Laurie Harper wrote:
Catherine wrote:
3. <html:button property="submitAction" value="Add Property"
onclick="javascript:checkProp()">
This is my real problem. I have a single selection dropdown menu
which contains the allowed properties of the object. When user selects
a property and clicks the Add Property button, I call checkProp() to
check if it already added to the object. If yes, I alert user and
don't submit form; if no, I call form.submit(). I found that
submitAction="" if the form is submitted this way. I tried to do
form.submitAction.value = "Add Property" before submit(), but that
didn't help. How can I pass that value?
If you define an onclick event handler then, as far as I understand it,
clicking the button will execute the event handler first and then submit
the form second *if* the event handler returns true. So, if your
checkProp() function returns true the form would be submitted as if you
hadn't had an onclick handler; if it returns false, the form will not be
submitted.
Almost :)
Note that an <input type="button"> (html:button> is different from an
<input type="submit"> (html:submit). The button won't submit the form
at all unless you write script to call form.submit(), it's just a button
with no inherent functionality, as far as for form goes.
What you'd want to do is hook the onSubmit event of an actual submit
button. There, you can call your validation code and as you say, return
true to allow the form submission to go through, false to abort it.
I *think* the problem you are seeing Catherine, and I'm saying this from
memory so I may not have it quite right, is that button values aren't
submitted with the form unless it was an actual submit button. So, you
would have to have a hidden form field named submitAction that you
populate via script if the form isn't being submitted with an actual
submit button.
For case 2, you're specifying the URL to load in the Javascript so
you're not submitting the form. Therefore your form properties aren't
included in the request. I'm not sure how you get the onclick handler to
submit the form as if the handler weren't there, my Javascript fu isn't
that good yet ;-)
That's correct, in case 2 the form isn't being submitted, so no
parameters are sent. Basically, there is two mechanisms by which the
form can get submitted: (a) the user clicks a submit button, or (b) some
script calls submit() on the form. In the case of (a), you can hook the
onsubmit event and call some function, and as Laurie said, return true
to allow the form to be submitted, or false to stop it. In the case of
(b), you hook the onclick event of a plain old button and you take on
complete responsibility for submitting the form, it will never happen
automatically in that case. In both cases it might be easier to have
some script set a hidden field with the appropriate submitAction value,
that way you have complete control over it.
L.
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Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
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