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我试图通过产品的onChange事件上的javascript获取Dynamics CRM 2016中产品的价格。这是我创建的一个自定义实体，正在使用pricelistid和productid。Dynamics CRM 2016：JavaScript导致JSON解析错误
当我使用相同的JavaScript在浏览器的控制台，我可以得到的数据出来，但是当它是由CRM形式执行我得到一个错误：
SyntaxError: Unexpected end of JSON input at JSON.parse()
的代码是：
var pricelevelid = Xrm.Page.getAttribute("sg_pricelistid").getValue()[0].id;
pricelevelid = pricelevelid.replace(/[{}]/g, "");
var productdata = Xrm.Page.getAttribute("sg_productid").getValue();
if (productdata != null)
{
console.log("going into productdata loop");
productid = productdata[0].id;
productid = productid.replace(/[{}]/g, "");
var req = new XMLHttpRequest();
req.open("GET", Xrm.Page.context.getClientUrl() + "/api/data/v8.0/productpricelevels?$select=amount,_pricelevelid_value,_productid_value,productpricelevelid&$filter=_pricelevelid_value eq " + pricelevelid + " and _productid_value eq " + productid + "", true);
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.onreadystatechange = function() {
if (this.readyState === 4) {
req.onreadystatechange = null;
if (this.status === 200) {
var results = JSON.parse(this.response);
for (var i = 0; i < results.value.length; i++) {
var amount = results.value[i]["amount"];
var amount_formatted = results.value[i]["[email protected]"];
}
} else {
Xrm.Utility.alertDialog(this.statusText);
}
}
};
req.send();
data = JSON.parse(req.responseText);
var amount = data.value[0]["amount"];
Xrm.Page.getAttribute("sg_unitprice").setValue(amount);
}