Pass form values to another function without submitting - javascript

My goal is:
I have an /edit action in my Yii project containing some form with fields let's say:text, image.
There are some values entered to these forms (let's say 'my text' and 'my image').
I have a button Save (we don't use it) and a button which directs me to action /preview, and I need to pass there an array like ['text' => 'my text', 'image' => 'my image'] or the same as an object.
Can I even do this without submitting the form? I thought about javascript, but is there some way to avoid using it?

Unfortunately for you, using Javascript ( jQuery + AJAX ) is the way to do it, and I don't think there is another way.

You can submit the form to either /edit or /preview, depending on which button is clicked.
It's a pity you didn't take the time to show your form code. However, assuming your form looks like
<form method="post" id="myform">
<input type="submit" data-url="/edit" value="Edit" />
<input type="submit" data-url="/preview" value="Preview" />
...
</form>
You can submit the form to one or the other.
$(document).ready(function(){
$("#my_form").submit(function( event )
var url = $(this).attr('data-url');
$('#my_form').attr('action',url);
:
});
});

Related

submitting a form with link

I have following form structure
<form action="{Basket-Addproduct}" method="post" id="items-form">
<button class="button-text button-gray-custom" type="submit" value="Submit" name="{dynamically generated name}"><span>Submit</span></button>
</form>
here "dynamically generated name" is the key field which tells which element or product to submit..
I want it to convert it into link,
I have tried following
Add This
Its getting submitted but not able to add the product...
Its expecting the name parameter also to be passed so it knows which product to add...
Stuck....:(
Any solution appreciated...
you should have <input type="submit".
There is no need to do JavaScript.
Just remove JS and then have as many <input type="submit" buttons as you want.
The GET/POST should have the key/value you look for.
E.g.
<input type="submit" name="item1" value="submit" />
when you click it, the recipient receives (sorry PHP used here):
$_GET['item1'] = submit
and other submits do not have value.
You can use jQuery to do this clean and easy.
So, here's your link:
<a id="form-submit-btn" href="#" name="{dynamically generated name}">Add This</a>
And your form:
<form action="{Basket-Addproduct}" method="post" id="items-form">
<!-- form contents -->
</form>
Now write a JavaScript which submits your form data on a button click:
$('#form-submit-btn').click(function(e) {
e.preventDefault();
var $form = $('#items-form');
$.post($form.attr('action'), $form.serialize(), function(data){
// do something with the data
});
});
Your code should work, I have created an example for you to test, here it is: http://jsfiddle.net/afzaal_ahmad_zeeshan/yFWzE/
<form id="form">
<input type="text" name="something" id="something" />
</form>
Submit
By using this you will submit the form using the id of it. And other user told you to use jQuery, which I am afraid you don't want to. In jQuery you use .preventDefault but if you want to stick to the simple JS then you will be using href="#" which will automatically prevent any anchor tag execution.
And the result of the request can be checked, which sadly is an error. But it makes sure that the request has been sent to the server.
Then you can test the methods and other type of executions by having some if else blocks as
if(condition == true) {
// if post
} else {
// if get
}
The parameter might be mis handled on the server side, because when the form is submitted you need to take out the data from the QueryString (the request is GET). So, you need to check that, or if that's not the issue then make sure you're pointing the element well. Otherwise if there is no such element, nothing will be sent.
I am not sure, which language you're using but here is the code for ASP.NET
var value = Request.QueryString["something"];
PHP version is already present above. That all depends on the parameters you send with the request. You are more likely to convert the code to a function. Such as
Submit
And the function
function submit() {
// create variable
var value = document.getElementById("something").value;\
// now submit the form and all that other bla bla, which
// you want to be process,
}
If you find this one tricky, using jQuery as
var values = $('form').serialize();
will be easy. This will create a string of the form and will send it with the request.

PHP - Submit HTML form with missing name attribute

I have the following HTML form (including JavaScript) from an external website that I'm trying to automate login for.
<form name="autologin" method="POST" action="https://post.website.com"></form>
<script language="JavaScript">
document.autologin.submit();
</script>
with inputs
<input type="hidden" name="Z" value="0,0">
<input style="font-size: 11px;" type="submit" value="Logon">
How do I submit this form programmatically using PHP, if it the second input has a missing name?
My code so far:
$url = 'https://post.website.com';
$request = new HTTP_REQUEST2($url, HTTP_REQUEST2::METHOD_POST);
$mainPageRequest = array(
'Z' => '0,0',
'' => 'Logon' // <---- What goes here since it's missing a name?
);
$request->addPostParameter($mainPageRequest);
$request->send();
Inputs without names are not submitted at all. If submitting a form in the normal way (by clicking the button), only those inputs that have names will be transferred; the others are simply ignored.
You can test for yourself by putting some inputs, with and without names in a form and using method="get", so that the submitted data ends up visually in the location bar.
So the answer to the question "What goes here since it's missing a name?" is: nothing.
$mainPageRequest = array(
'Z' => '0,0'
);

How to update/change HTML content with JavaScript and prevent the page from refreshing?

