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How to click on button by onclick method?

I am use puppeteer for get data from page. But all button on webpage have same type and class - only difference is onclick attribute. I need click on different button to open tray with information I need.
For example:
> <button type="button" class="btn btn-primary"
> onclick="OpenTray(10002)">More</button>
> <button type="button" class="btn btn-primary"
> onclick="OpenTray(10003)">More</button>
> <button type="button" class="btn btn-primary"
> onclick="OpenTray(10004)">More</button>
So how I can tell puppeteer only click on button with onclick attribute for example OpenTray(10002)

You should be able to achieve this with a slightly more complex selector:
const button = await page.waitForSelector(`button[onclick="OpenTray(10004)"]`)
There are a lot of attribute selectors you can use to match the values of the attributes e.g. contains, starts with, ends with.

JavaScript script only working on the first element it detects? [duplicate]

I have 3 buttons with same ID. I need to get each button's value when it's being clicked.
<button id="xyz" type="button" class="btn btn-primary" value="1">XYZ1</button>
<button id="xyz" type="button" class="btn btn-primary" value="2">XYZ2</button>
<button id="xyz" type="button" class="btn btn-primary" value="3">XYZ3</button>
Here is my current jQuery script:
$("#xyz").click(function(){
var xyz = $(this).val();
alert(xyz);
});
But it works only for the first button, clicking on the other buttons are being ignored.

I have 3 buttons with same id ...
You have invalid HTML. You can't have more than one element in a page with the same id attribute value.
Quoting the spec:
7.5.2 Element identifiers: the id and class attributes
id = name [CS]
This attribute assigns a name to an element. This name must be unique in a document.
Solution: change from id to class:
<button type="button" class="btn btn-primary xyz" value="1">XYZ1</button>
<button type="button" class="btn btn-primary xyz" value="2">XYZ2</button>
<button type="button" class="btn btn-primary xyz" value="3">XYZ3</button>
And the jQuery code:
$(".xyz").click(function(){
alert(this.value);
// No need for jQuery :$(this).val() to get the value of the input.
});
But it works only for the first button
jQuery #id selector docs:
Each id value must be used only once within a document. If more than one element has been assigned the same ID, queries that use that ID will only select the first matched element in the DOM. This behavior should not be relied on, however; a document with more than one element using the same ID is invalid.
If you look at the jQuery source you can see when you call $ with an id selecor-($("#id")), jQuery calls the native javascript document.getElementById function:
// HANDLE: $("#id")
} else {
elem = document.getElementById( match[2] );
}
Though, in the spec of document.getElementById they didn't mention it must return the first value, this is how most of (maybe all?) the browsers implemented it.
DEMO

ID means "Identifier" and is valid only once per document. Since your HTML is wrong at this point, some browsers pick the first, some the last occuring element with that ID.
Change ids for names would be a good step.
Then use $('button[name="xyz"]').click(function(){

From my experience, if you use $('button#xyz') selector instead it will work. That's a hack, but it's still invalid HTML.

Although changing the id's to a class is better, you can get all the elements with the same id using the attribute equals selector:
$('[id="xyz"]')
Or this to get only buttons with id xyz:
$('button[id="xyz"]')
Or divs with id xyz:
$('div[id="xyz"]')
etc.
Alternatively you could use the "Attribute Contains Selector" to get all elements with ids that contain "xyz":
$('[id*="xyz"]')
Of course, this means all elements with id that partially contain "xyz" will get selected by this.

this also worked if you have multiple element with same id.
$("button#xyz").click(function(){
var xyz = $(this).val();
alert(xyz);
});
you can check HERE

If you have same id in a container you can use on() to access each element for every event
$("#containers").on("click","#xyz",function(){
alert($(this).val())
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="containers">
<button id="xyz" type="button" class="btn btn-primary" value="1">XYZ1</button>
<button id="xyz" type="button" class="btn btn-primary" value="2">XYZ2</button>
<button id="xyz" type="button" class="btn btn-primary" value="3">XYZ3</button>
</div>
and info about on() is here

You can't have the same id because id is unique in page HTML. Change it to class or other attribute name.
$('attributename').click(function(){ alert($(this).attr(attributename))});

Simulate click of javascript Button

How can i simulate a click of the button below? I tried using the javascript
$("#Save").click() but it didnt work. Does this have to do with it not working because there is no id but name?
<input class="button" type="submit" name="Save" value="Save" onclick="OnSubmit(this.form);">
What javascript command in my browser would i use to simulate the click of Save following something like i tried to use?
Much help appreciated! Im new to this

