Listen to html5 autofocus - javascript

I have a html form that I want it to be autofocused when a user loads a page.
<form>
<input type=text name='username' id='input1' autofocus>
I have Javascript that is meant to add a css class( shift-up ) to the input to style it when the input is in focus.
`var x=document[forms][input1];
x.addEventListener('focus', inputFocus);
function inputFocus {
x.classList.add('shift-up');
} `
My problems:
This class is not added to the input tag when a user loads the page and yet the input field is focused. But when you click manually, then the class is added.
Is there any way I could also listen to the html5 autofocus using Javascript??

Just use the :focus selector in your CSS instead. No need for JavaScript add/remove classes.

Instead of taking use of "difficult" JavaScript code to get your <input> work. Make use of the :focus option in CSS, which already exists and is way simpler than try to code your own focus with an EventListener.
HTML Code:
<input type=text name='username' class="placeholder">
CSS Code:
.placeholder:focus{
}

Related

How can I use setAttribute on an input without an ID or class attribute?

I have a search input tag that is being added by a jQuery plug-in:
<input type="search" />
Note that this does not have an ID, CLASS, or NAME. I need the search input tag to look like this:
<input type="search" name="myname" />
A simple solution is for me to update the jQuery plug-in. However, I do not want to do this as it will cause challenges when I upgrade this plug-in in the future.
This JavaScript works properly and adds the name attribute:
$(document).ready(function() {
document.getElementsByTagName("input")[0].setAttribute("name", "myname");
});
The problem is that the "[0]" in this function relies on the search input being the first input field in the form. I do not think this solution is sustainable.
There are other inputs in the form. This is the only one with the type attribute equal to "search." Is there a way to identify it by this attribute? Or, is there another solution you propose?
Thank you for your time!
You can use the document.querySelector:
document.querySelector("input[type='search']")
Below is an example (you can inspect the output to see name attribute):
document.querySelector("input[type=search]").setAttribute("name", "myname");
<input type="search" value="foo" />
<input type="bar" value="bar" />
You can target a selection by anything. So, the selector input[type="search"]' will work.
If you want to apply this to all input's of type search, this is good enough, and you get all of them in here:
$('input[type="search"]')
This works without jQuery too:
document.querySelectorAll('input[type="search"]')
A more targeted approach would be
document.querySelectorAll('div.filter input[type="search"]')

jQuery: Make a text input box selected

You know how when you open a new tab, you can start typing without having to select the search bar? I've got a text input box in HTML, and I'd like to be able to open my webpage and have that text input box immediately typeable, for lack of a better term. Say my input box looks like this:
<input type="text" class="myInput" value="add an item"></input>
I'm using HTML, CSS and JavaScript/jQuery right now. What code can I add to make sure the text input box is immediately typeable?
Use autofocus:
<input type="text" class="myInput" value="add an item" autofocus/>
From the input documentation on MDN:
This Boolean attribute lets you specify that a form control should have input focus when the page loads, unless the user overrides it (e.g. by typing in a different control). Only one form element in a document can have the autofocus attribute, which is a Boolean. It cannot be applied if the type attribute is set to hidden (that is, you cannot automatically set focus to a hidden control). Note that the focusing of the control may occur before the firing of the DOMContentLoaded event.
<input type="text" class="myInput" value="add an item" autofocus>
https://www.w3schools.com/TAgs/att_input_autofocus.asp
in html use autofocus, in jquery use $('.myInput').focus()

What is document.f.q.focus?

What is document.f.q.focus?
Is this a java script code or not
whether I can use document.f.id.value?
what is the difference between this and document.getElementbyID()
The HTML looks like this:
<form name="f">
<input name="q" />
</form>
In such a case, document.f refers to the form, and .q refers to the input element of that form. .focus() places the focus on that input.
It's worth noting that such code is unnecessary now that HTML5 is around:
<input name="q" autofocus />
It needs a form to make it work, Try this:
<form name="f">
<input name="q" value="test" type="text"/>
</form>
javascript:
document.f.q.focus();
document.f.q.value = 1;
Here is DEMO
The id attribute inside a html is meant to be unique.name can be an array(file[]) and with html5 should be used only on form elements.
html5 removed the support of the name atrribute on most elements except form elements.
id and name are 2 different things.
document refers to the whole html inside a page.
to get an element by it's id you need to call document.getElementById(id);
to get an element by it's name (considering html5) so inside a form
you call document.forms[0].name. form[0] refers to the first form inside the document
In your case the form has also a name so appart from html5 the code is correct.
form is called f,input is called q. thats why document.f.q returns the input field.
if you want to add an id to your input field then you have to add an id:
<input name="q" id="q">
to get the element:
document.getElementById('q');
to return the content:
document.getElementById('q').value;
And focus(); is a native function that points the focus to the choosen element.
In your case when you load the page you will see the blinking pointer inside the searchflied.

