How to format well for an AJAX get or post?

Question

1.00/5 (1 vote)

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I try to consume a Geocoding Service. The URL looks like

https://myURL/GeocodeServer/geocodeAddresses

After launching the Geocoding page, and then pasting the data values into the textbox,

{
  "records": [
{"attributes": {"SingleLine": "CAPH", "OBJECTID" : 1 }} ,
{"attributes": {"SingleLine": "WOPK", "OBJECTID" : 2 }} ]
}

clicking on either [Get] or [Post] button results in the results displayed (either JSON or HTML format).

My next step is to write a JavaScript script that uses an AJAX function to retrieve the results dynamically.
My code is below:

var formData = '{"records": [ {"attributes": {"SingleLine": "CAPH", "OBJECTID" : 1 }}, {"attributes": {"SingleLine": "WOPK", "OBJECTID" : 2 }} ] }';
var url = "https://myURL/GeocodeServer/geocodeAddresses";
$("#searchForm").submit(function (event) {
    $.ajax({
        type: 'POST',
        url: url, 
        data: JSON.stringify(formData),  // formatData since it is formatted in JSON already
        contentType: "application/json; charset=utf-8",
        traditional: true,
        success: function (data, textStatus, jQxhr) {
            var result = data;
        },
        error: function (jqXhr, textStatus, errorThrown) {
            console.log(errorThrown);
        }
    });
}

However, I still get error. How to format well for an AJAX Get or Post? What's wrong in my AJAX code? Thanks if you can help.

What I have tried:

How to format well for an AJAX Get or Post

Posted 18-Jun-21 2:40am

s yu

Updated 20-Oct-21 23:40pm

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Comments

SeeSharp2 18-Jun-21 8:49am

1. What is the error?
2. You do not need to call JSON.stringify. That is meant to stringify an object but formData is already a string.

s yu 18-Jun-21 9:29am

If JSON.stringfy() is removed, still get the same error. The errorThrown = ''.

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Richard Deeming · Answer 1 · 2021-10-20T23:40:00

When the form is submitted, you initiate an AJAX request. But you don't cancel the form submission, so your page unloads and navigates to the form's action instead.

Use event.preventDefault() to stop the form from being submitted so that your AJAX request has a chance to run.

JavaScript

$("#searchForm").submit(function (event) {
    event.preventDefault();
    
    $.ajax({
        type: 'POST',
        url: url, 
        data: formData,
        contentType: "application/json; charset=utf-8",
        traditional: true,
        success: function (data, textStatus, jQxhr) {
            var result = data;
            // Do something with the data here...
        },
        error: function (jqXhr, textStatus, errorThrown) {
            console.error(errorThrown);
        }
    });
}