dojo.hasAttr¶
| Available: | since V1.2 |
|---|
Contents
Checks a node for the presence of an attribute.
Introduction¶
dojo.hasAttr() is a companion function for dojo.attr. It checks if an attribute is present on a DOM node, and returns the truthy value if it is there, and falsy value otherwise.
Since 1.4 it will return true for standard properties that can’t have a corresponding attribute, e.g., innerHTML or class.
Usage¶
1 | result = dojo.hasAttr(node, attr);
|
- node
- id or reference of the DOM node to get/set style for
- attr
- the attribute property name.
- result
- truthy, if the attribute is present, falsy otherwise
Examples¶
Testing for attributes¶
The following example will check for several attributes.
<script type="text/javascript">
function checkAttributes(){
showAttribute("id");
showAttribute("type");
showAttribute("name");
showAttribute("innerHTML");
showAttribute("foo");
showAttribute("baz");
}
function showAttribute(name){
var result = dojo.hasAttr("model", name);
// I don't use dojo.create() here because it was not available in 1.2
var wrapper = dojo.doc.createElement("div");
dojo.place(wrapper, "out");
wrapper.innerHTML = "<input type='checkbox' disabled='disabled' " +
(result ? "checked='checked'" : "") + "> has " + name;
}
</script>
<p><input id="model" name="model" baz="foo"> — our model node</p>
<p><button onclick="checkAttributes();">Check attributes</button></p>
<p id="out"></p>