The page I am working on has a javascript function executed to print parts of the page. For some reason, printing in Safari, causes the window to somehow update. I say somehow, because it does not really refresh as in reload the page, but rather it starts the "rendering" of the page from start, i.e. scroll to top, flash animations start from 0, and so forth. The effect is reproduced by this fiddle: http://jsfiddle.net/fYmnB/ Clicking the print button and finishing or cancelling a print in Safari causes the screen to "go white" for a sec, which in my real website manifests itself as something "like" a reload. While running print button with, let's say, Firefox, just opens and closes the print dialogue without affecting the fiddle page in any way. Is there something with my way of calling the browsers print method that causes this, or how can it be explained - and preferably, avoided? P.S.: On my real site the same occurs with Chrome. In the ex
with jquery you can call $.extend
ReplyDeleteobj1 = {a: 1, b: 2};
obj2 = {a: 4, c: 110};
obj3 = $.extend(obj1, obj2);
obj1 == obj3 == {a: 4, b: 2, c: 110}
(assoc. arrays are objects in js)
look here: http://api.jquery.com/jQuery.extend/
This is how Prototype does it:
ReplyDeleteObject.extend = function(destination, source) {
for (var property in source) {
if (source.hasOwnProperty(property)) {
destination[property] = source[property];
}
}
return destination;
};
called as, for example:
var arr1 = { robert: "bobby", john: "jack" };
var arr2 = { elizabeth: "liz", jennifer: "jen" };
var shortnames = Object.extend(arr1,arr2);
EDIT: added hasOwnProperty() check as correctly pointed out by bucabay in comments
In dojo, the 2-objects/arrays "merge" would be dojo.mixin(destination, source) -- you can also mix multiple sources into one destination, etc -- see the mixin function's reference for details.
ReplyDeleteIn Javascript there is no notion of
ReplyDeleteassociative array, there are objects
The only way to merge two objects is
to loop for their properties and
copy pointers to their values that
are not primitive types and values
for primitive types to another
instance
do you want to overwrite a property if the names are the same but the values are not?
ReplyDeleteAnd do you want to permanently change one of the original objects,
or do you want a new merged object returned?
function mergedObject(obj1, obj2, force){
for(var p in obj1) this[p]= obj1[p];
for(var p in obj2){
if(obj2.hasOwnProperty(p)){
if(force || this[p]=== undefined) this[p]= obj2[p];
else{
n= 2;
while(this[p+n]!== undefined)++n;
this[p+n]= obj2[p];
}
}
}
}
Underscore also has an extend method:
ReplyDeleteCopy all of the properties in the source objects over to the
destination object. It's in-order, so the last source will override
properties of the same name in previous arguments.
_.extend(destination, *sources)
_.extend({name : 'moe'}, {age : 50});
=> {name : 'moe', age : 50}
Yahoo UI (YUI) also has a helper function for this:
ReplyDeletehttp://developer.yahoo.com/yui/examples/yahoo/yahoo_merge.html
YAHOO.namespace('example');
YAHOO.example.set1 = { foo : "foo" };
YAHOO.example.set2 = { foo : "BAR", bar : "bar" };
YAHOO.example.set3 = { foo : "FOO", baz : "BAZ" };
var Ye = YAHOO.example;
var merged = YAHOO.lang.merge(Ye.set1, Ye.set2, Ye.set3);
Keep it simple...
ReplyDeletefunction mergeArray(array1,array2) {
for(item in array1) {
array2[item] = array1[item];
}
return array2;
}