribute)

When used to set an attribute and value:

$(selector).attr(attribute,value)

When used to set an attribute and value by using a function:

$(selector).attr(attribute,function(index,currentvalue))

When used to set multiple attributes and values:

$(selector).attr({attribute:value, attribute:value,...})

Attribute:

  • The attribute is a compulsory parameter of the jQuery attr() method, as it specifies the name of the attribute.

Value:

  • Value is a compulsory parameter of the jQuery attr() method, as it specifies the value of the attribute.

Function:

  • It is an optional parameter.
  • The function parameter is used to return the attribute value.

Index:

  • The index is an argument passed within the function.
  • It is used to give an index position to an element in the set.

Currentvalue:

  • This parameter is used to provide the current attribute value.

Example:

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("img").attr("width", "500");
});
});
</script>
</head>
<body>
<img src="img_girl.jpg" width="200" height="300">
<button>Click me</button>
</body>
</html>