getting an attribute-value in a class using javascript

Question

I don't know if this question has been asked here on SO, i just don't know the right word.

I have this input tag:

 <input type = "text" class="inputbox holdout-7"></input>

How do I get the holdout's value of 7 from the class using javascript?

This is because I wanted to add custom attributes but when the page is rendered, my custom attribute is not displayed. Some advised me to put them in a class instead.

For example:

<input type = "text" class = "inputbox" holdout="7"></input>

when the page is rendered, the holdout is not included, therefore I cannot get the value.

i want to store a value to a custom attribute, like holdout = 7. but the page does not render the holdout attribute that I used. it only renders default attributes like size, class, label etc.. — Break the Law
– Break the Law, Commented Mar 26, 2015 at 2:07
First, <input> elements do not have closing tags, secondly you should prepend data- to any custom attributes e.g. data-holdout="7" — dsgriffin
– dsgriffin, Commented Mar 26, 2015 at 2:11

mohamedrias · Accepted Answer · 2015-03-26 02:12:35Z

2

var inputBox = document.querySelector(".inputbox"),
    classname = inputBox.className,
    regEx = /holdout-(\d+)/,
    holdoutValue = classname.match(regEx)[1];

It will return you 7

To set that as attribute in your input box:

inputBox.setAttribute("data-holdout",holdoutValue);

it's recommended to use data-holdout instead of holdout.

edited Mar 26, 2015 at 2:12

answered Mar 26, 2015 at 2:06

mohamedrias

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9 Comments

Break the Law Over a year ago

Actually the holdout value is saved in the database and is configured when retrieving it. It is generated when I pass an XML parameter to my form. Where should i put the data-holdout? inside the class? sorry for noobish question.

mohamedrias Over a year ago

You must put it in the element as attribute

mohamedrias Over a year ago

Like <input type="text" class="inputbox" data-holdout="7"> This will give you the flexibility to retrieve the value easily either in javascript document.querySelector(".inputbox").getAttribute('data-holdout') or in jquery $(".inputbox").data("holdout")

Break the Law Over a year ago

I will try this first mohamedrias. Can this also be used in <field> tag? because I am passing the field as an XML type before the form is generated in the front end.

mohamedrias Over a year ago

DOM apis applies to both xml as well as html. So you can use setAttribute and getAttribute in both. When your generating the form use setAttribute to define the holdout

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