[Rails-spinoffs] determining which button was clicked

[Iain Dooley]

hi, i'm not sure if this has already been discussed, but the forum 
interface search facility isn't working due to 'technical difficulties' 
and i can't find anything about it in google.

in Form.serialize there is nothing to tell you what button was clicked for 
a submit event. i've made the following change to prototype.js:

var form_submit_button_used = false;

var Form = {
  serialize: function(form) {
    var elements = Form.getElements($(form));
    var queryComponents = new Array();

    for (var i = 0; i < elements.length; i++) {

      var add_to_query = true;

      if(elements[i].type=="submit")
      {

if((elements[i].name!=form_submit_button_used)||(!form_submit_button_used))
              add_to_query = false;
      }

      if(add_to_query)
      {
          var queryComponent = Form.Element.serialize(elements[i]);

          if (queryComponent)
              queryComponents.push(queryComponent);
      }
    }

in order to use this, you have to set the form_submit_button_used variable 
to the name of the button that was clicked. i have implemented this 
function elsewhere, but it may be good to write a method called 
Form.prepareClickEvents or something like that so that it's bundled as 
part of prototype:

forms = document.forms;

for(i = 0;i<forms.length;i++)
{
    for(j = 0;j < forms[i].elements.length;j++)
    {
        var curr = forms[i].elements[j];

        if(curr.type == "submit")
            curr.onclick = setSubmittedName;
    }
}

function setSubmittedName()
{
  form_submit_button_used = this.name;
}

cheers

iain

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