javascript - How to get input type by element name - Stack Overflow

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Is there any way to get type of input by having element name?

<form name="formQuestionnaire">
    <input name="age" type="radio" id="age-1" />
    <input name="age" type="radio" id="age-2" />
</form>

document.forms['formQuestionnaire'].elements['age']

return radio / checkbox / text

Is there any way to get type of input by having element name?

<form name="formQuestionnaire">
    <input name="age" type="radio" id="age-1" />
    <input name="age" type="radio" id="age-2" />
</form>

document.forms['formQuestionnaire'].elements['age']

return radio / checkbox / text

• javascript
• dom-events

Share Improve this question Follow edited Jul 7, 2021 at 8:11 Brian Tompsett - 汤莱恩 5,8937272 gold badges6161 silver badges133133 bronze badges asked Mar 7, 2013 at 15:16 FuryFury 4,77677 gold badges5353 silver badges8282 bronze badges 1

• 1 Fire up the console in Chrome (press F12, click on console) and start typing things like document.forms and you'll see that you can explore the JavaScript DOM API. It's a pretty good way to learn. – Mikael Östberg Commented Mar 7, 2013 at 15:22

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 5

Try

var x = document.forms['formQuestionnaire'].elements['age'];
x = x.length ? x[0] : x;
alert(x.type)

Demo: Fiddle

<input type="age" name="age" type="radio" />

...
var input = document.getElementById('age');
alert(input.type);

You can also get type property:

var type = document.forms["formQuestionnaire"].elements["age"].type;

It is somewhat better than using getAttribute("type"), since in case of non defined type attribute (default is text) the latter gives null, while type property returns text, as it should be.

If you want more than one element. Fiddle

var x = document.forms['formQuestionnaire'].elements['age'];

for(var i=0;i< x.length;i++){
    
var u = x.length ? x[i] : x;
    
    alert(u.type);
    
}

<form name="formQuestionnaire">
    <input name="age" type="radio" id="age-1" />
    <input name="age" type="checkbox" id="age-2" />
</form>

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