Javascript – Call a code behind function from javascript in aspx

ccode-behindjavascript

I have a page where a javascript will be triggered when the user closes the browser tabs / browser window. Language is in c# thanks.

im using window.onbeforeunload, something along the line like this:

<script type="text/javascript">


    window.onbeforeunload = myFunction;


function myFunction()
{
    //call my function here
}

the code behind function will be a simple function for now, so no input parameters or return value are needed. So i'll just like to know how to call my function (eg: public void callMyFunction())

Best Answer

There are variety mechanisms to call your code-behind function(s). You could use an Ajax Call, Page Methods, ASP.NET Client Callbacks, or even trigger a code-behind handler using an invisible ASP.NET button.

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setInterval() returns an interval ID, which you can pass to clearInterval():

var refreshIntervalId = setInterval(fname, 10000);

/* later */
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See the docs for setInterval() and clearInterval().

Javascript – Remove properties from objects (JavaScript)

To remove a property from an object (mutating the object), you can do it like this:

delete myObject.regex;
// or,
delete myObject['regex'];
// or,
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delete myObject[prop];

Demo

var myObject = {
    "ircEvent": "PRIVMSG",
    "method": "newURI",
    "regex": "^http://.*"
};
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console.log(myObject);

For anyone interested in reading more about it, Stack Overflow user kangax has written an incredibly in-depth blog post about the delete statement on their blog, Understanding delete. It is highly recommended.

If you'd like a new object with all the keys of the original except some, you could use the destructuring.

Demo

let myObject = {
  "ircEvent": "PRIVMSG",
  "method": "newURI",
  "regex": "^http://.*"
};

const {regex, ...newObj} = myObject;

console.log(newObj);   // has no 'regex' key
console.log(myObject); // remains unchanged

Best Answer

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