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可能重复：
如何去除 url 变量

我有网址http://localhost/abc/detail.cfm?iId=1711471&countrysearch=3693&itemnumbersearch=&keywordsearch=&purl=%2FIGPCI%2Fthumbs%2Ecfm%3Fcountrysearch%3D3693%26itemnumbersearch%3D%26keywordsearch%3D%26x%3D78%26y%3D10&productid=1111&recordindex=1。
每次我需要准备具有 productid 和 recordindex 新值的新 URL 时，我想在单击名为“next”的链接上搜索产品详细信息。例如，关于 countryid="3693"，我有四个产品，

productid productname 
1           p1
2           p2
3           p3
4           p4

下次单击新 URL 时准备 productid=1 和 recordindex=1，再次单击 URL 为 productid=2 和记录 id =2，依此类推。

为了获取 URL，我使用了以下代码：

 <cfset currentURL = "#CGI.SERVER_NAME#" & "#CGI.PATH_INFO#" & "#CGI.query_string#">

这给了我当前的网址

然后我用下面的代码准备新的网址：

<cfif queryString.recordset gt 0> <cfset recordindex=#recordindex#+1> <cfset newUrl=currentURL & '&productid=#queryString.poductid[recordindex]#&recordindex=#recordindex#' </cfif>

使用此代码，每次它都将 url 值与旧的附加到新的。喜欢：

http://localhost/abc/detail.cfm?iId=1711471&countrysearch=3693&itemnumbersearch=&keywordsearch=&purl=%2FIGPCI%2Fthumbs%2Ecfm%3Fcountrysearch%3D3693%26itemnumbersearch%3D%26keywordsearch%3D%26x%3D78%26y%3D10&productid=1111&recordindex=1&productid=2&recordindex=2

我的问题是如何在旧 URL 中删除旧的&productid=1111&recordindex=1。我尝试使用替换功能，但它在字符串匹配时替换，在我的情况下，每次产品和记录索引值都发生变化。如何使用正则表达式删除旧字符串。请帮我。

谢谢

4

1 回答 1

2

你不需要正则表达式。事实上，有人已经为此构建了一个 UDF。

查询字符串删除变量

例子：

<cfset currentURL = CGI.SERVER_NAME & CGI.PATH_INFO & queryStringDeleteVar("productid,recordindex")>

UDF 代码：

<cfscript>
/**
 * Deletes a var from a query string.
 * Idea for multiple args from Michael Stephenson (michael.stephenson@adtran.com)
 * 
 * @param variable      A variable, or a list of variables, to delete from the query string. 
 * @param qs      Query string to modify. Defaults to CGI.QUERY_STRING. 
 * @return Returns a string. 
 * @author Nathan Dintenfass (michael.stephenson@adtran.comnathan@changemedia.com) 
 * @version 1.1, February 24, 2002 
 */
function queryStringDeleteVar(variable){
    //var to hold the final string
    var string = "";
    //vars for use in the loop, so we don't have to evaluate lists and arrays more than once
    var ii = 1;
    var thisVar = "";
    var thisIndex = "";
    var array = "";
    //if there is a second argument, use that as the query string, otherwise default to cgi.query_string
    var qs = cgi.query_string;
    if(arrayLen(arguments) GT 1)
        qs = arguments[2];
    //put the query string into an array for easier looping
    array = listToArray(qs,"&");        
    //now, loop over the array and rebuild the string
    for(ii = 1; ii lte arrayLen(array); ii = ii + 1){
        thisIndex = array[ii];
        thisVar = listFirst(thisIndex,"=");
        //if this is the var, edit it to the value, otherwise, just append
        if(not listFind(variable,thisVar))
            string = listAppend(string,thisIndex,"&");
    }
    //return the string
    return string;
}
</cfscript>

虽然，由于您要替换 URL 参数值，但QueryStringChangeVar可能更符合您的要求。

<cfscript>
/**
 * Changes a var in a query string.
 * 
 * @param name      The name of the name/value pair you want to modify. (Required)
 * @param value      The new value for the name/value pair you want to modify. (Required)
 * @param qs      Query string to modify. Defaults to CGI.QUERY_STRING. (Optional)
 * @return Returns a string. 
 * @author Nathan Dintenfass (nathan@changemedia.com) 
 * @version 2, September 5, 2002 
 */
function QueryStringChangeVar(variable,value){
    //var to hold the final string
    var string = "";
    //vars for use in the loop, so we don't have to evaluate lists and arrays more than once
    var ii = 1;
    var thisVar = "";
    var thisIndex = "";
    var array = "";
    var changedIt = 0;
    //if there is a third argument, use that as the query string, otherwise default to cgi.query_string
    var qs = cgi.query_string;
    if(arrayLen(arguments) GT 2)
        qs = arguments[3];

    //put the query string into an array for easier looping
    array = listToArray(qs,"&");
    //now, loop over the array and rebuild the string
    for(ii = 1; ii lte arrayLen(array); ii = ii + 1){
        thisIndex = array[ii];
        thisVar = listFirst(thisIndex,"=");
        //if this is the var, edit it to the value, otherwise, just append
        if(thisVar is variable){
            string = listAppend(string,thisVar & "=" & value,"&");
            changedIt = 1;
        }
        else{
            string = listAppend(string,thisIndex,"&");
        }
    }
    //if it was not changed, add it!
    if(NOT changedIt)
        string = listAppend(string,variable & "=" & value,"&");
    //return the string
    return string;
}
</cfscript>
于 2012-09-07T12:30:11.580 回答