jQuery.extend({ /** * 清除当前选择内容 */ unselectContents: function(){ if(window.getSelection) window.getSelection().removeAllRanges(); else if(document.selection) document.selection.empty(); } }); jQuery.fn.extend({ /** * 选中内容 */ selectContents: function(){ $(this).each(function(i){ var node = this; var selection, range, doc, win; if ((doc = node.ownerDocument) && (win = doc.defaultView) && typeof win.getSelection != 'undefined' && typeof doc.createRange != 'undefined' && (selection = window.getSelection()) && typeof selection.removeAllRanges != 'undefined') { range = doc.createRange(); range.selectNode(node); if(i == 0){ selection.removeAllRanges(); } selection.addRange(range); } else if (document.body && typeof document.body.createTextRange != 'undefined' && (range = document.body.createTextRange())) { range.moveToElementText(node); range.select(); } }); }, /** * 初始化对象以支持光标处插入内容 */ setCaret: function(){ if(!$.browser.msie) return; var initSetCaret = function(){ var textObj = $(this).get(0); textObj.caretPos = document.selection.createRange().duplicate(); }; $(this) .click(initSetCaret) .select(initSetCaret) .keyup(initSetCaret); }, /** * 在当前对象光标处插入指定的内容 */ insertAtCaret: function(textFeildValue){ var textObj = $(this).get(0); if(document.all && textObj.createTextRange && textObj.caretPos){ var caretPos=textObj.caretPos; caretPos.text = caretPos.text.charAt(caretPos.text.length-1) == '' ? textFeildValue+'' : 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.focus(); var len=textFeildValue.length; textObj.setSelectionRange(rangeStart+len,rangeStart+len); textObj.blur(); } else { textObj.value+=textFeildValue; } } });
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