Attribute | Description |
Global | Attributes that are available to any HTML5 element. For comprehensive documentation of these attributes see: MDN Global attributes |
name | A string representing the name of an output. As a form element, output can be referenced by it’s name using the document.forms property. This attribute is also used for collecting values on a form submit. |
for | A space separated list of form element ids (e.g. <inputs id=“inp1”> for value is “inp1”) that the output is meant to display calculations for. |
form | A string representing the <form> that is associated to the output. If the output is actually outside the , <form> this attribute will ensure that the output still belongs to the <form> and subject to collections and submits of said <form>. |
The following demo features an <output> element’s use of the [for] and [form] attributes. Keep in mind, <output> needs JavaScript in order to function. Inline JavaScript is commonly used in forms as this example demonstrates. Although the <input> elements are type=”number”, their values are not numbers, they are text. So if you require the values to be calculated, you must convert each value into a number using methods such as: parseInt(), parseFloat(), Number(), etc.
Live demo
<!--form1 will collect the values of in1 and in2 on 'input' event.--> <!--out1 value will be the sum of in1 and in2 values.--> <form id="form1" name="form1" oninput="out1.value = parseInt(in1.value, 10) + parseInt(in2.value, 10)"> <fieldset> <legend>Output Example</legend> <input type="number" id="in1" name="in1" value="0"> <br/> + <input type="number" id="in2" name="in2" value="0"> </fieldset> </form> <!--[for] attribute enables out1 to display calculations for in1 and in2.--> <!--[form] attribute designates form1 as the form owner of out1 even if it isn't a descendant.--> <output name="out1" for="in1 in2" form="form1">0</output>
<output name="out1" form="form1" for="inp1 inp2"></output>
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