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“var” or no “var” in JavaScript's “for-in” loop?
... following.
function f (){
for (i=0; i<5; i++);
}
var i = 2;
f ();
alert (i); //i == 5. i should be 2
If you write var i in the for loop the alert shows 2.
JavaScript Scoping and Hoisting
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Insert code into the page context using a content script
... work in Chrome 40-, use:
var actualCode = ['/* Code here. Example: */' + 'alert(0);',
'// Beware! This array have to be joined',
'// using a newline. Otherwise, missing semicolons',
'// or single-line comments (//) will mess up your',
...
jQuery `.is(“:visible”)` not working in Chrome
...ction check(id) {
if (isVisible(id)) {
alert('visible: true');
} else {
alert('visible: false');
}
return false;
}
</script>
<style type="text/css">
...
jQuery - hashchange event
.../window.onhashchange
cite as follow:
if ("onhashchange" in window) {
alert("The browser supports the hashchange event!");
}
function locationHashChanged() {
if (location.hash === "#somecoolfeature") {
somecoolfeature();
}
}
window.onhashchange = locationHashChanged;
...
How to show a dialog to confirm that the user wishes to exit an Android Activity?
....0+ this would look like:
@Override
public void onBackPressed() {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Closing Activity")
.setMessage("Are you sure you want to close this activity?")
.setPositiveButton("Yes", new D...
JavaScript closures vs. anonymous functions
...ssage = "This is the control. You should be able to see this message being alerted.";
regularFunction();
function regularFunction() {
alert(eval("message"));
}
}
We know that both lexicalScope and regularFunction aren't closures from the above definition.
When we...
Extract a number from a string (JavaScript)
...teristic:561613213213";
var numb = txt.match(/\d/g);
numb = numb.join("");
alert (numb);
result
1234561613213213
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Creating a system overlay window (always on top)
...our manifest:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
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Javascript Confirm popup Yes, No button instead of OK and Cancel
...
you can use sweetalert.
import into your HTML:
<script src="https://cdn.jsdelivr.net/npm/sweetalert2@8"></script>
and to fire the alert:
Swal.fire({
title: 'Do you want to do this?',
text: "You won't be able to revert thi...
How do I catch an Ajax query post error?
... data: "name=John&location=Boston",
success: function(msg){
alert( "Data Saved: " + msg );
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert("some error");
}
});
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