Using Node Express to fill out forms with AJAX

Is it possible to update a specific section of a webpage using AJAX without having to refresh the entire page? If so, how can this be achieved correctly?

//Get Book
router.get('/form/:id', (req, res) => { 
  Book.findOne({
    _id: req.params.id
  })
    .then(books=> {
      res.send(books)
      });
    });
});

I would like to include a title via AJAX.

<div class="form-group">
     <b class="titleclass">Title:</b>
     <input type="text" class="form-control" name="title">
</div>

Here is my solution:

//Get Book
router.get('/form/', (req, res) => { 
  var x="this is title";
  res.send(x)
});

JavaScript:

$(".test").click(function () {       
    $.get("/form/", function (data, status) {
        alert(data); //does not trigger               
    })
});

Answer №1

According to the jQuery documentation, the callback function of the $.get method is only executed if the request is successful. It is important to check for any potential CORS issues that may be affecting your application. If needed, you can add the following headers to your response:

res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

Answer №2

After reviewing your code, a few potential issues come to mind:

  1. Make sure you include an :id parameter in your GET request.
  2. Remove the trailing slash from the end of /form/.
  3. Ensure that your response is res.json({books: books});.
  4. If not requested from the same server, consider enabling CORS.

I believe implementing these changes will help resolve the issues you are encountering.

Answer №3

To send a title using Ajax, you should ensure to use "return false" to prevent the default behavior in the event handler. In this case, we are not dealing with an actual form element but simulating one. Here is the edited code snippet:

$(.test).click(function(){//fetching title with Ajax from an HTML file
$.get("/form", function(data, status){
    alert(data)
})return false;});

router.get('/form', (req, res) => { var x="this is title"; res.send(x)});
app.use(function(req, res) {//handling cross-origin requests
 res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept"); });

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