Develop Reference

Send form with both triggers for action and onclick

I need to connect one button to 2 activities, in this case the form argument "action" and button argument "onclick" inside a form.
The forms "action" is PHP-based class and the button's "onclick" is connected to a javascript.
Environment:
The question is generic but to clarify I will use the form in later stage in a Laravel 8 environment. This means that the handling of form "action" is being taken care of by Laravel through a route. The onclick should be triggered and the javascript is physically positioned at the end of the Laravel blade view.
The problem:
I noticed that having the button inside the form, runs the form "action", but prevents the button argument "onclick" to trigger the javascript. If put the mentioned button outside of form, then one can trigger the form, and the button outside the form but ends up with need of 2 buttons which break simplifying the user flow.
Question:
How can I trigger both form "action" and the javascript function from one button? Note! It is not needed that javascript is being trigger by "onclick" if there are other ways to trigger the javascript.
Test-1: Basic form
<form
method="post"
action="/payment-checkout"
>
<button type="button" name="button" onclick="initCheckout()">Send</button>
</form>
Result test-1:
forms action is being executed, but not javascript.
Test-2: Attempt to solve problem using form attribute "onsubmit":
<form
id="myForm"
method="post"
action="/payment-checkout"
onsubmit="submitFormFromJavascriptFunction()"
>
<input type="submit" name="" value="Submit">
</form>
function submitFormFromJavascriptFunction() {
// Execute this...
}
document.getElementById("myForm").onsubmit = function() {submitFormFromJavascriptFunction()};
Result test-2:
forms action is being executed, but not javascript.

Try to trigger sumbit event on a button click manually by using
document.getElementById("myForm").submit();
from your onclick function
Example
function submitform() {
console.log('Inside the onclick function');
document.getElementById("myForm").submit();
}
<form action="/action_page.php" id="myForm">
<label for="fname">First name:</label><br>
<input type="text" id="fname" name="fname" value="John"><br>
<label for="lname">Last name:</label><br>
<input type="text" id="lname" name="lname" value="Doe"><br><br>
<button type="button" onclick="submitform()">Submit</button>
</form>
<p>If you click the "Submit" button, the form-data will be sent to a page called "/action_page.php".</p>

Below is an example of doing a conventional html form submit with javascript execution on submit of the form.
The form gets submitted based on the return value of the javascript function.
Javascript function is attached to onsubmit event of the form.
button is a normal submit button with no event handler attached to itself.
//this function getts called on submission of the form via submit button.
//Its return value dictates whether form will be submitted or not
function checkQuery(){
var query = document.getElementById('myQuery');
if(query.value==""){
alert("Please enter your search query")
return false; //form will not submit
}
return true;//form will get submitted and laravel will see that submit button was pressed
}
<form
method="get"
action="https://stackoverflow.com/search" onsubmit="return checkQuery();"
>
<input type="text" id="myQuery" name="q" placeholder="your search query here">
<button type="submit" name="button">Search Now</button>
</form>
Your Test 2 should be like this:
<form
id="myForm"
method="post"
action="/payment-checkout"
onsubmit="return submitFormFromJavascriptFunction()"
>
<input type="submit" name="" value="Submit">
</form>
function submitFormFromJavascriptFunction() {
console.log("submitFormFromJavascriptFunction is getting called");
return true // or false based on your logic
}
// no need for below line
//document.getElementById("myForm").onsubmit = function() //{submitFormFromJavascriptFunction()};

Javascript onfocus and enter key

I have a login form which contains a username field, password field, and a submit button like so:
<form id="myform" name="myform" method="post" action="servlet/url">
<label>Username:</label>
<input type="text" name="username" value="user_name" placeholder="Username">
<label>Password:</label>
<input type="text" name="user_pwd" value="" placeholder="Password" onfocus="javascript:this.value=''">
<input type="submit" value="Submit">
</form>
If I click the submit button, it works as expected. However, pressing the enter key clears the password value UNLESS I click out of the password field first. I know that this is because of my onfocus attribute, however I would still like the password field to clear away automatically if you click back into it. What could be the cause of the enter key clearing the field?

You could replace onfocus= with onclick=. The functionality is somewhat different however.
I should also note that I cannot reproduce your experience in Chrome, Firefox, IE, nor Edge.

form is submit but values are not passing

When I submit form by using below function it is submitting but values are not passed through this function. I use all functions but nothing found:
document.getElementById("postad").submit();
Form is given below.
<form action="register.php" id="postad" method="post">
<input class="textfield2" type="text" id="post_title" style="width:640px;" placeholder="Ad Title" onBlur="check('post_title')" />
<input class="button" type="button" name="save" value="Publish" onclick="send();" />
</form>

Your form contains two form controls. Neither will be a successful control (i.e. one that appears in the submitted data), but for different reasons.
Only form controls with name attributes can be successful. Your text input doesn't have a name. (It also doesn't have a default value, so you need to type in it first).
Buttons can only be successful if they are the submit button used to submit the form. Your button isn't a submit button and you use JavaScript to submit the form.

