[javascript] How to select all textareas and textboxes using jQuery?

How can I select all textboxes and textareas, e.g:

<input type='text' />

and

<textarea></textarea>

on a page and have the property style.width="90%"; applied to them?

Simply use $(":input")

Example disabling all inputs (textarea, input text, etc):

$(":input").prop("disabled", true);

<form>_x000D_
  <textarea>Tetarea</textarea>_x000D_
  <input type="text" value="Text">_x000D_
  <label><input type="checkbox"> Checkbox</label>_x000D_
</form>_x000D_
_x000D_
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

$("**:**input[type=text], :input[type='textarea']").css({width: '90%'});

Password boxes are also textboxes, so if you need them too:

$("input[type='text'], textarea, input[type='password']").css({width: "90%"});

and while file-input is a bit different, you may want to include them too (eg. for visual consistency):

$("input[type='text'], textarea, input[type='password'], input[type='file']").css({width: "90%"});

names = [];
$('input[name=text], textarea').each(
    function(index){  
        var input = $(this);
        names.push( input.attr('name') );
        //input.attr('id');
    }
);

it select all textboxes and textarea in your DOM, where $.each function iterates to provide name of ecah element.