高亮字符串搜索字符串

Question

我正在使用下面的代码在 textarea 中的文本中搜索在 textinput 中输入的字符串。我试图在搜索后突出显示 textarea 中的字符串。我认为这样做的方法是selectRange()。我不确定如何找到 selectRange() 的第二个参数的 endIndex。以下是我所拥有的：

protected function searchBtn_clickHandler(event:MouseEvent):void
{
    text = mainTextField.text;
    search_Str = searchTxt.text;

    var search_result:int = text.search(search_Str);
    trace(search_result);

编辑

    <?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" title="HomeView">
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>
    <s:titleContent>
        <s:TextInput id="searchTxt"/>
        <s:Button label="Button" click="searchBtn_clickHandler(event)"/>
    </s:titleContent>
    <s:TextArea id="mainTextField" x="33" y="35" width="544" height="444"/>
    <fx:Script>
        <![CDATA[
            public var text:String;
            public var search_Str:String;

            protected function searchBtn_clickHandler(event:MouseEvent):void
        {
            text = mainTextField.text;
            search_Str = searchTxt.text;

            var search_result:int = text.search(search_Str);
            trace(search_result); // Traces correct int values
            trace(mainTextField.selectRange(search_result,search_result+search_Str.length)); // Traces "undefined"
        }
        ]]>
    </fx:Script>
</s:View>

Answer 1

你不能只根据搜索字符串的长度来计算吗？

修改后的代码如下：

protected function searchBtn_clickHandler(event:MouseEvent):void
{
    text = mainTextField.text;
    search_Str = searchTxt.text;

    var search_result:int = text.search(search_Str);
    trace(search_result);
    mainTextField.selectRange(search_result,search_result+search_Str.length);
}

---

更新，响应原发帖者的代码更新；我继续测试。如果没有焦点，TextAre 将不会将项目显示为选中状态。因此，使选定范围突出显示的解决方案是在单击按钮后将焦点设置为 textArea。这是演示此的代码：

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" title="HomeView">
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>

    <s:titleContent>
        <s:TextInput id="searchTxt" text="Quick" />
        <s:Button label="Button" click="searchBtn_clickHandler(event)"/>
    </s:titleContent>
    <s:TextArea id="mainTextField" x="33" y="35" width="544" height="444" text="The Quick Brown Fox Jumped Over The Lazy Dogs"/>
    <fx:Script>
        <![CDATA[
            public var text:String;
            public var search_Str:String;

            protected function searchBtn_clickHandler(event:MouseEvent):void
            {
                mainTextField.setFocus();
                text = mainTextField.text;
                search_Str = searchTxt.text;

                var search_result:int = text.search(search_Str);
                trace(search_result); // Traces correct int values
                trace(search_result+search_Str.length);
//              trace(mainTextField.selectRange(search_result,search_result+search_Str.length)); // Traces "undefined"
                mainTextField.selectRange(search_result,search_result+search_Str.length)
            }
        ]]>
    </fx:Script>


</s:View>