[closed] encodeArray with isArray
March 13th, 2010Further info here (http://extjs.com/forum/showthread.php?t=32252): http://extjs.com/forum/showthread.php?t=32252
I was going to just go silent into the night thinking that the problem was all on me, but after further reflection I thought maybe the ext code could be tweaked.
My thought is this:
While encoding to json, ext classifies my 'array-like' object as an array. But then when it comes time to encodeArray, the length test fails and the length of my (array-like) object is zero, as a result the zero length 'array' (as ext classified it) will encode to an empty array "".
Seems like there's a few plausible modifications that would enable it to still work for example:
if (isArray(o) && o.length) {
//encode it like an array
}
...
else {
//if other classifications fail and it smells like an object
//encode it like an object
}
this.encode = function(o){
if(typeof o == "undefined" o === null){
return "null";
}else if(Ext.isArray(o)){
return encodeArray(o);
}else if(Ext.isDate(o)){
return encodeDate(o);
}else if(typeof o == "string"){
return encodeString(o);
}else if(typeof o == "number"){
return isFinite(o) ? String(o) : "null";
}else if(typeof o == "boolean"){
return String(o);
}else {//should end up here not in encodeArray if using an 'array-like' object
var a = ["{"], b, i, v;
for (i in o) {
if(!useHasOwn o.hasOwnProperty(i)) {
v = o[i];
switch (typeof v) {
case "undefined":
case "function":
case "unknown":
break;
default:
if(b){
a.push(',');
}
a.push(this.encode(i), ":",
v === null ? "null" : this.encode(v));
b = true;
}
}
}
a.push("}");
return a.join("");
}
};
var encodeArray = function(o){
var a = ["["], b, i, l = o.length, v;
for (i = 0; i < l; i += 1) {
v = o[i];
switch (typeof v) {
case "undefined":
case "function":
case "unknown":
break;
default:
if (b) {
a.push(',');
}
a.push(v === null ? "null" : Ext.util.JSON.encode(v));
b = true;
}
}
a.push("]");
return a.join("");
};
isArray: function(v){
return v&&typeof v.pop=="function" &&v.length//maybe test for length property?}
If you have an array-like clone that you would like to have encoded as an object, you may wish to add some kind of flag to it's prototype (e.g. preventArray: true) and then override the isArray function to check for your flag.
I see that this:
var a;
a =
a['something']=3;
a['another']=5
a.length;//0 instead of undefined
I thought that last line might evaluate to undefined. So like you say should seek other means.
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