asked on

passing string from PHP to Javascript using JSON

Hi,
I'm having problems passing a php string variable to javascript using JSON.
I want to check the value of the JSON response in javascript and respond accordingly.
Snippets of my code are as follows:

"close_pdp_process_check" PHP Page

$output =  "yes";

echo json_encode($output,JSON_FORCE_OBJECT);

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receiving Page

$.ajax({
    type: "GET",
    url: "close_pdp_process_check.php",
    dataType: "json",
    success: function(response){
    
    if(response == "yes")
    {
      alert(" The answer was yes");
    }
    return false;
    }

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Is the problem with the IF statement because response would be a JSON object? If so how to I return its value.

Thank you

ASKER CERTIFIED SOLUTION

Ray Paseur

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SOLUTION

leakim971

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Julian Hansen

What is the problem - code runs correctly - see below. Agree with Ray - pointless doing a JSON request for a single string return but I suspect this is just test code and you are probably going to expand to include more complex data.
Either way the code below runs fine for me - what problems are you having?

<!doctype html>
<html>
<head>
<script src="http://code.jquery.com/jquery.js"></script>
<script type="text/javascript">
$(function() {
	$.ajax({
		type: "GET",
		url: "close_pdp_process_check.php",
		dataType: "json",
		success: function(response){
			if(response == "yes") {
				console.log(" The answer was yes");
			}
			return false;
		}                                  
	});
});
</script>
</head>
<body>
Testing
</body>
</html>

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EICT

ASKER

Thank you Ray for your very helpful article. JSON encoding the string on the PHP page was the problem. Thanks also Leakim971 your suggestion about echoing an array also worked. Thanks for the specific example.

Ray Paseur

Thanks for the points. It's a great question, ~Ray

kaufmed

echoing an array

Perhaps just misspoken, but that is an object, not an array in leakim's post. Arrays in Javascript use square brackets = )

Ray Paseur

JSON syntax is in the right sidebar here:
http://json.org/