JS variable Question

[comp615]

Hello I am trying to integrate a bit of js into a php page...my JS looks like:

function update_checkbox(fieldName,fieldValue,fieldType) {
  if(fieldType==1) {
  	dkpType = 'ontime';
  } else {
  	dkpType = 'endtime';
  }
  dkpField = 'document.forms["DKP"].dkp_' + fieldName + '';
  dkpCheckbox = 'document.forms["DKP"].' + dkpType + '_' + fieldName + '';
  dkpValue = dkpField.value;
  alert(dkpValue);
  if(dkpCheckbox.checked) {
	  dkpValue = (dkpValue + fieldValue);
  } else {
	  dkpValue = (dkpValue - fieldValue);
  }
  dkpField.value = value;
}

However, the problem is that somewhere around dkpValue = dkpField.value; things get wierd...if I plug in literally 'document.forms["DKP"].dkp_1.value'; it works, and dkpField outputs 'document.forms["DKP"].dkp_1' however, when I try to add .value onto it to get the value it keeps coming back undefined...any ideas.

Also, as a side note, I wanted to use arrays for php but js doesn't work that way? I wanted 'document.forms["DKP"].dkp[1]', but that seems to cause troubles in making it think its a js array or something...is this right?

Thanks for the help!

[DynamicTech]

dkpField = 'document.forms["DKP"].dkp_' + fieldName + '';
  dkpCheckbox = 'document.forms["DKP"].' + dkpType + '_' + fieldName + '';
  dkpValue = dkpField.value;

dkpField is a String value, not the value of the form field. To get the value of the form field, you will have to do something like:

var myDkpField = document.getElementById('my_form_element');
var dkpValue = myDkpField.value;

or

var dkpValue = document.forms.my_form.my_form_element.value;