類型錯誤：錯誤＃2007：參數文字必須爲非空

Question

我新的閃光燈和我真的不知道什麼是我得到這個錯誤的原因：

TypeError: Error #2007: Parameter text must be non-null.
at flash.text::TextField/set text()
at sgmap_fla::MainTimeline/mapOver()

我的動作：

description.countryName_txt.text = ""; 
description.zone_txt.text = ""; 

map_mc.buttonMode=true; 

map_mc.addEventListener(MouseEvent.MOUSE_OVER, mapOver); 
map_mc.addEventListener(MouseEvent.MOUSE_OUT, mapOut); 

map_mc.northZone.countryName = "Singapore"; 
map_mc.northZone.zone = "North Zone"; 

map_mc.centralZone.countryName = "Singapore"; 
map_mc.centralZone.zone = "Central Zone"; 

map_mc.eastZone.countryName = "Singapore"; 
map_mc.eastZone.zone = "East Zone"; 

map_mc.westZone.countryName = "Singapore"; 
map_mc.westZone.zone = "West Zone"; 

map_mc.southZone.countryName = "Singapore"; 
map_mc.southZone.zone = "South Zone"; 

function mapOver(e:MouseEvent):void{ 
    var mapItem:MovieClip = e.target as MovieClip; 
    description.countryName_txt.text = mapItem.countryName; 
    description.zone_txt.text = mapItem.zone; 
    description.gotoAndStop(mapItem.name); 
    TweenMax.to(mapItem, .5, {tint:0xFF9900}); 
    TweenMax.fromTo(description, .5, {alpha:0, x:50, blurFilter:{blurX:80}}, {alpha:1, x:10, blurFilter:{blurX:0}}); 
    } 

function mapOut(e:MouseEvent):void{ 
    var mapItem:MovieClip = e.target as MovieClip; 
    TweenMax.to(mapItem, .5, {tint:0x990000}); 
    } 

Answer 1

文本字段文本不能爲空。

具體而言，此錯誤是由將文本字段text屬性設置爲null引起的。這可以用TextField經典文本複製：

經典文本：

var tf:TextField = new TextField(); 
tf.text = null; 

這將引發錯誤的引用：

Error #2007: Parameter text must be non-null.

TLF文本沒有這個問題，並且可以設置爲空。

根據您的實施情況，這發生在您的mapOver(e:MouseEvent)函數中。 mapItem.countryName或mapItem.zone爲空。它們很可能都是空的。

var mapItem:MovieClip = e.target as MovieClip; 
description.countryName_txt.text = mapItem.countryName; // null 
description.zone_txt.text = mapItem.zone;    // null 

鼠標事件似乎不會從您期望的範圍中調度。你有map_mc監聽器：

map_mc.addEventListener(MouseEvent.MOUSE_OVER, mapOver); 

它看起來像你期待從以下任何影片剪輯的這一事件：northZone，centralZone，eastZone，westZone和southZone。這些符號具有您正在查找的屬性;但是，map_mc不。

所以，根本原因是你的事件監聽器e.target不是你期待的符號。

驗證什麼符號e.target是。這可能map_mc不具有您所期待的特性：

map_mc.countryName; // doesn't exist 
mac_mc.zone;  // doesn't exist 

您正在尋找有關的map_mc孩子這些屬性：

map_mc.northZone.countryName; 
map_mc.northZone.zone; 

map_mc.centralZone.countryName; 
map_mc.centralZone.zone; 

// etc...