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How to communicate between iframe and the parent site?
...ame:
window.onmessage = function(e){
if (e.data == 'hello') {
alert('It works!');
}
};
If you are posting message from iframe to parent window
window.top.postMessage('hello', '*')
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What is the difference between substr and substring?
...s parameters as (from, length).
Update: MDN considers substr legacy.
alert("abc".substr(1,2)); // returns "bc"
alert("abc".substring(1,2)); // returns "b"
You can remember substring takes indices, as does yet another string extraction method, slice.
When starting from 0 you can use either m...
How do you get a Golang program to print the line number of the error it just called?
... While the answer already given fixes the problem neatly, your solution alerted me for the existence of something awesome — the runtime package! Lovely stuff :) golang.org/pkg/runtime
– Gwyneth Llewelyn
Jun 12 '17 at 17:54
...
Run JavaScript code on window close or page refresh?
...unload.
window.onbeforeunload = confirmExit;
function confirmExit(){
alert("confirm exit is being called");
return false;
}
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Cross-browser window resize event - JavaScript / jQuery
... in the following example, inspired by this:
function doSomething() {
alert("I'm done resizing for the moment");
};
var resizeTimer;
$(window).resize(function() {
clearTimeout(resizeTimer);
resizeTimer = setTimeout(doSomething, 100);
});
...
How to get jQuery dropdown value onchange event
...on(){
$("#status").change(function(){
var status = this.value;
alert(status);
if(status=="1")
$("#icon_class, #background_class").hide();// hide multiple sections
});
});
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Accessing Session Using ASP.NET Web API
...ssion:
$.getJSON(apiBaseUrl + '/MyApi')
.done(function (data) {
alert('session data received: ' + data.whatever);
})
);
WebForms
Do the above but change the WebApiConfig.Register function to take a RouteCollection instead:
public static void Register(RouteCollection routes)
{...
How to check whether an object is a date?
...myRealDate = new Date();
if (myRealDate.typof('Date')) { /* do things */ }
alert( myDate.typof() ); //=> String
[Edit march 2013] based on progressing insight this is a better method:
Object.prototype.is = function() {
var test = arguments.length ? [].slice.call(arguments) : null
...
Formatting a number with exactly two decimals in JavaScript
...mply use the toFixed method:
(10.8).toFixed(2); // "10.80"
var num = 2.4;
alert(num.toFixed(2)); // "2.40"
Note that toFixed() returns a string.
IMPORTANT: Note that toFixed does not round 90% of the time, it will return the rounded value, but for many cases, it doesn't work.
For instance:
2.005.t...
Maximum size of an Array in Javascript
..., 7, 8];
if (longArray.length >= 6) {
longArray.length = 3;
}
alert(longArray); //1, 2, 3
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