Documentation
dojo.hasAttr¶
Available: | since V1.2 |
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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);
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- 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>