Get Information Using XMLHttpRequest On Page Load?
Jan 28, 2010
I am currently learning AJAX, and I want to write an simple example program (it is only for practice, it has no real meaning).
The program sends request to to PHP and gets response from it, then it should write the response using message box, all should happen on page load. I wrote the following code:
function init(){
myRequst = new XMLHttpRequest();
var url = "http://localhost/dummy.php";
myRequst.open("GET",url,false);
[Code]....
I don't see any message box when the page loads. When using it after the page loaded with other events (not onLoad), it works and I see the message box with the response.
How can I get the data on page load using XMLHttpRequest?
I have been successfully using the following "myAjax" function to load text file information from the server.
ajax.js:
After I load the text file, I store the text "records" into an array by doing something like this:
Where the '}' character is my record delimiter. It could just as easily be ' ' or ' ' or the like.
Again, I am not having any problems doing it this way as it suits my current needs.
Now the question(s)
1. Does the call to read the text data from the external file always read in the entire contents or can I read one line or delimited record at a time and store it to the array directly without the text storage?
2. If the text is always read completely (my suspicion), can I safely delete the "TextInformation" after I convert to the array format? Is there any memory penalty for doing it this way as the text information can be somewhat lengthly and I don't like the idea of having doubled memory usage when I only need the information in array format anyway?
This is the idea I am considering, but I don't know if there are drawback to this method of if there is a better way to accomplish the task.
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I'm making the Back to Top link into something more complex, and it will require three or four lines of code.
So that I don't have to repeat the code 50 times, and create a burden when I need to edit it, I want to place it in a .js file and call it x. Then below the information for each state I'll simply have:
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<html> <script type = "text/javascript"> function square(form)
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My codes at the moment read:
$recentupdates = mysql_query("SELECT * FROM status NATURAL JOIN users WHERE user_id = users.id ORDER BY status_id DESC LIMIT 0, 5"); $recentnumrows = mysql_num_rows($recentupdates);
[Code]....
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... Firebug request size limit has been reached by Firebug. ...
This is my XHR function:
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