日期:2014-05-16 浏览次数:20621 次
var xmlHttp1; function createXmlHttp(){ if(window.XMLHttpRequest){ xmlHttp1=new XMLHttpRequest(); } else{ xmlHttp1=new ActiveXObect("Microsoft.XMLHTTP"); } } function showJson(pageName){ createXmlHttp(); xmlHttp1.onreadystatechange=JsonCallBack; xmlHttp1.open("post",pageName,true); xmlHttp1.setRequestHeader( "Content-Type ", "application/x-www-form-urlencoded "); xmlHttp1.send(null); } function JsonCallBack(){ if(xmlHttp1.readyState==4){ if(xmlHttp1.status==200){ alert(xmlHttp1.responseText); var s='xmlHttp1.responseText'; //这里返回另一个jsp页面的数据 var optioninfo=eval('('+s+')'); [color=#FF0000]这里无法将返回的数据转化为json格式....[/color] var select=document.getElementById("test"); for(var o in optioninfo){ select.appendChild(createOption(o,optioninfo[o])); } [color=#FF0000]想把返回的数据依次加入到select中去,结果失败,alert(optioninfo.id)一下是undefined!这部分哪里错了?[/color] var user={'id':'2','name':'CSDN'}; [color=#FF0000]单独写个json[/color] for(var o in user){ select.appendChild(createOption(o,user[o])); } [color=#FF0000]这样做就可以实现向下拉框中添加数据[/color] } else{alert('请求操作返回数据未成功!');} } } function createOption(value,text){ var opt=document.createElement("option"); opt.setAttribute("value",value); opt.appendChild(document.createTextNode(text)); return opt; }
<body> <% StringBuffer buffer=new StringBuffer("{"); buffer.append("'"); buffer.append("id"); buffer.append("':'"); buffer.append("2"); buffer.append("'"); buffer.append(","); buffer.append("'"); buffer.append("name"); buffer.append("':'"); buffer.append("CSDN"); buffer.append("'"); buffer.append("}"); out.print(buffer.toString()); %> </body> </html>