How to retrieve json data using java script using web API url in ASP.NET?

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Sir

I have an issue with below code. 
Result not showing as json data when clicking "Submit Button" which calls java Function


Example Doc no :  900 ,  484 , 923 , 865

Please advice me 

Thank you

Maideen

Below is my code

What I have tried:

ASP.NET

<form id="form1" runat="server">
       <div>
           <asp:Label ID="Label1" runat="server" Text="Enter Receipt No"></asp:Label>
           <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

       </div>
       <div>
           <asp:Button ID="btnAll" runat="server" Text="All" />
           <asp:Button ID="btnDocno" runat="server" Text="DocNo" />
            <asp:Button ID="BtnSubmit" runat="server" Text="Submit" OnClientClick="GetDetails()" />
       </div>
       <div>

JavaScript

<script type="text/javascript">
        function GetDetails(varCnNo) {
            var varCnNo = document.getElementById('<%= TextBox1.ClientId %>').value;
            alert(varCnNo);
            return true;
            const url = new URL("http://courier.silsnetwork.com/WebService.asmx/GetBizTrak_DOCNO?strDocNo=" & varCnNo);
            let headers = {
                "Content-Type": "application/json",
                "Accept": "application/json"
            };

            let body = {
                "docno": varCnNo //
            }
            fetch(url, {
                method: "POST",
                headers: headers,
                body: body
            })
                .then(response => response.json())
                .then(json => console.log(json));
        }
    </script>

Posted 17-Jun-21 22:46pm

Maideen Abdul Kader

Updated 17-Jun-21 23:42pm

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Chris Copeland · Answer 1 · 2021-06-17T23:42:00

If this is the code you're using then straight away the HTTP request isn't going to work because you're returning from the method before it can even run:

JavaScript

alert(varCnNo);
return true;

If you get rid of the return statement then the request can process. Otherwise, have you tried also subscribing to the catch() of the Promise<> to handle when errors happen? Using the catch()[^] method can provide you a means to report errors.

Also, be aware some websites have origin restrictions for requests, so if you're running this locally or from another website then the request could be blocked for not originating from the same domain.