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What is the difference between a function expression vs declaration in JavaScript? [duplicate]
... called until all declarations are loaded.
Example: Function Expression
alert(foo()); // ERROR! foo wasn't loaded yet
var foo = function() { return 5; }
Example: Function Declaration
alert(foo()); // Alerts 5. Declarations are loaded before any code can run.
function foo() { return 5; }
A...
Trigger change event using jquery
...re's a sample
$('.check').change(function(){
var data= $(this).val();
alert(data);
});
$('.check')
.val('two')
.trigger('change');
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Get value from hidden field using jQuery
...t type="hidden" value="" id='h_v' class='h_v'> Using jQuery I want to alert the user to this value .
7 Answers
...
Checking if a key exists in a JavaScript object?
...
It will return undefined.
var aa = {hello: "world"};
alert( aa["hello"] ); // popup box with "world"
alert( aa["goodbye"] ); // popup box with "undefined"
undefined is a special constant value. So you can say, e.g.
// note the three equal signs so that null wo...
HTTP Content-Type Header and JSON
...ray or object. If you want to see all the data, use console.log instead of alert:
alert(response.text); // Will alert "[object Object]" string
console.log(response.text); // Will log all data objects
If you want to alert the original JSON content as a string, then add single quotation marks ('):
...
How to set breakpoints in inline Javascript in Google Chrome?
...; tags, or in the HTML tag attributes, like this?
<a href="#" onclick="alert('this is inline JS');return false;">Click</a>
Either way, the debugger keyword like this will work:
<a href="#" onclick="debugger; alert('this is inline JS');return false;">Click</a>
N.B. Chro...
How can I convert a string to boolean in JavaScript?
... do:
String.prototype.bool = function() {
return strToBool(this);
};
alert("true".bool());
For those (see the comments) that would like to extend the String object to get this but are worried about enumerability and are worried about clashing with other code that extends the String object:
...
Populate a Razor Section From a Partial
...tial("_PartialScripts")
<script type="text/javascript">
alert("I'm a view script.");
</script>
}
The partial view _Partial.cshtml:
<p>This is the partial.</p>
The partial view _PartialScripts.cshtml with scripts only:
<script type="text/javascript"&g...
How to round up a number in Javascript?
...) / Math.pow(10, rlength);
return newnumber;
}
Call the function as
alert(roundNumber(192.168,2));
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what is difference between success and .done() method of $.ajax
...efore making the request
$.ajax({
url: '...',
success: function(){
alert('AJAX successful');
}
});
// set success action just after starting the request
var jqxhr = $.ajax( "..." )
.done(function() { alert("success"); });
This change is for compatibility with jQuery 1.5's deferred obj...