How flash sets the translucent effect of dynamic text

Normally we use _alpha (AS2), alpha (AS3) to set the transparency value of an object, but using Alpha settings for dynamic text (or input text) is not valid. Online General Introduction method is to use draw bitmap way to deal with this problem, but this method is more troublesome, and later found that the original use of filters seems to be the text box into bitmap mode ... (The conceptual stuff doesn't understand, maybe not the reason, anyway, to achieve our effect), so use the filter mirror text box, you can set the alpha value normally, so there is the following function (note is AS2 code, AS3 Also, this is not much to say).

Import Flash.filters.BlurFilter;

Import Filter Class ... I chose a filter here.

Sets the filter. All values are set to 0 (no effect) so that the input box will display alpha correctly

function Enabledalpha (obj:object) {

Obj.filters = [New Blurfilter (0,0,0)]

}

Remove filter and return to normal state

function Disabledalpha (obj:object) {

Obj.filters = null

}

Use, txt to dynamic text instance name

Enabledalpha (TXT)

Txt._alpha = 50