There is no name attribute in your input text fields
<input name="post_title" class="textfield2" type="text" id="post_title" style="width:640px;" placeholder="Ad Title" onBlur="check('post_title')" />
.........^

Submitting form using button on enter

I have an html form that I want to only submit from a button located outside my form. I am using javascript to perform some verification and do not want the form to submit unless my javascript functions succeed. I found that if I have the button inside the form it will always submit regardless of the javascript, but if I have it outside the form when a user presses enter it simply submits the form. How can I force enter to perform the button javascript instead of submitting?
<form name="form1" action=<?$_SERVER["PHP_SELF"].'?'.$_SERVER["QUERY_STRING"]?> method="post">
<input type="text" maxlength="5" size="5" name="frmZip" value="">
<input type="hidden" name="frmLat" value="200">
<input type="hidden" name="frmLng" value="200">
<input type="submit" disabled="disabled" style="display:none" />
</form>
<button type="button" id="GetCoordinates" onclick="doClick();">Find Stores</button>
EDIT:
Found my solution.
I changed from
</form>
<button type="button" id="GetCoordinates" onclick="doClick();">Find Stores</button>
to
<input type="button" name="frmSubmit" onclick="doClick();" value="Submit">
</form>
This prevented the button from submitting the form so I submitted it in my doClick() via javascript.
EDIT 2:
While this seemed to work for a time, it has stopped catching the enter keystroke. I updated my button to:
<input type="submit" name="frmSubmit" onclick="return doClick();" value="Find Stores">
And always returned false in doClick(). This allowed me to submit the form via javascript once everything had executed.

While this doesn't answer your direct question, you can actually keep the button and simply use your validation on the form submit:
<form onsubmit="return validateForm()">
Then, in your validateForm method, return true or false indicating whether or not the validation has passed.
However to answer your direct question, you can also use the same approach on the submit button which will prevent the form from being submitted.
Update
As pointed out in the comments, an unontrusive solution is often desirable so here's that:
document.getElementById('theForm').onsubmit = function() { return validateForm(); };

Your button inside the form will not submit the form on enter if you add preventDefault...
$("form").submit(function(e) {e.preventDefault();});

html button v.s. html submit?

I have an input text box and a search submit button, and when user clicks the Search submit button, I want to redirect user to url http://testsearch/results.aspx?k=<value of text box k>, for example, if user put "StackOverflow" into text box and then clicks the search button, I want to redirect user to the following page,
http://testsearch/results.aspx?k=StackOverflow
I find when I use button for Search button, it works (see below source codes),
<input type="text" id="k" name="k" />
<input type="button" id="Go" value="Search" onclick="location.href = 'http://somemachine/Search/results.aspx?k='+document.getElementById('k').value;"/>
but when I use submit for Search button, it does not works (see below source codes), why?
<input type="text" id="k" name="k" />
<input type="submit" id="Go" value="Search" onclick="location.href = 'http://somemachine/Search/results.aspx?k='+document.getElementById('k').value;"/>
thanks in advance,
George

You can even use the submit button this way:
<input type="submit" id="Go" value="Search" onclick="document.location='http://testsearch/results.aspx?k=StackOverflow'; return false;" />
Semantically submit button is used to submit forms not redirect pages. You should use normal button type for this. However as i showed you can use the submit button too but that is not semantic i think.
The below line prevents the form from being submitted.
return false;
That is what you are missing in your code :)
Thanks

<button>-elements and <input type="button"/> don't do anything by default, unless you tell them to do something with Javascript.
<input type="submit"/> will submit the form it is in.
So, if <input type="submit"/> won't work, you got it probably not in the <form/>-element itself.

If that's the only field in your form, simply set the form's method to "get" and it'll work.
<html>
<body>
<form action="http://localhost/mytest" method="get" >
<input type="text" id="k" name="k" />
<input type="submit" id="Go" value="Search" />
</form>
</body>
</html>

<button> means "put a button in the page and do whatever the onclick event says". So if you don't write an onclick handler the page doesn't do nothing.
If you use submit is ok, because you want to redirect to another page.
If you want to use button anyway you can do this way:
<script>
function doTheSearch() {
// do the submit mannually
document.getElementById('myForm').submit();
}
</script>
<form id="myForm" action="results.aspx">
<input type="text" id="k" name="k" />
<input type="button" id="Go" value="Search" onclick="doTheSearch();" />
</form>
Warning: submit button with onclick
If you have a submit button (inside a form, it is, a working submit button) with an onclick event, some browsers will:
1) execute onclick
2) execute submit
your onclick tries to redirect but the submit button wins.
If you want to avoid it you have some options:
a) change submit button to normal button
b) avoid the submit thing (add onsubmit="return false;" to form element)
c) use the submit procedure (form action="..." method="get", no onclick event), the browser will be happy and you can control the submit in the onsubmit event (you can cancel it or not).

make sure you got the input's in a form tag with a GET method:
<form action='http://testsearch/results.aspx' method='GET'>
... inputs
</form>

If I'm understanding correctly, it is not working because it is not in a form tag. If you put it in a form tag with method="get" it should work. The button works because it does not have to be in a form.