Seeking examples of integrating AJAX, d3, and PHP to extract data from a database and create graphs. Any guidance would be appreciated.
I am currently using d3 to generate a force chart based on database information retrieved through AJAX and PHP. I have tried binding the data to a DOM element and using D3.queue, but simple examples combining all these components are hard to come by.
This is how my current AJAX request operates:
$(document).ready(function() {
$('select[name="locations"]').change(function(){
var location = $(this).val();
$.ajax({
type: 'POST',
url: 'dataselect.php',
data: { l_id: location },
success: function (response) {
console.log(response);
},
});
});
});
Although I attempted to pass the JSON to a DOM element, I faced challenges extracting it, and some individuals do not recommend this approach.
The functioning d3 code appears as follows:
d3.json("test.php", function(error, graph) {
if (error) throw error;... Additional d3 code omitted for brevity.
In terms of functionality, test.php and dataselect.php are nearly identical, except dataselect includes a variable specific to the AJAX request which causes issues with d3 integration.
How can d3 effectively "wait" for the data from the AJAX query before executing?
I suspect I need to encapsulate certain actions within functions and sequence them appropriately, but struggling to tie everything together seamlessly.
Apologies for what seems like a straightforward task. Despite researching extensively, I have yet to implement successful solutions.
UPDATE: After exploring the d3.request method, I discovered how to transmit data without AJAX:
d3.selectAll("#onploc")
.on('change', function() {
var location = eval(d3.select(this).property('value'));
console.log(location);//retrieves value property of selected menu item.
d3.json("dataselect.php?l_id="+location,function(error, data) {
console.log(data);//sends location variable to php to retrieve data.
})
});