Retrieve data via AJAX using a combination of JavaScript and ASP

Question

Retrieve data via AJAX using a combination of JavaScript and ASP

Can someone help me figure out how to retrieve the value of value1 on my server-side ASP using Javascript? I am using this Ajax code but unsure of how to do it.

In my serverside code, I would like to have something like <% var newdata = value1 (which is the one from the serverside - which was sent here) %>

Please Help! Thank you in advance!

I know it's possible with PHP, but can someone guide me on how to do it with Javascript?

<script>
function ajaxNow(_data)
{
  var xmlHttp;
  try
  {
    /* Firefox, Opera 8.0+, Safari */
    xmlHttp=new XMLHttpRequest();
  }
  catch (e)
  {
    /* newer IE */
    try
    {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e)
    {
      /* older IE */
      try
      {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch (e)
      {
        alert("Your browser is old and does not have AJAX support!");
        return false;
      }
    }
  }
  xmlHttp.onreadystatechange=function()
  {
    if(xmlHttp.readyState==4)
    {
      /* this puts the value into an alert */
      alert("Value read is: "+xmlHttp.responseText);
    }
  }
  xmlHttp.open("GET","ajax_file.asp?value1="+_data,true);
  xmlHttp.send(null);
}
</script>

javascript ajax asp-classic

Answer 1

Answer №1

It's important to note that client-side Javascript is unable to directly access server-based databases, for security reasons. To achieve what you're trying to do, I recommend implementing an ASP script that can execute the query using VBA, C#, or another appropriate language. From there, you can process the results in your client-side ajax call as usual.

Answer 2

It's important to note that client-side Javascript is unable to directly access server-based databases, for security reasons. To achieve what you're trying to do, I recommend implementing an ASP script that can execute the query using VBA, C#, or another appropriate language. From there, you can process the results in your client-side ajax call as usual.

Answer 3

Answer №2

To ensure secure transmission, make sure to URL encode the variables _data and nbquestions. Use Request.QueryString("param1") to decode them when needed.

For JavaScript URLEncode:

encodeURIComponent(_data);

You can also utilize Server.URLEncode() methods with VB script for encoding.

Answer 4

To ensure secure transmission, make sure to URL encode the variables _data and nbquestions. Use Request.QueryString("param1") to decode them when needed.

For JavaScript URLEncode:

encodeURIComponent(_data);

You can also utilize Server.URLEncode() methods with VB script for encoding.

Answer 5

Answer №3

The correct way to send xmlHttp

It overlooks the need to check for a status of 200 before processing the data.
There is a failure to properly encode the data for URL safety.

My recommendation would be to utilize a library for handling XHR operations, rather than attempting to create your own solution from scratch. Check out Microjs which offers a variety of small libraries if you are not using one of the bigger ones like YUI or jQuery.

How can I extract values on the server-side using Javascript?

The data will be in query string format, accessible through Request.QueryString.

Answer 6

The correct way to send xmlHttp

It overlooks the need to check for a status of 200 before processing the data.
There is a failure to properly encode the data for URL safety.

My recommendation would be to utilize a library for handling XHR operations, rather than attempting to create your own solution from scratch. Check out Microjs which offers a variety of small libraries if you are not using one of the bigger ones like YUI or jQuery.

How can I extract values on the server-side using Javascript?

The data will be in query string format, accessible through Request.QueryString.

Answer 7

Answer №4

When an AJAX request is made, the server-side script processes the request and retrieves the required data from the database before sending it back to the client side.

There are numerous tutorials available that demonstrate how to set up this functionality. It's essential to prioritize securing your script to prevent potential exploitation.

Answer 8

When an AJAX request is made, the server-side script processes the request and retrieves the required data from the database before sending it back to the client side.

There are numerous tutorials available that demonstrate how to set up this functionality. It's essential to prioritize securing your script to prevent potential exploitation.

Answer 9

Answer №5

If you want your ASP page to output results in JSON format that can be directly read via the XMLHttpRequest Object for further processing, consider the following approach:

Here is an example of JSON format:

var myJSONObject = {"bindings": [
        {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},
        {"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},
        {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
    ]
};

You can then utilize native parsers available in web browsers or use eval() (not recommended) to parse the data generated by your ASP page and incorporate it into your client-side JavaScript code.

For more information on JSON basics, please refer to this resource.

JSON support in various browsers:

Internet Explorer 8+
Mozilla Firefox/Sea Monkey
Compatible with Opera, Chrome, Safari as well

Answer 10

If you want your ASP page to output results in JSON format that can be directly read via the XMLHttpRequest Object for further processing, consider the following approach:

Here is an example of JSON format:

var myJSONObject = {"bindings": [
        {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},
        {"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},
        {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
    ]
};

You can then utilize native parsers available in web browsers or use eval() (not recommended) to parse the data generated by your ASP page and incorporate it into your client-side JavaScript code.