How to select the content inside a textbox when loading the page?

I'm working on an application, and I want a text field to be selected when the page is loading so that when a user uses Ctrl + v it paste the content inside the textbox. Any one knows how to do that?
the text field is
<div>
<input wicket:id="email-address" type="text" id="textbox-email" />
</div>
Thanks!
3p3r answer is of course perfectly right. If you want this to be reusable and contolled via wicket, than please check the wicket wiki page.
You can use HTML5's autofocus attribute:
<input type="text" autofocus />
Works of course for just one field.
you should set focus to your input:
document.forms['your_form'].elements['your_textbox'].focus();
For your example above:
document.getElementById('textbox-email').focus()
After it gained focus, you should select it:
either add this onfocus attribute to your inputs (better)
<input type="text" onfocus="this.select()" />
Or use this jQuery snippet (best):
$(document).ready(function() {
$("#textbox-email").focus(function() { $(this).select(); } );
});
Pure Javascript:
var element = document.getElementById('textbox-email');
element.onfocus = function() {element.select();}
document.getElementById('textbox-email').focus();
Add the whole thing to window.onload or onload attribute of body tag.

Setting a label's for attribute to a DOM element, not an ID in jQuery

Short Question:
How do you link a label element to an input element without using the input element's id using jQuery and javascript?
Long Question:
I am using jQuery to clone a form with possibly more than one instance of the form being available for the user to fill in.
A label's 'for' attribute is supposed to be set to the 'id' attribute of the input element that it is for. This works when the input element has a unique id.
Because I am cloning the same input element there will be multiple input elements with the same id in the document. Therefore I'm avoiding having id attributes for input elements but I'd still like to focus on the input element when the label is clicked. I also want to avoid generating random ids for fields or setting onclick events on labels.
Edit #1
Example mark up (note no ids)
<form>
<label>First Name:</label><input type='text' name='FirstName' /><br/>
<label>Last Name:</label><input type='text' name='LastName' /><br/>
</form>
Example cloning code:
var newForm = $('form').clone();
$(newForm).find('label').each(function(){
var inputElement = $(this).next('input');
// I'd love to set the label's for attribute to an element
$(this).attr('for', inputElement);
});
$(document).append(newForm);
Edit #2
There currently are three options:
Set onclick events for labels to focus on the input field they're for. Criteria for deciding which labels are for which inputs can be the next input element or something else
Embed the input fields in the label fields (might not be possible due to designer's choices)
Generate random ids while cloning each form
Well it would be nice to see the markup, but if i can assume that the markup will look somewhat like this
<form name="f1">
<label>this is my label</label>
<input />
<label>this is my other label</label>
<input />
</form>
<form name="f2">
<label>this is my label</label>
<input />
<label>this is my other label</label>
<input />
</form>
then you could do something like this
$('form label').live('click',function(){
$(this).next('input').focus();
});
you will need to use live or delegate since you're cloning the forms on the fly i'm assuming.
The simplest solution is to move the <input> tags inside the <label> tags and forgo the for attribute altogether. Per the HTML spec, <input> tags without for attributes are implicitly associated with their contents.
Try this:
<form>
<label>First Name: <input type='text' name='FirstName' /></label><br/>
<label>Last Name: <input type='text' name='LastName' /></label><br/>
</form>
(See: http://www.w3.org/TR/html401/interact/forms.html#h-17.9.1)
You shouldn't have multiple identical ids in the page. It defeats the purpose of the id attribute and is against the W3C spec.
Regardless, jQuery's $(this) could help you in this situation. Say you gave all your the "focusable" class. Then you could do:
$('.focusable').focus( function(){
$(this).doSomething();
});
This is really an HTML question. A label can be associated wtih a form control either by its for attribute having the same value as the associated control's id attribute, or by having the control as a child of the label, e.g.
<form ...>
<label for="nameField">Name:<input id="nameField" name="nameField" ... ></label>
<label>email:<input name="emailField" ... ></label>
</form>
I suppose in jQuery you need something like:
var labelAndInput = $('<label>text<input ... ></label>');
or whatever. Note that older versions of IE (and maybe more recent ones too) the label will not be associated with the control without the for attribute (or htmlFor property), there is no other way.

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