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Your statement has an extra tick mark... is that in the code? Breaking it up for readability, it looks like this: 
 
onsubmit=&quot; 
return confirm( 
'Are you sure you want to change the dates on this reservation to ' + 
document.getElementByID('datepicker3').value + 
' to ' + 
document.getElementById('datepicker4').value' 
); 
&quot; 
 
See the extra tick mark at the end of the bolded part?
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I have an onsubmit process that looks like 
 
&lt;form onsubmit=&quot;return confirm('Are you sure you want to change the dates on this reservation to those new dates?');&quot; 
 
What I'd like to do is change that string to incorporate some text from some form fields in the document. 
 
I tried 
 
onsubmit=&quot;return confirm('Are you sure you want to change the dates on this reservation to '+document.getElementByID('datepicker3').value+' to '+document.getElementById('datepicker4').value');&quot; 
 
but alas - it didn't work nor have any of the other variations kinda similar to that. 
 
What am I missing? &nbsp; 
 
Thanks in advance!
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I have an onsubmit process that looks like

<form onsubmit="return confirm('Are you sure you want to change the dates on this reservation to those new dates?');"

What I'd like to do is change that string to incorporate some text from some form fields in the document.

I tried

onsubmit="return confirm('Are you sure you want to change the dates on this reservation to '+document.getElementByID('datepicker3').value+' to '+document.getElementById('datepicker4').value');"

but alas - it didn't work nor have any of the other variations kinda similar to that.

What am I missing? 

Thanks in advance!

Javascript onsubmit script / string

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.