Get old value in onchange event function

[RottPaws]

Is it possible to retrieve the old value for a text input control in a function that is run by an onchange or onblur event?

I've got a series of records that are retrieved and when a field in one record is changed, I'd like to loop through the remaining form elements and update any other records with the same old value to the new value.

_________
Rott Paws

...It's not a bug. It's an undocumented feature!!!

 

[BabyJeffy]

You could loop through them using javascript when the page has loaded and set a custom attribute on the input elements - set to the same as the value attribute. Your code could then test the custom attribute against the current value element, and likewise could loop and update other "like" values.

Does this make sense?

Cheers,
Jeff

[tt]Jeff's Page [/tt][tt]@[/tt][tt] Code Couch

http://www.codecouch.com/jeff/

[/tt]

What is Javascript? faq216-6094

 

[theniteowl]

How do you store the information on the page? Do you have it in an array? If so you could have your onchange event pass the index number in the array that the data resides in.
Your function would look up the old value in the array and then know what the old and new values are.



Paranoid? ME?? WHO WANTS TO KNOW????

 

[BillyRayPreachersSon]

You should check out the "defaultValue" property of the text inputs. It contains the value the input has when it is delivered to the page. It was made for the job ;o)

Hope this helps,
Dan



[tt]Dan's Page [blue]@[/blue] Code Couch

http://www.codecouch.com/dan/

[/tt]

 

[BabyJeffy]

That's probably how they get the Reset button to work Nice one Dan.

Cheers,
Jeff

[tt]Jeff's Page [/tt][tt]@[/tt][tt] Code Couch

http://www.codecouch.com/jeff/

[/tt]

What is Javascript? faq216-6094

 

[RottPaws]

defaultValue...... I was searching for oldvalue ("grew up" in MS Access), originalValue, startValue....

I knew there had to be something like that.

Thanks a bunch!

_________
Rott Paws

...It's not a bug. It's an undocumented feature!!!

 

[RottPaws]

For anybody who's interested, here's what I ended up with.

I call the function in the onchange() event, sending the element's ID and name.

<INPUT type="text" name="carrier" id="carrier2" value="MCIMETRO, ATS, INC." size="45" onchange="controlUpdate(this.id, this.name)">

Then I loop the the elements of the form, updating any controls with the same name and the default value of the one that was changed.

//Function to update fields when one is changed
function controlUpdate(updatedElement, elementName){

    var newValue;
    var oldValue;

    newValue = document.submit_form.elements[updatedElement].value;
    oldValue = document.submit_form.elements[updatedElement].defaultValue;

    //alert ("Element: " + updatedElement + "\nOriginal Value: " + oldValue + "\nNew Value: " + newValue);

    for(e=0; e<document.submit_form.length; e++){

		if (document.submit_form.elements[e].name == elementName){

            //If the current value is the same as the one that was changed, update it
			if (document.submit_form.elements[e].value == oldValue){
			    document.submit_form.elements[e].value = newValue;
			}
		}
    }
}

_________
Rott Paws

...It's not a bug. It's an undocumented feature!!!