验证JSON数组长度(Validate JSON array length)

 我正在尝试编写一个if语句来确定getDept JSON数组是否包含多个值。 如果是，则重定向到不同的页面。 通过我的研究，似乎它就像getDept.length > 1一样简单，但我还是无法完成这项工作。 
 
 我的Javascript代码如下： 
 
$.getJSON("https://apex.oracle.com/pls/apex/mfajertest1/department/"+$x('P2_DEPT_NO').value, function(getDept) 
{
    console.log(getDept);
    if(getDept.length == 0)
        {
                window.alert("No Department with that ID");
        }
    else if(getDept.length > 1)
        {   
                apex.navigation.redirect('f?p=71293:11');
        }
    else
        {
    $x('P2_DEPT_NAME').readOnly = false;
    $x('P2_DEPT_NAME').value=getDept.items[0].dname;
    $x('P2_DEPT_NAME').readOnly = true;
    $x('P2_DEPT_LOC').readOnly = false;
    $x('P2_DEPT_LOC').value=getDept.items[0].loc;
    $x('P2_DEPT_LOC').readOnly = true;
    $x('P2_DEPT_NO').readOnly = true;
  }
});
 
 getDept JSON数组包含以下信息： 
 
{
    "next": {
        "$ref": "https://apex.oracle.com/pls/apex/mfajertest1/department/%7Bid%7D?page=1"
    },
    "items": [
        {
            "deptno": 10,
            "dname": "accounting",
            "loc": "madison"
        },
        {
            "deptno": 20,
            "dname": "Finance",
            "loc": "Milwaukee"
        },
        {
            "deptno": 30,
            "dname": "IT",
            "loc": "La Crosse"
        },
        {
            "deptno": 40,
            "dname": "Purchasing",
            "loc": "Green Bay"
        },
        {
            "deptno": 10,
            "dname": "Accounting II",
            "loc": "Madison II"
        },
        {
            "deptno": 50,
            "dname": "Sports",
            "loc": "Waukasha"
        }
    ]
}
 
 如果需要，我很乐意提供有关此问题的更多信息。 

I am trying to write an if statement that determines whether the getDept JSON array contains more than one value. If it does, then redirect to a different page. Through my research, it seems like it is as simple as getDept.length > 1, I have not been able to make this work though.
 
My Javascript code is as follows:
 
$.getJSON("https://apex.oracle.com/pls/apex/mfajertest1/department/"+$x('P2_DEPT_NO').value, function(getDept) 
{
    console.log(getDept);
    if(getDept.length == 0)
        {
                window.alert("No Department with that ID");
        }
    else if(getDept.length > 1)
        {   
                apex.navigation.redirect('f?p=71293:11');
        }
    else
        {
    $x('P2_DEPT_NAME').readOnly = false;
    $x('P2_DEPT_NAME').value=getDept.items[0].dname;
    $x('P2_DEPT_NAME').readOnly = true;
    $x('P2_DEPT_LOC').readOnly = false;
    $x('P2_DEPT_LOC').value=getDept.items[0].loc;
    $x('P2_DEPT_LOC').readOnly = true;
    $x('P2_DEPT_NO').readOnly = true;
  }
});
 
The getDept JSON array contains this information:
 
{
    "next": {
        "$ref": "https://apex.oracle.com/pls/apex/mfajertest1/department/%7Bid%7D?page=1"
    },
    "items": [
        {
            "deptno": 10,
            "dname": "accounting",
            "loc": "madison"
        },
        {
            "deptno": 20,
            "dname": "Finance",
            "loc": "Milwaukee"
        },
        {
            "deptno": 30,
            "dname": "IT",
            "loc": "La Crosse"
        },
        {
            "deptno": 40,
            "dname": "Purchasing",
            "loc": "Green Bay"
        },
        {
            "deptno": 10,
            "dname": "Accounting II",
            "loc": "Madison II"
        },
        {
            "deptno": 50,
            "dname": "Sports",
            "loc": "Waukasha"
        }
    ]
}
 
I would be glad to provide more information regarding this issue if need be. 

原文：https://stackoverflow.com/questions/33421565