Hi, I'm very new to Prototype Javascript so any help would be greatly
appreciated.
My issue is this, I have a form that does calculations. At the bottom
of the form there is a button that when clicked updates the totals and
displays it at the bottom of the page. Here is the code for the
button.
<input type="button" name="update" id="update" value="Update Total"
onclick="footprintcalc.total(); footprintcalc.addElement();" />
This button actually does 2 things totals the numbers in the form like
I mentioned above but also adds a hidden input box that also holds the
totals. Here is the piece of code that does that.
addElement: function () {
var theNewElem = document.createElement('input');
theNewElem.setAttribute('type', '');
theNewElem.setAttribute('id', 'finaltons');
theNewElem.setAttribute('value', totaltotal);
document.getElementById('formtons').appendChild(theNewElem);
}
};
This hidden input box with the id finaltons, is used to set a session
variable which can be used to transfer my final total to another page.
This part is done in C#.
My problem is, if you hit the "Update Total" button multiple times I
get multiple hidden input box's which causes a problem with my session
variable. So what do I have to add to my code so it doesn't add the
input box if its already exists. Can this be done?
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