HTTP request question

[david arnold]

hi,

I have the javascript code like this:
function doSendRequest(requestAction, synchronousType, parameter, callBackFunctionName) { httpRequest= getHTTPRequest(); httpRequest.onreadystatechange = callBackFunctionName; //this does not work httpRequest.onreadystatechange = handleResponse; //this works httpRequest.open("POST", requestAction, synchronousType); httpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); httpRequest.send(parameter); } ................... doSendRequest("scan.do", true, logParameter, 'handleResponse'); function handleResponse {.....}

I do not know why it does not work in case 1, I tried to make different ajax calls using this same doSentRequest method, which I need transfer the call back function name.

Thanks.

[Bear Bibeault]

If you do not have a function named callBackFunctionName why would you expect it to work? There's certainly got to be much more to this question than you've posted.

[david arnold]

Thank you Bear, i thought " handleResponse " was transferred as "scan.do" does. My mind does not work well sometimes these days (worked 14 hours yesterday), i have to finish a project with a very tight schedule, and i have many things to learn.

[Bear Bibeault]

No. There's no magic just because this is Ajax. All the normal rules of JavaScript still apply.

If you want what you have there to work, you need to pass a reference to the callback function to your doSendRequest function, not a string. A string is a string and can't magically become a function. (The string could be used to look up the function definition, but that's another show.)

But the more basic question I'd ask is: why are you doing your own Ajax rather than letting jQuery or Dojo handle it?

[david arnold]

Thank you Bear for the info.

One reason I did not choose jquery/dojo is license conern. The other reason is that I took a look at jquery/dojo, and feels that the tight time i have do not allow me to learn/use it, maybe i am wrong. Anyway, thanks for help!

[Bear Bibeault]

david arnold wrote:One reason I did not choose jquery/dojo is license conern.

What license concern? There is no license concern.

i have do not allow me to learn/use it

Do you have time to deal with all the nuances and cross-browser issues that Ajax has on your own?

[david arnold]

from my understanding, if I use GPL license in a project A, person A buy this project from me and he can use it, but he can not sell it to others, right?

I do not know much about Ajax cross browser issue, and i have not got chance to test cross browser so far, i only have simple http request browser check. Any big issue i need to know?

Thanks.

[Bear Bibeault]

david arnold wrote:from my understanding, if I use GPL license in a project A, person A buy this project from me and he can use it, but he can not sell it to others, right?

And which product are you concerned about being released under a GPL license?

[Eric Pascarello]

You are thinking that you can assign multiple function calls.

httpRequest.onreadystatechange = callBackFunctionName;   //this line gets replaced by the next line
httpRequest.onreadystatechange = handleResponse;         //this works 

That code above is the same thing as

var foo = 1;
foo = 2;
alert(foo);

Would you expect to see both 1 and 2?

Eric