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How to run form action and click event simultaneously on button click

I am having a form like this
<form name="test" action="action.php" method="get">
<input type="text" />
<input type="button" value="download"/></form>
I need a click event for download button. Eg. If i click download it should submit as action.php and run $('#button').click(function(){ also. How can I do it.

Perform the operation on 'download' button click then trigger the form submit using trigger
$('.download').click(function(e){
alert('downloading!') //Your Download Logic HERE
$(this).parent().trigger('submit')//Trigger Form SUBMIT ONCE THE OPERATION IS DONE
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form name="test" action="action.php" method="get">
<input type="text" />
<input type="button" value="download" class="download"></form>

Firstly note that <form> elements are not self closing, so your current HTML is invalid; the input elements need to be within the form itself.
Once that is fixed you can trigger() a submit event on the parent form to the #button element, like this:
$('#button').click(function() {
console.log('Custom logic here...');
$(this).closest('form').trigger('submit');
});
$('form').on('submit', function(e) {
e.preventDefault();
console.log('Submitting form...');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form name="test" action="action.php" method="get">
<input type="text" />
<input type="submit" value="search" />
<input type="button" value="download" id="button" />
</form>

You can simply submit your form by javascript, after clicking download button:
$('#button').click(function(){
...
document.forms["myform"].submit();

Auto Submit When Character reaches a Particular Number in a form isn't Working

This Code Works but when i copy and paste into it, it doesn't submit.
<script src="jquery-3.2.1.min.js"></script>
<form id="Form" action="pro_add_invoice.cfm" method="post">
<input id="here"name="htno" type="text" value="" />
<input id="subHere" type="submit" value="Submit" />
</form>
<script>
$('#here').keyup(function(){
if(this.value.length ==10){
$('#Form').submit();
}
});
</script>

I'm assuming you just want to submit the form after ten characters are entered. You can use $().submit() instead and pass in the id of the form.
<form id="Form" action="sell.cfm" method="post">
<input id="here"name="htno" type="text" value="" />
<input id="subHere" type="submit" value="Submit" />
</form>
<script>
//$('#here').keyup(function(){
// if(this.value.length ==10){
// $('#Form').submit();
// }
//});
var input = document.querySelector('#here');
input.addEventListener('keyup', checkLength);
function checkLength(e){
if(e.target.value.length===10){
document.forms["Form"].submit();
}
}
</script>

If you want to submit the form you cannot use click event handler. That's only for click events. you need to call the submit method of the form element to submit the form.
Change your If statement to execute the following:
Vanilla JS:
document.forms.Form.submit();
or
JQuery:
$('#Form').submit();
SO...
<script>
$('#here').keyup(function(){
if(this.value.length ==10){
$('#Form').submit();
}
});
</script>

I think the problem here is this context is not belong to #here, the scope in the anonymous function (probably) belong to window.
I didn't try it yet but maybe this solve the problem, try change this to ('#here')

javascript function call for single form

I have multiple forms in my php file for different buttons. So, if I click on Back button, ramesh.php script should be called and so on. This is the code.
<form action="ramesh.php">
<input type="submit" value="Back" />
</form>
<form action="process.php" method="post">
<input name="rep_skyline" type="text" />
<input type="submit" />
</form>
<form action="update.php" method="post" >
<button type="submit">Update</button>
</form>
However, I need to pass some data to server from my client side on form submit just for the update button. I have a javascript function to send the data to server side as below.
<script type="text/javascript">
$(document).ready(function() {
$('form').submit(function(e) {
var mydata = 3;
if ($(this).is(':not([data-submit="true"])'))
{
$('form').append('<input type="hidden" name="foo" value="'+mydata+'">');
$('form').data('submit', 'true').submit();
e.preventDefault();
return false;
}
})
})
</script>
If I click on the update button, the javascript function is working fine. However, if I click on Back or Submit button, I should not be calling the javascript function. Is there someway to do this?

Give your form an id:
<form action="update.php" method="post" id="update-form">
Then use a more specific selector:
$("#update-form").submit(function() {
// Code
});
I'm not quite sure why you need JavaScript to dynamically add data to your form, however. You should just use an <input type="hidden" /> directly.

type=submit will always load the form's action. Try to specify wich form to submit.
<form name="backForm" id="backForm" action="ramesh.php">
<input type="submit" value="Back" />
</form>
<form name="form2" id="form2" action="process.php" method="post">
<input name="rep_skyline" type="text" />
<input type="submit" />
</form>
Now you can access the form via document.backForm or document.getElementById("backForm") and than use submit(); like document.getElementById("backForm").submit();

How to re-enable disabled form fields after submitting form?

I'm able to disable blank form fields, on submission, with:
<form method="GET" onsubmit="onsubmit1(this)">
...
<script type="text/javascript">
function onsubmit1(thiz) {
$(thiz).find(':input').each(
function() {
if (!$(this).val()) {
$(this).attr('disabled', true)
}
}
)
}
The problem is that the fields remain disabled, when the user selects to export a .CSV file, as the page doesn't refresh after the .CSV file is downloaded to the browser.
I would like the disabled input fields to be re-enabled, when the user selects to export a file.
Bonus points for solving this via the form's onsubmit handler, and not via the submit button's onclick handler as there are many submit buttons.

I have made demo please refer this Demo
See Demo
<input type="text" />
<input type="text" />
<input type="text" />
<input type="text" />
<input type="submit" value="Enabled" id="btn2">
<input type="submit" value="Disabled" id="btn1">
$('#btn1').on("click", function () {
alert($(this).val());
$('input:text').attr('disabled', true);
});
$('#btn2').on("click", function () {
alert($(this).val());
$('input:text').attr('disabled', false);
});

can I click one button and use the action of another?

I have two buttons, and I want to apply one action to another. For example.
<form>
<input type="submit" />
</form>
<input type="submit" />
I want to make the second button submit the form, despite being outside of the form.

You should make them of type button, and give your form an id.
Markup:
<form id="myForm">
<---STUFF---->
<input type='button' id='otherButton'>
</form>
<input type='button' id='someButton'>
jQuery:
$('#someButton').click(function() { $('#myForm').submit(); });

$(':input:last').click(function()
{
$('form').submit();
});

// enable form submit on the second <input>
$('input[type=submit]').click(function(){
$('form').submit();
});
// disable the inner <input>
$('form input[type=submit]').click(function(){
return false;
});
Something like this should do your trick.

If you want the second button to do everything the first can do (not just submit), you can try something like this:
html
<form>
<input id="insideButton" type="submit" />
</form>
<input id="outsideButton" type="submit" />
jsJQUERY
$("#outsideButton").click(function() {
$("#insideButton").trigger("click");
});

you can using jQuery $("#test").click() if you have jQuery instead of the document... stuff below or the way below will work without jQuery
<form name="testForm1">
<input type="submit" id="test" />
</form>
<!-- use this when not in a form: -->
<button onclick="button1_click();" id="button1"></button>
In your head tag
<script type="text/javascript">
function button1_click(){
document.forms.testForm1.submit();
}
</script>
Changed for the users that put performance under clean code