Actionscript 3 as3文本字段占位符
我有一个关于as3上textfield占位符的快速问题Actionscript 3 as3文本字段占位符,actionscript-3,Actionscript 3,我有一个关于as3上textfield占位符的快速问题 var placeholder_text:String = "Search"; myTextField.addEventListener(FocusEvent.FOCUS_IN, focusIn); myTextField.addEventListener(FocusEvent.FOCUS_OUT, focusOut); // fire when click to edit function focusIn(event:Event):
var placeholder_text:String = "Search";
myTextField.addEventListener(FocusEvent.FOCUS_IN, focusIn);
myTextField.addEventListener(FocusEvent.FOCUS_OUT, focusOut);
// fire when click to edit
function focusIn(event:Event):void
{
if(myTextField.text == placeholder_text)
{
myTextField.text = "";
}
}
// fire when you clicked out
function focusOut(event:Event):void
{
if(myTextField.text == "")
{
myTextField.text = placeholder_text;
}
}
所有现代浏览器或移动应用程序都支持文本输入字段的占位符。单击后,焦点将移到文本的开头,而占位符将保持不变,直到您开始键入为止
var placeholder_text:String = "Search";
myTextField.addEventListener(FocusEvent.FOCUS_IN, focusIn);
myTextField.addEventListener(FocusEvent.FOCUS_OUT, focusOut);
// fire when click to edit
function focusIn(event:Event):void
{
if(myTextField.text == placeholder_text)
{
myTextField.text = "";
}
}
// fire when you clicked out
function focusOut(event:Event):void
{
if(myTextField.text == "")
{
myTextField.text = placeholder_text;
}
}
只是想知道这是否可以在as3上存档
var placeholder_text:String = "Search";
myTextField.addEventListener(FocusEvent.FOCUS_IN, focusIn);
myTextField.addEventListener(FocusEvent.FOCUS_OUT, focusOut);
// fire when click to edit
function focusIn(event:Event):void
{
if(myTextField.text == placeholder_text)
{
myTextField.text = "";
}
}
// fire when you clicked out
function focusOut(event:Event):void
{
if(myTextField.text == "")
{
myTextField.text = placeholder_text;
}
}
干杯
比尔当然可以,但您需要手动处理该文本字段。常规例程是这样的:拥有一个TextField子类,该子类将拥有一个包含占位符文本的字段
var placeholder_text:String = "Search";
myTextField.addEventListener(FocusEvent.FOCUS_IN, focusIn);
myTextField.addEventListener(FocusEvent.FOCUS_OUT, focusOut);
// fire when click to edit
function focusIn(event:Event):void
{
if(myTextField.text == placeholder_text)
{
myTextField.text = "";
}
}
// fire when you clicked out
function focusOut(event:Event):void
{
if(myTextField.text == "")
{
myTextField.text = placeholder_text;
}
}
例如:
public class PlaceholderTF extends TextField
{
private var placeholderText:String;
private var currentText:String;
public function PlaceholderTF(prompt:String="Input text here") {
super(); // making a correct TextField out of ourselves
placeholderText = prompt;
currentText = "";
AWUTA = false;
text = "";
}
public override function set text(value:String):void {
if (currentText != value) {
currentText = value;
// calling built-in setter to correctly update text
if (currentText == null || currentText == "") {
super.text = placeholderText;
} else {
super.text = currentText;
}
}
}
}
var placeholder_text:String = "Search";
myTextField.addEventListener(FocusEvent.FOCUS_IN, focusIn);
myTextField.addEventListener(FocusEvent.FOCUS_OUT, focusOut);
// fire when click to edit
function focusIn(event:Event):void
{
if(myTextField.text == placeholder_text)
{
myTextField.text = "";
}
}
// fire when you clicked out
function focusOut(event:Event):void
{
if(myTextField.text == "")
{
myTextField.text = placeholder_text;
}
}
这个解决方案相当粗糙,但可能有效 下面是一个对我来说适用于表单验证的示例:
var placeholder_text:String = "Search";
myTextField.addEventListener(FocusEvent.FOCUS_IN, focusIn);
myTextField.addEventListener(FocusEvent.FOCUS_OUT, focusOut);
// fire when click to edit
function focusIn(event:Event):void
{
if(myTextField.text == placeholder_text)
{
myTextField.text = "";
}
}
// fire when you clicked out
function focusOut(event:Event):void
{
if(myTextField.text == "")
{
myTextField.text = placeholder_text;
}
}
package components {
import flash.events.Event;
import flash.events.FocusEvent;
import flash.text.TextField;
public class TextFieldPlaceholder extends TextField {
private var _placeholderText:String;
private var _currentText:String;
public function TextFieldPlaceholder(placeholderText:String = 'Input text here') {
_placeholderText = placeholderText;
_currentText = '';
this.addEventListener(FocusEvent.FOCUS_OUT, onFocusOut);
this.addEventListener(FocusEvent.FOCUS_IN, onFocusIn);
super();
}
override public function get text():String {
if (_currentText == _placeholderText) {
return '';
}
return _currentText;
}
override public function set text(value:String):void {
_currentText = value;
if (!_currentText) {
super.text = _placeholderText;
} else {
super.text = _currentText;
}
}
private function onFocusIn(e:Event):void {
super.text = _currentText;
}
private function onFocusOut(e:Event):void {
this.text = super.text;
}
}
}
您可以模仿Flex框架的实现。谢谢Jason,但是当文本焦点上的输入消失时。谢谢Vesper,但我认为此解决方案仅适用于清除文本字段,而不移动文本前面的焦点,nvm它甚至可能不存在。