I'm a newbie to scripting. I want to update HTML content with JavaScript, but as you can see
the web page keeps refreshing.
How can I prevent the page from refreshing?
Javascript:
function showResult(form) {
var coba=form.willbeshown.value;
var coba2=coba+2;
document.getElementById("showresulthere").innerHTML=coba2;
}
HTML
<form>
<input type="text" name="willbeshown" value="">
<button onclick="showResult(this.form)">Ganti1</button>
</form>
<p id="showresulthere">Result will be shown here</p>
</body>
Don’t use a form at all. You are not submitting any form data to a server. To process data in the browser, you don’t need a form. Using a form just complicates things (though such issues could be fixed by using type=button in the button element, to prevent it from acting as a submit button).
<input type="text" id="willbeshown" value="">
<button onclick=
"showResult(document.getElementById('willbeshown'))">Ganti1</button>
<p id="showresulthere">Result will be shown here</p>
<script>
function showResult(elem) {
document.getElementById("showresulthere").innerHTML = Number(elem.value) + 2;
}
</script>
I have used conversion to numeric, Number(), as I suppose you want to add 2 to the field value numerically, e.g. 42 + 2 making 44 and not as a string, 42 + 2 making 422 (which is what happens by default if you just use an input element’s value and add something to it.
Your button should be
<button onclick="showResult(this.form); return false;">Ganti1</button>
Javascript
function showResult(form) {
var coba=form.willbeshown.value;
var coba2=coba+2;
document.getElementById("showresulthere").innerHTML=coba2;
return false; // prevent form submission with page load
}
DEMO
The others will explain how you should use jQuery, but this would explain why it didn't work in your original code.
The <button> tag submits the form, so you have to add this inside your form tag to prevent form submission:
<form onsubmit="return false">
Btw, even without giving your form an explicit action, it uses the current page to submit; it's easy to think that it will not do anything without an action.
If you define a <button /> without defining its type it will work like a submit button. Just add type="button" to your button markup and the form won't be submitted.
<button type="button" onclick="showResult(this.form)">Ganti1</button>
With this change you won't need any return false or .preventDefault() "workarounds"

How send a form with Javascript when input name is "submit"?

Question: How can you send a form with Javascript if one form input has the name submit?
Background: I am redirecting the user to another page with a hidden HTML form. I cannot change name on the (hidden) inputs, since the other page is on another server and the inputs need to be exactly as they are. My HTML form looks like this:
<form id="redirectForm" method="post" action="http://www.example.com/">
<input name="search" type="hidden" value="search for this" />
<input name="submit" type="hidden" value="search now" />
</form>
I use the following javascript line to send the form automatically today:
document.getElementById('redirectForm').submit();
However, since the name of one input is "submit" (it cannot be something else, or the other server won't handle the request), document.getElementById('redirectForm').submit refers to the input as it overrides the form function submit().
The error message in Firefox is: Error: document.getElementById("requestform").submit is not a function. Similar error message in Safari.
Worth noting: It's often a lot easier to just change the input name to something other than "submit". Please use the solution below only if that's really not possible.
You need to get the submit function from a different form:
document.createElement('form').submit.call(document.getElementById('redirectForm'));
If you have already another <form> tag, you can use it instead of creating another one.
Use submit() method from HTMLFormElement.prototype:
HTMLFormElement.prototype.submit.call(document.getElementById('redirectForm'));

Form not submitting with JS

I have the worlds most simple javascript function:
fnSubmit()
{
window.print();
document.formname.submit();
}
Which is called by:
<button type="button" id="submit" onclick="fnSubmit()">Submit</button>
All is well and good, the print dialog shows up, however after printing or canceling the print I get the following error:
"document.formname.submit is not a function"
My form is defined as follows: (obviously I am not using formname in the actual code but you get the idea)
<form name="formname" id="formname" method="post" action="<?=$_SERVER['SCRIPT_NAME']?>">
Obviously I am not trying to do anything special here and I have used similar approaches in the past, what in the world am I missing here?
In short: change the id of your submit button to something different than "submit". Also, don't set the name to this value either.
Now, some deeper insight. The general case is that document.formname.submit is a method that, when called, will submit the form. However, in your example, document.formname.submit is not a method anymore, but the DOM node representing the button.
This happens because elements of a form are available as attributes of its DOM node, via their name and id attributes. This wording is a bit confusing, so here comes an example:
<form name="example" id="example" action="/">
<input type="text" name="exampleField" />
<button type="button" name="submit" onclick="document.example.submit(); return false;">Submit</button>
</form>
On this example, document.forms.example.exampleField is a DOM node representing the field with name "exampleField". You can use JS to access its properties such as its value: document.forms.example.exampleField.value.
However, on this example there is an element of the form called "submit", and this is the submit button, which can be accessed with document.forms.example.submit. This overwrites the previous value, which was the function that allows you to submit the form.
EDIT:
If renaming the field isn't good for you, there is another solution. Shortly before writing this, I left the question on the site and got a response in the form of a neat JavaScript hack:
function hack() {
var form = document.createElement("form");
var myForm = document.example;
form.submit.apply(myForm);
}
See How to reliably submit an HTML form with JavaScript? for complete details
Given that your form has both an id and a name defined, you could use either one of these:
With the form tag's id:
document.getElementById('formname').submit();
With the form tag's name attribute:
document.forms['formname'].submit();
Try this:
fnSubmit()
{
window.print();
document.getElementById("formname").submit();
}
The most likely culprit is IE confusing JavaScript variables, ids, and names. Search in your source for something sharing the name of your form.
Place a input button inside your form.
Give tabindex="-1" on it.
Make It invisible using style="display:none;".
Like This
<input type="submit" tabindex="-1" style="display:none;" />

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