javascript string to variable

Question

I am receiving a JSON string from an ajax call and would like to convert a value to a predefined variable:

var predefined = \"hello world\";
var foo = {\"msg         


        

Answer 1

How about this -- just use the message inline on success and don't even bother to make it part of the JSON. On an error, do include the entire message and use it directly. Also, I'd have your server return something like:

{ "status": true }

or

{ "status": false, "msg": "The mail server is down." }

Then you can just evaluate it as a boolean without comparing it to a string value.

$.ajax({
    url: "ajax-share-email.php",
    type: "POST", 
    dataType: "json", 
    data: {},
    success: function(data) {
        if (data.status) {
            msg.text('Your email has been sent successfully!').addClass("email-msg-success");                   
        } else {
            msg.text(data.msg).addClass("email-msg-error");
        }
    }
});

If, and only if, you start reusing your messages for multiple functions, then refactor to a message dictionary and reference it from there. Note your messages object would likely need to be a global variable, or at least in the outer scope of all the functions that use it.

 var messages = {};
 messages.mail_success = 'Your email has been sent successfully!';
 messages.post_success = 'Your data has been updated!';

$.ajax({
    url: "ajax-share-email.php",
    type: "POST", 
    dataType: "json", 
    data: {},
    success: function(data) {
        if (data.status) {
            msg.text(messages.mail_success).addClass("email-msg-success");                   
        } else {
            msg.text(data.msg).addClass("email-msg-error");
        }
    }
});