For more information on JSON basics, please refer to this resource.

JSON support in various browsers:

Internet Explorer 8+
Mozilla Firefox/Sea Monkey
Compatible with Opera, Chrome, Safari as well

Answer 11

Answer №6

//(javascript, ajax = xmlHttp)

if you have an array as your response text, you can utilize the following code snippet:

var myArray = eval(xmlHttp.responseText);

If your response is just plain text, this code will come in handy:

var value = xmlHttp.responseText

Here's another approach. The following template can be used with jQuery to handle responses:

html part:

<div id="willupdate"></div>
<div id="willupdate2"></div>

JQuery part:

 $(document).ready(function() {

getValue("serverurl", updateName)
getValue("serverurl", updateSurName)
 });

function updateName(name){
 $("#willupdate").text(name)
}


function updateSurName(name){
 $("#willupdate2").text(name)
}

function updateSurName(name){
 $("#willupdate").text(name)
}

function getValue(url,opt_onRecieved){
    if( !url || url == ""){
        alert("request url error");
        return;
    }

    $.ajax({
        type:"POST",
        url: url,
        dataType:"json",
        success: function(data){
            opt_onRecieved(data);

        }
    });
}

Answer 12

//(javascript, ajax = xmlHttp)

if you have an array as your response text, you can utilize the following code snippet:

var myArray = eval(xmlHttp.responseText);

If your response is just plain text, this code will come in handy:

var value = xmlHttp.responseText

Here's another approach. The following template can be used with jQuery to handle responses:

html part:

<div id="willupdate"></div>
<div id="willupdate2"></div>

JQuery part:

 $(document).ready(function() {

getValue("serverurl", updateName)
getValue("serverurl", updateSurName)
 });

function updateName(name){
 $("#willupdate").text(name)
}


function updateSurName(name){
 $("#willupdate2").text(name)
}

function updateSurName(name){
 $("#willupdate").text(name)
}

function getValue(url,opt_onRecieved){
    if( !url || url == ""){
        alert("request url error");
        return;
    }

    $.ajax({
        type:"POST",
        url: url,
        dataType:"json",
        success: function(data){
            opt_onRecieved(data);

        }
    });
}

Answer 13

Answer №7

Upon successful completion of your Ajax request, the query string variables will be stored in the QueryString Collection of the Request Object.

Here is an example of how it could be implemented on the server side:

<% var newdata = Request.QueryString("value1"); %>

Answer 14

Upon successful completion of your Ajax request, the query string variables will be stored in the QueryString Collection of the Request Object.

Here is an example of how it could be implemented on the server side:

<% var newdata = Request.QueryString("value1"); %>

Answer 15

Answer №8

Check out this fantastic tutorial on AJAX. It covers everything you need to know. https://developer.mozilla.org/en/AJAX/Getting_Started

Don't forget to add a double quote:

xmlHttp.open("post","CmsAjax.asp",true)

Here's how to retrieve the data:

/* This will display the value in an alert */
alert(xmlHttp.responseText);

Answer 16

Check out this fantastic tutorial on AJAX. It covers everything you need to know. https://developer.mozilla.org/en/AJAX/Getting_Started

Don't forget to add a double quote:

xmlHttp.open("post","CmsAjax.asp",true)

Here's how to retrieve the data:

/* This will display the value in an alert */
alert(xmlHttp.responseText);

Answer 17

Answer №9

To ensure secure data transmission, it is recommended to encode the data on the server and decode it on the client side. One popular method for achieving this is by using JSON-RPC.

Here are a few helpful links:

Check out the Official JSON-RPC Website

Read the Wikipedia Article about JSON-RPC

Explore different Implementations of JSON-RPC Service in various languages

If you only have one value to encode, you can simply use JSON in ASP to encode it and then decode it in JavaScript like so:

var array = JSON.parse(xmlHttp.responseText);

Answer 18

To ensure secure data transmission, it is recommended to encode the data on the server and decode it on the client side. One popular method for achieving this is by using JSON-RPC.

Here are a few helpful links:

Check out the Official JSON-RPC Website

Read the Wikipedia Article about JSON-RPC

Explore different Implementations of JSON-RPC Service in various languages

If you only have one value to encode, you can simply use JSON in ASP to encode it and then decode it in JavaScript like so:

var array = JSON.parse(xmlHttp.responseText);

Retrieve data via AJAX using a combination of JavaScript and ASP

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

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