Is it guaranteed that a browser doesn't send an input element if it doesn't have the name attribute specified?
For example, can we assume that POSTing the form below won't send the credit card number?
<form action="/process" method="post">
<input id="credit-card-number" type="text">
<input type="submit" name="commit" value="Go">
</form>
Is it guaranteed that a browser doesn't send an input element if it doesn't have the name attribute specified?
Yes (unless you muck about with JavaScript to change that).
The specification is quite clear that controls without names cannot be successful.
A successful control must be defined within a FORM element and must have a control name.
The standard says that to send an input it should be a successful "control."
If a control doesn't have a name it's not a successful "control," so it should not be sent.
See http://www.w3.org/TR/html401/interact/forms.html
Related
Is there any way to validate inputs in the form using HMTL?
For example:
<input type="text" class="input-text error"
aria-required="true" placeholder="Enter your name *"
aria-invalid="true" required />
If user adds a special character to input, an error message saying "Characters are not allowed" should be shown below the input box.
First of all, client-side form validation is the greatest feature coming with the HTML5. Client-side form validation helps you to ensure data submitted matches the requirements. To get more detail about it you can visit here.
Important Note
Client-side form validation is an initial check, You should not use data coming from the form on the server side without checking it. It just a feature for good user experience. Because client-side validation is too easy to manipulate, so users can still easily send data that you do not want to on your server.
Solution
In this question, the best solution is; using HTML attribute pattern. The pattern attribute defines a regular expression the form control's value should match. To get more detail about pattern attribute you can visit the this page.
Below regexp you need.
^[a-zA-Z0-9]{5,12}$
It works like that;
It should contains only alphanumeric.
Minumum 5 and maximum 10
character.
You can use below code to integrate it with input field.
<form action="">
<input type="text" name="name" required
pattern="[a-zA-Z0-9]{5,12}" title="No special character">
<input type="submit">
</form>
Usually, to check inputs from html tags, you can create a javascript function to check your needs which is called everytime the user type in your input with the "onkeyup()" function.
The "onkeyup" keyword will trigger the function everytime user type in your field
<input type="text" onkeyup="myFunctionToCheck()">
<script>
myFunctionToCheck(){
//Here check your needs
}
</script>
So I have this form and I really want to use html5 validation. Problem is, there are two things my form needs to do:
Simply save the current state so it can be reloaded later (via jsp/servlets) (WITHOUT VALIDATING)
Actually submit the form (validate it before submitting)
Is there a way to turn off validation for a given button/submit but keep it for the other?
My workaround would be to use an AJAX call for the former and regular submit for the latter, but it kind of messes up the system I have in place.
You can add the "novalidate" attribute when the user clicks on a given button.
<form method="post" action="/foo" novalidate>...</form>
This disables html validation.
Add it again when you want your final submission.
EDIT
Apparently there's a better option, the formnovalidate attribute, that you can add to a specific field (which apparently is exactly what you want):
<form action="demo_form.asp">
E-mail: <input type="email" name="userid"><br>
<input type="submit" value="Submit"><br>
<input type="submit" formnovalidate="formnovalidate" value="Submit without validation">
</form>
Yes, by toggling the novalidate attribute (or the noValidate property on the HTMLFormElement object) with JavaScript.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/form#attr-novalidate
I have a button that is this <button id="btnSubmit">Submit</button> the problem is, I want the form tags to use this id so that is designed the way I want. And also this code, I have a few questions.
<form action="demo_form.php" method="get">
First name: <input type="text" name="fname"><br>
Last name: <input type="text" name="lname"><br>
<input type="submit" value="Submit">
</form>
what is the action="demo_form.php",input type="submit" do? And does the input type has any other "What do you call this stuff" besides submit?
The action="demo_form.php" sets the action, in this case, "navigate to file demo_form.php and send it the data".
<input type="submit" (...) > creates and element which submits the form e.g. executes the "action".
The method sets the way the data is submitted to the target of the action ("form_demo.php"), in this case get, which allows you to refer to the submitted data as $GET["name"] in PHP.
Possible input types are listed here.
You either give your <input type="submit" (...) > the id="btnSubmit" property or use javascript to submit the form after an event has been triggered.
MOr info on that is available here (i short: document.<get_the_form_element>.submit();).
I suggest you to take a look at this link. It describes all the basic concepts about how using forms. And you can also find a lot of information by Googling it.
The action attribute
The action attribute defines the action to be performed when the form is submitted.
The common way to submit a form to a server, is by using a submit button.
The input attribute
<input type="submit"> defines a button for submitting a form to a form-handler.
