Error message based on text in a drop-down menu...

Question

So I have a simple number field and a text drop-down box (with, let's say, the values "Blue", "Red" and "Green".)
I want to set a minimum and maximum (say between 5 and 20) value on the number field and send an error if the user enters a number outside of that range. BUT the range can be different depending on if the user selects Blue, Red or Green from the drop-down menu.
So for Blue, the range might be 5-20; for Red 7-22, and Green 10-25.
SO if the user chooses Blue then enters a 4 or a 21, he'll get an error message prompting him to specifiy a value that is from 5-20.
That's it, in a nutshell.
Any help I could get would be awesome. Thanks in advance.
Thanks,
T.

Answer 1

There are several events to consider here:
1. The drop-down value is changed without any values in the text field
2. The drop-down value is changed with a value in the text field
3. The value of the text field is changed (I'm assuming there's no "blank" value in the drop-down, or there will be another event, where the value of the text field is changed when the "blank" option is selected)
You need to decide how to treat each event. I would recommend resetting the text field each time the value of the drop-down is changed. Otherwise you will need to perform the validation from two different sources.
To do that add the following code to the drop-down's custom validation script (replace "Text1" with the actual field's name):
this.resetForm(["Text1"]);
The code you can use for the text field can be something like this, as the custom validation script (replace "Color Selection" with the actual field's name):
event.rc = true;
if (event.value) {
    var color = this.getField("Color Selection").value;
    var min=0,max=0;
    if (color=="Blue") {
        min = 5;
        max = 20;
    } else if (color=="Red") {
        min = 7;
        max = 22;
    } else if (color=="Green") {
        min = 10;
        max = 25;
    var v = Number(event.value);
    if (v<min || v>max) {
        app.alert("Error! The value must be between " + min + " and " + max);
        event.rc = false;