Question

我已经成功完成了返回单个字符串和cfdump的教程。但是我需要帮助返回带有项列表的查询的语法。

同样是半repost，因为看起来我的上一个问题在回复中消失了。

问题：我正在尝试使用带有json格式的jquery从调用cfc的.cfm页面输出查询。有人能告诉我我的错吗？

我目前收到错误消息。

SyntaxError: JSON.parse: unexpected character.

在我的.html页面中我有

   <html>
<head>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <script type="text/javascript"> 
    $(document).ready(function(){ 

    $("#runQuery").click(function () {

        $.ajax({

            type: "GET",
            url: "./test.cfm",
            dataType: "json",
            success: function (resp, textStatus, jqXHR) {
                buildResultsTable(resp);
            },
            error: function (jqXHR, textStatus, errorThrown)
            {
                alert(errorThrown); 
            }
        });

    });


    function buildResultsTable(resp)
    {
        var tmp_html = $("<tr />");
        var j = 0;

            $("#results").html(""); 

            for (var i = 0; i < resp["COLUMNS"].length; i++)
            {
                var tmp_th = $("<th />");   
                tmp_th.text(resp["COLUMNS"][i]);
                tmp_html.append(tmp_th);
            }
            $("#results").append(tmp_html);

            for (j = 0; j < resp["DATA"].length; j++)
            {
                tmp_html = $("<tr />");

                for (var i = 0; i < resp["DATA"][j].length; i++)
                {
                    var tmp_td = $("<td />");   
                    tmp_td.text(resp["DATA"][j][i]);
                    tmp_html.append(tmp_td);
                }
                $("#results").append(tmp_html);
            }

    }

    })
    </script>

</head>

<body>
    <input type="button" id="runQuery" value="Show Teams" />
    <input type="text" name="name">

    <table id="results" cellspacing="0" cellpadding="0">
</table>


</body>
</html>

在我的test.cfm调用页面中，我有

   <cfinvoke 
   component="learncf_jquery" 
   method="getAllTeams" 
   returnVariable="getItems">
   </cfinvoke>

  <cfoutput>#SerializeJSON(getItems)#</cfoutput>

test.cfm输出看起来像

{"COLUMNS":["TEAM"],"DATA":[["Dallas Cowboys"],["NY Giants"],["Philadelphia Eagles"],["Washington Redskins"]]}

learncf_jquery.cfc（来自其他教程的代码）

<cfcomponent name="jQueryExample" output="false">

<cffunction name="getAllPlayers" output="false" access="private" returntype="query">
    <cfset var qAllPlayers = queryNew('playerName, team') />

    <cfset queryAddRow(qAllPlayers, 40) />

    <!--- add 10 Giants players to the "database" --->
    <cfset querySetCell(qAllPlayers, 'playerName', 'Alford, Jay', 1) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 1) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Barden, Ramses', 2) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 2) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Beckum, Travis', 3) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 3) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Bernard, Rocky', 4) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 4) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Blackburn, Chase', 5) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 5) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Boss, Kevin', 6) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 6) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Bradshaw, Ahmad', 7) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 7) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Canty, Chris', 8) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 8) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Diehl, David', 9) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 9) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Feagles, Jeff', 10) />
    <cfset querySetCell(qAllPlayers, 'team', 'NY Giants', 10) />

    <!--- add 10 Cowboys players to the "database" --->
    <cfset querySetCell(qAllPlayers, 'playerName', 'Adams, Flozell', 11) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 11) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Austin, Miles', 12) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 12) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Brown, Courtney', 13) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 13) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Choice, Tashard', 14) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 14) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Colombo, Marc', 15) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 15) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Davis, Leonard', 16) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 16) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Jones, Felix', 17) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 17) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Kitna, Jon', 18) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 18) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Procter, Corey', 19) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 19) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Romo, Tony', 20) />
    <cfset querySetCell(qAllPlayers, 'team', 'Dallas Cowboys', 20) />

    <!--- add 10 Eagles players to the "database" --->
    <cfset querySetCell(qAllPlayers, 'playerName', 'Akers, David', 21) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 21) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Baskett, Hank', 22) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 22) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Booker, Lorenzo', 23) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 23) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Clemons, Chris', 24) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 24) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Demps, Quintin', 25) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 25) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Feeley, A.J.', 26) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 26) />

    <cfset querySetCell(qAllPlayers, 'playerName', 'Hobbs, Ellis', 27) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 27) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Jackson, DeSean', 28) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 28) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Klecko, Dan', 29) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 29) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'McNabb, Donovan', 30) />
    <cfset querySetCell(qAllPlayers, 'team', 'Philadelphia Eagles', 30) />

    <!--- add 10 Redskins players to the "database" --->
    <cfset querySetCell(qAllPlayers, 'playerName', 'Alexander, Lorenzo', 31) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 31) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Campbell, Jason', 32) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 32) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Clark, Devin', 33) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 33) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Cooley, Chris', 34) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 34) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Dixon, Antonio', 35) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 35) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Fletcher, London', 36) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 36) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Hackett, D.J.', 37) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 37) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Randle El, Antwaan', 38) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 38) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Smoot, Fred', 39) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 39) />
    <cfset querySetCell(qAllPlayers, 'playerName', 'Suisham, Shaun', 40) />
    <cfset querySetCell(qAllPlayers, 'team', 'Washington Redskins', 40) />

    <cfreturn qAllPlayers />
</cffunction>

<cffunction name="getAllTeams" access="remote" output="false" returntype="query">
    <cfset var allPlayers   = getAllPlayers() />
    <cfset var qGetAllTeams = "" />

    <cfquery name="qGetAllTeams" dbtype="query">
        SELECT DISTINCT team FROM allPlayers ORDER BY team
    </cfquery>

    <cfreturn qGetAllTeams />
</cffunction>

Answer 1

我已经在我的本地方框中测试了你的代码，它运行正常，代码没问题。在你的情况下唯一的问题可能是你已经启用了coldfusion调试输出，这可能会妨碍你的json格式。在页面顶部添加此代码：<cfsetting ShowDebugOutput = "false"/>，生成json响应（在您的情况下为test.cfm），以禁用coldfusion调试器。测试并告诉我你发现了什么。有关详细信息，请访问以下URL。 http://www.mindfiresolutions.com/While-working-with-AJAX-ColdFusion-Debugging-may-break-your-Ajax-calls-1477.php

否则，在您的响应页面中必须存在一些妨碍json响应的其他不需要的字符串

Answer 2

尝试添加此代码：

<cfcontent type="application/json" reset="true"><cfoutput>#SerializeJSON(getItems)#</cfoutput><cfabort>

这将清除请求内容并在输出json之前设置正确的标题，并在之后立即结束请求。

使用jquery ajax json格式，如何从.cfm页面输出查询到调用html页面？

2 个答案: