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>