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axl234
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微博插入话题的效果实现

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>

<style>
.textarea{width:60%; height:100px; padding:3px; font-size:1em;}
</style>
</head>

<body>

<div id="main">
 <h1>微博插入话题的效果实现实例页面</h1>
    <div id="body">
     
        <div id="effect" class="part">
         <h3>效果:</h3>
            <div class="show">
             <div class="demo">
                 <textarea id="textarea" class="textarea"></textarea>
                    <p><button id="button">插入话题</button></p>
                </div>
            </div>
        </div>      
    </div>
</div>
<script>
var oButton = document.getElementById("button"), oTextarea = document.getElementById("textarea");
var TOPIC = "插入话题";
var funGetSelected = function(element) {
 if (!window.getSelection) {
  //IE浏览器
  return document.selection.createRange().text;
 } else {
  return element.value.substr(element.selectionStart, element.selectionEnd - element.selectionStart);
 }
}, funInsertTopic = function(textObj) {
 var topic = "#" + TOPIC + "#", value = textObj.value, index = value.indexOf(topic);
 if (index === -1) {
  //匹配
  funTextAsTopic(textObj, topic);
 }
 value = textObj.value;
 index = value.indexOf(topic);
 if (textObj.createTextRange) {
  var range = textObj.createTextRange();
        range.moveEnd("character", -1 * value.length)          
        range.moveEnd("character", index + 5);
        range.moveStart("character", index + 1);
        range.select(); 
 } else {
  textObj.setSelectionRange(index + 1, index + 5);
        textObj.focus();
 }
}, funTextAsTopic = function(textObj, textFeildValue) {
 textObj.focus();
 if (textObj.createTextRange) {
  var caretPos = document.selection.createRange().duplicate();
  document.selection.empty();
  caretPos.text = textFeildValue;
 } else if (textObj.setSelectionRange) {
  var rangeStart = textObj.selectionStart;
  var rangeEnd = textObj.selectionEnd;
  var tempStr1 = textObj.value.substring(0, rangeStart);
  var tempStr2 = textObj.value.substring(rangeEnd);
  textObj.value = tempStr1 + textFeildValue + tempStr2;
  textObj.blur();
 }
};
oButton.onclick = function() {
 var textSelection = funGetSelected(oTextarea);
 if (!textSelection || textSelection === TOPIC) {
  //没有文字选中,光标处插入
  funInsertTopic(oTextarea); 
 } else {
  funTextAsTopic(oTextarea, "#" + textSelection + "#");
 }
};


</script>

</body>
</html>

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