The form-handler is typically a server page with a script for processing input data.
If i understand your question correctly, these are my answers.
action
The action attribute describes the page to which the contents of the form are sent to. So if you have a sign up form with an input for an email, the text that is typed will be sent to the action path. It will be sent using the method described in the method attribute. So you can find your values in either the $_POST variable, or the $_GET variable, get is easy for being able to share the url and post is great for private information.
input
The input element is the actual way to input information (who guessed it). You've got an input of the type text for just text input, you've got checkbox for a true or false input and way way more see: w3schools
why don't you use
<input type="submit" value="Submit" id="btnSubmit">
Or if you want to use a button
<button id="btnSubmit">Submit</button>
Then from jquery or js you can submit the form.
And for this question,
what is the action="demo_form.php",input type="submit" do?
You should probably google it out. This is so basic.
Anyway, just a concise explanation:
action is the attribute where you will specify the code that will handle the form data submitted and input type="submit" will display a button in the page, clicking on it will submit the form.
There are a lot of types in input, the most common ones are
text
password
submit
I am using the the "GET" method in a form on my website. For some reason it is passing the value of the submit button to the url. Why is this happening? What am I doing wrong?
Form:
<form method="GET" action="searcht1.php">
<input type="text" name="search"/>
<input type="submit" name="submit">
</form>
Url:
searcht1.php?search=colin+pacelli&submit=Submit
It's supposed to happen. If you don't want that, do not define name attribute on the button. You probably want value instead, to show the user what the button is for.
Also, this question has nothing to do with PHP; it is purely about HTML semantics.
The reason is that the name attribute makes the submit button a “successful control” (in HTML 4.01 terminology) when it is used for form submission. This causes the name=value pair from it to be included in the form data.
Note that in your case, this data is name=foo where foo is the browser-dependent default value of the button. It could be submit, or it could be Lähetä kysely, or something exotic. You can, and normally should, use the value attribute to set this value, since it determines the text displayed in the button. It’s usually not desirable to have a submit button on your English-language appear with e.g. some text in Japanese just because a Japanese-language browser is being used.
So as others have written, the solution (if this is a problem) is to remove the name attribute. But since the value attribute should normally be used, you can make two changes simultaneously by just replacing the attribute name name by the name value, though you might also capitalize the word shown:
<input type="submit" value="Submit">
Try to remove name attribute from submit input
remove the name attribute of the button.....
I have a valid reason for wanting to do this, but it's a long story so I'll forgot trying to explain why and just ask if it's OK to do.
I have a page where I need to have multiple forms with the same name, but I only want the form whose submit button is click to be submitted. For example, the following might be on my page:
<form name="input" action="" method="get">
Username: <input type="text" name="user" />
<input type="submit" value="Submit" />
</form>
text
<form name="input" action="" method="get">
Username: <input type="text" name="user" />
<input type="submit" value="Submit" />
</form>
text
<form name="input" action="" method="get">
Username: <input type="text" name="user" />
<input type="submit" value="Submit" />
</form>
Is this acceptable?
Regarding the HTML 4.01 specication, you can use form elements with the same name attribute, as there is no uniqueness requirement on them. Doing so defeats the purpose of such attributes, though. They are meant for making it easier to refer to forms in client-side scripting: if you have <form name=foo>, then document.foo refers to that form.
It is undefined what happens when same name attribute is used, but what browsers seem to do is to return an array. In your example, document.foo would be a 3-element array, with document.foo[0] being the first form. But this is not useful, since (assuming there are no other forms in the document) you could use document.forms[0], with a well-defined meaning.
The name attribute itself is outdated for form elements (but not for form fields, where it keeps being essential). The HTML 4.01 spec clause on form says:
“name = cdata [CI]
This attribute names the element so that it may be referred to from style sheets or scripts. Note. This attribute has been included for backwards compatibility. Applications should use the id attribute to identify elements.”
In the HTML5 drafts, even the formal rules disallow the use of the same name attribute. The HTML5 clause on the name attribute on form says that its value “must be unique amongst the form elements in the forms collection that it is in, if any”. This is a confusing formulation, but it is safest to assume that it must be unique within the form elements of a document.
Yes it is allowed, only id's must be unique. I wouldn't recommend it however, why even put yourself in a position to be confused down the road.
The name attribute only defines what each form field element will be represented as when sent to the server.
It is also ok in HTML5. Only the name must be unique inside the form itself.
See the docs: "The value must not be the empty string, and the value must be unique amongst the form elements in the forms collection that it is in, if any."
When the user clicks a submit button, only that form will be taken in action. Still, it should be better to name them so that you are not confused :)