Change the value of hidden field and submit on button click

I would like to change the value of issendnow when this button is clicked

<button type="button" class="btn btn-warning" onclick="(makerecurring);">[code]

submitting this form: 

[code]<form class="smart-form" id="group-form" name="group-form" action="#event.buildLink('MassEmail.SendMassMessage')#" method="post"  enctype="multipart/form-data">
<input type="hidden" name="issendnow" id="issendnow" value="1" />

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tryportAsked:
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Hans LangerCommented:
First you need to put the object (or input) into a variable, you can get it using the this:

var myInput= document.getElementById('issendnow')

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and them you can modify its properties, like its value, with this:

myInput.value = 2 

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so, your button,in one line, will be something like:

<button type="button" class="btn btn-warning" onclick="document.getElementById('issendnow').value = 2">

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tryportAuthor Commented:
Thanks for your response. Are you saying put the first two lines within a script tag? Or that I wouldn't even ultimately need the first two lines if I used the button line?
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Aurelian ConstantinProgrammer-analystCommented:
As GERENTE said, just replace your (makerecurring); in onClick event of button with document.getElementById('issendnow').value=2; but also add document.group-form.submit();

So, the working code is (pay attention to the onClick code):

<button type="button" class="btn btn-warning" onclick="document.getElementById('issendnow').value=2;document.group-form.submit();">

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which makes that the value of hidden input issendnow to be changed to 2, and the form to be submitted when you press the button.

I hope it helps.
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Hans LangerCommented:
The first 2 lines were only to explain you how it works. If you put it "inline" you do not need to create those 2 lines.
So, in general, if you want  a javascript code be executed you need to put it inside SCRIPT tags or inside an HTML in an event attribute, like "onclick", that will be executed when the user click the object.
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tryportAuthor Commented:
Thanks to you both. The problem is it seems to bypass any onsubmit validation I have when it is submitted onclick this way. ?
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Hans LangerCommented:
When you use a submit button, when you click on it, it will submit the closest form and trigger the event "onSubmit" of the form. Any other event will not be trigger unless you specify it manually. Like you did on the button event "onClick".
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