It appears your using jQuery with an id selector (# denotes an id), however the element doesn't have an id. Since the element does have a name attribute, an attribute selector can be used by jQuery. An appropriate selector would be:
$('input[name="Save"]').click(); //Assuming no other elements have name=Save
JS Fiddle: http://jsfiddle.net/pJD3R/
You could also change the markup to work with your existing selector by adding an id attribute:
<input id="Save" class="button" type="submit" name="Save" value="Save" onclick="OnSubmit(this.form);">

$("#Save").click() mean you target an element with the id save but you don't have any id on your input.
<input class="button" id="save" type="submit" name="Save" value="Save" onclick="OnSubmit(this.form);">

$('input[name=Save]').click(function(){
alert('Do Something');
});

jQuery ID selector works only for the first element

I have 3 buttons with same ID. I need to get each button's value when it's being clicked.
<button id="xyz" type="button" class="btn btn-primary" value="1">XYZ1</button>
<button id="xyz" type="button" class="btn btn-primary" value="2">XYZ2</button>
<button id="xyz" type="button" class="btn btn-primary" value="3">XYZ3</button>
Here is my current jQuery script:
$("#xyz").click(function(){
var xyz = $(this).val();
alert(xyz);
});
But it works only for the first button, clicking on the other buttons are being ignored.

I have 3 buttons with same id ...
You have invalid HTML. You can't have more than one element in a page with the same id attribute value.
Quoting the spec:
7.5.2 Element identifiers: the id and class attributes
id = name [CS]
This attribute assigns a name to an element. This name must be unique in a document.
Solution: change from id to class:
<button type="button" class="btn btn-primary xyz" value="1">XYZ1</button>
<button type="button" class="btn btn-primary xyz" value="2">XYZ2</button>
<button type="button" class="btn btn-primary xyz" value="3">XYZ3</button>
And the jQuery code:
$(".xyz").click(function(){
alert(this.value);
// No need for jQuery :$(this).val() to get the value of the input.
});
But it works only for the first button
jQuery #id selector docs:
Each id value must be used only once within a document. If more than one element has been assigned the same ID, queries that use that ID will only select the first matched element in the DOM. This behavior should not be relied on, however; a document with more than one element using the same ID is invalid.
If you look at the jQuery source you can see when you call $ with an id selecor-($("#id")), jQuery calls the native javascript document.getElementById function:
// HANDLE: $("#id")
} else {
elem = document.getElementById( match[2] );
}
Though, in the spec of document.getElementById they didn't mention it must return the first value, this is how most of (maybe all?) the browsers implemented it.
DEMO

ID means "Identifier" and is valid only once per document. Since your HTML is wrong at this point, some browsers pick the first, some the last occuring element with that ID.
Change ids for names would be a good step.
Then use $('button[name="xyz"]').click(function(){

From my experience, if you use $('button#xyz') selector instead it will work. That's a hack, but it's still invalid HTML.

Although changing the id's to a class is better, you can get all the elements with the same id using the attribute equals selector:
$('[id="xyz"]')
Or this to get only buttons with id xyz:
$('button[id="xyz"]')
Or divs with id xyz:
$('div[id="xyz"]')
etc.
Alternatively you could use the "Attribute Contains Selector" to get all elements with ids that contain "xyz":
$('[id*="xyz"]')
Of course, this means all elements with id that partially contain "xyz" will get selected by this.

this also worked if you have multiple element with same id.
$("button#xyz").click(function(){
var xyz = $(this).val();
alert(xyz);
});
you can check HERE

If you have same id in a container you can use on() to access each element for every event
$("#containers").on("click","#xyz",function(){
alert($(this).val())
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="containers">
<button id="xyz" type="button" class="btn btn-primary" value="1">XYZ1</button>
<button id="xyz" type="button" class="btn btn-primary" value="2">XYZ2</button>
<button id="xyz" type="button" class="btn btn-primary" value="3">XYZ3</button>
</div>
and info about on() is here

You can't have the same id because id is unique in page HTML. Change it to class or other attribute name.
$('attributename').click(function(){ alert($(this).attr(attributename))});

Click each button with the same ID

I have two buttons with the same ID:
<button type="submit" onclick="//do something" id="theID">button 1</button>
<button type="submit" onclick="//do something" id="theID">button 2</button>
I would like to click both the buttons using prototype. So far I've tried the following but it doesn't work.
$('theID').each(function(item) {
item.click();
});
How can I easily click both buttons using prototype?

I have two buttons with the same ID
There's the problem. Use classes instead of IDs; by design and definition IDs must be unique. Stuff just plain won't work if they aren't.
$('.clickable').each(function(item) {
item.click();
});
And
<button type="submit" class="clickable">button 1</button>
<button type="submit" class="clickable">button 2</button>

I would say that the same id is a bad idea in general. It is incorrect syntax, as an elements id must begin with a letter and can only be given to one element.
You cannot have two elements with the same id.