如何使用JavaScript获取查询字符串，如果没有查询字符串

Question

我有以下代码来查询查询字符串值并返回不同的链接，具体取决于用户选择哪个过滤器（用查询字符串重新加载页面）。

它工作正常，如果用户选择一个过滤器和页面重新加载。无论如何，第一次加载页面时没有查询字符串，并且javascript中断导致一些图像/链接不能显示。下面的代码

var goPage=new Array(6); 

var search = location.search; 
search = search.replace(/\?/,''); 
var searchAttributes = search.split('&'); 

for(var no=0;no<searchAttributes.length;no++){ 
    var items = searchAttributes[no].split('='); 
    eval("var "+items[0]+" = '"+items[1]+"';"); 
} 
queryString = SelectedID; 

var goPage=new Array(6); 

if (queryString == "") 
{ 
goPage[0]='https://company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Objective%20Status.aspx'; 
goPage[1]='https://company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Priorities%20Status.aspx'; 
goPage[2]='https://company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Milestone%20Status.aspx'; 
goPage[3]='https://company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Moved%20to%20Green%20Last%2030.aspx'; 
goPage[4]='https://company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Moved%20to%20Amber%20Last%2030.aspx'; 
goPage[5]='https://company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Moved%20to%20Red%20Last%2030.aspx'; 
} 

if (queryString == 25) 
{ 
goPage[0]='https://company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Objective%20Status.aspx?View={D2ADE53F-8C47-4787-80AE-6F90C84206B5}&FilterField1=Strategic_x0020_ObjectiveFilterValue1=A.%20Industry%20leadership%20through%20technical%20excellence%2C%20self%20performance%2C%20safety%20and%20environment'; 

goPage[1]='company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Priorities%20Status.aspx?SortField=Strategic_x0020_Objective&SortDir=Asc&View={9AE43100-E1E7-4705-A4C5-D8FE7326714E}&FilterField1=Strategic_x0020_Objective&FilterValue1=A.%20Industry%20leadership%20through%20technical%20excellence%2C%20self%20performance%2C%20safety%20and%20environment'; 

goPage[2]='company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Milestone%20Status.aspx?View={F9DFB655-BB78-4A66-8F65-98D37B07B9B5}&FilterField1=Strategic_x0020_Objective&FilterValue1=A.%20Industry%20leadership%20through%20technical%20excellence%2C%20self%20performance%2C%20safety%20and%20environment'; 

goPage[3]='company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Moved%20to%20Green%20Last%2030.aspx'; 

goPage[4]='company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Moved%20to%20Amber%20Last%2030.aspx?View={E2142842-9815-4FFC-9297-C0F0D8E93796}&FilterField1=Strategic_x0020_ObjectiveFilterValue1=A.%20Industry%20leadership%20through%20technical%20excellence%2C%20self%20performance%2C%20safety%20and%20environment'; 

goPage[5]='company.sharepoint.apac.microsoftonline.com/Lists/Strategic%20Items/Moved%20to%20Red%20Last%2030.aspx'; 
} 

任何关于如何改变我得到查询字符串的建议，所以如果没有JavaScript不会中断？

Answer 1

你可以使用这样的事情：

GetQueryStringValue:function(url, name) 
{  
    name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]"); 
    var regexS = "[\\?&]"+name+"=([^&#]*)"; 
    var regex = new RegExp(regexS); 
    var results = regex.exec(url); 
    if(results == null) 
     return undefined;  
    return results[1];  
}; 

，那么你可以这样做：

var SelectedID = GetQueryStringValue(window.location.href, 'SelectedID'); 
if(SelectedID) 
{ 
    if(SelectedID==25) 
    { 
     //goPage[...] 
    } 
} 
else 
{ 
    //SelectedID is undefined 
    //goPage[...] 
}