DOM:element.hasAttribute

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« Gecko DOM Reference

Contents 1 Summary 2 Syntax 3 Example 4 Notes 5 Specification

[edit] Summary

hasAttribute returns a boolean value indicating whether the specified element has the specified attribute or not.

[edit] Syntax

result = element.hasAttribute(attName) 

• result holds the return value true or false.
• attName is a string representing the name of the attribute.

[edit] Example

// check that the attribute exists before setting a value 
var d = document.getElementById("div1"); 
if d.hasAttribute("align") { 
  d.setAttribute("align", "center"); 
}

[edit] Notes

DOM methods dealing with element's attributes:

Not namespace-aware, most commonly used methods	Namespace-aware variants (DOM Level 2)	DOM Level 1 methods for dealing with Attr nodes directly (seldom used)	DOM Level 2 namespace-aware methods for dealing with Attr nodes directly (seldom used)
setAttribute (DOM 1)	setAttributeNS	setAttributeNode	setAttributeNodeNS
getAttribute (DOM 1)	getAttributeNS	getAttributeNode	getAttributeNodeNS
hasAttribute (DOM 2)	hasAttributeNS	-	-
removeAttribute (DOM 1)	removeAttributeNS	removeAttributeNode	-

[edit] Specification

DOM Level 2 Core: hasAttribute