| | |
Using "variable variables" in Javascript
Please support our JavaScript / DHTML / AJAX advertiser: PostgreSQL or MySQL? Compare and contrast the two most popular open source databases
![]() |
Hi there,
I have a little problem working with JavaScript, I was wondering if i could use some trick to call different variables with a base name. I'll explain it:
var number1 = new Array();
var number2 = new Array();
number1[1] = "one";
number1[2] = "two";
number1[3] = "three";
number2[1] = "four";
number2[2] = "five";
number2[3] = "six";
//can I process that arrays in some way like this?
for(var i=0;i=3;i++) {
document.writeln("number.i[i]");
}
I'm trying to read that array in some "dynamic" way, but WITHOUT using bidimensional arrays, trying to use some kind of "dynamic variables name".
Can this be possible without use bidimensional arrays?
Thanks in advance.
I have a little problem working with JavaScript, I was wondering if i could use some trick to call different variables with a base name. I'll explain it:
var number1 = new Array();
var number2 = new Array();
number1[1] = "one";
number1[2] = "two";
number1[3] = "three";
number2[1] = "four";
number2[2] = "five";
number2[3] = "six";
//can I process that arrays in some way like this?
for(var i=0;i=3;i++) {
document.writeln("number.i[i]");
}
I'm trying to read that array in some "dynamic" way, but WITHOUT using bidimensional arrays, trying to use some kind of "dynamic variables name".
Can this be possible without use bidimensional arrays?
Thanks in advance.
To my knowledge... NO. You could do it with Multidimensional array, but trying to do it the way above would never work (not in javascript, anyway). An option to consider, is to create your own object, with a bunch of properties, and then create an array of those objects (I think you can do that in Javascript). Then you can loop through just 1 array, and access any number of properties of the object. So, you make the object to have, say, a "tag" property. Then you create an array of that object, loop through the array, and access the .tag property. I hope I haven't confused more than I Have helped. If so, let me know, and I'll post an example when I get home.
There are a few ways you can operate using arrays in javascript... firstly, you don't need to be constrained to using integer indexes... all arrays in javascript are simply normal javascript objects...
hence there are a few ways you can assign new values:
array_x[0] = "red";
or
array_x[array_x.length] = "red";
or you can use the attribute methods....
array["x"] = "red";
is the same as
array.x = "red";
this might allow you to index in a manner you wish.... of course if it doesn't, you can always use the eval function....
eval("array_"+identifier+"["+ index + "]");
may be more what you are after... eval will return the value of the given expression... of course, you would be using javascript to evaluate javascript, and I have heard of this having some problems.
hence there are a few ways you can assign new values:
array_x[0] = "red";
or
array_x[array_x.length] = "red";
or you can use the attribute methods....
array["x"] = "red";
is the same as
array.x = "red";
this might allow you to index in a manner you wish.... of course if it doesn't, you can always use the eval function....
eval("array_"+identifier+"["+ index + "]");
may be more what you are after... eval will return the value of the given expression... of course, you would be using javascript to evaluate javascript, and I have heard of this having some problems.
•
•
Join Date: Dec 2008
Posts: 1
Reputation:
Solved Threads: 0
As an alternative to the eval() function, maybe you could try this:
JavaScript / DHTML / AJAX Syntax (Toggle Plain Text)
for(var i=0;i=3;i++) { arrayName = 'number'+i; document.writeln("window[arrayName][i]"); }
![]() |
Similar Threads
- "<SCRIPT SRC>" javascript logon help (JavaScript / DHTML / AJAX)
- variables from javascript in asp.net (ASP.NET)
- javascript variable in jsp session (JSP)
- Problem altering "Hidden" Variable (Java)
Other Threads in the JavaScript / DHTML / AJAX Forum
- Previous Thread: Form fields loaded with AJAX not submitted in IE
- Next Thread: dependent drop down menus
| Thread Tools | Search this Thread |
acid2 ajax ajaxcode ajaxexample ajaxjspservlets array browser bug calendar captchaformproblem cart checkbox child close codes createrange() cursor date debugger decimal dependent disablefirebug dom dropdown editor element embed engine enter events explorer ext file firefox focus form forms frameworks getselection google gxt hiddenvalue highlightedword hint html ie7 ie8 iframe images index internet java javascript javascripthelp2020 jquery jsf jsfile jsp jump libcurl listbox maps masterpage math media menu mp4 object onmouseoutdivproblem onmouseover onreadystatechange parent paypal pdf php position post programming progressbar prototype redirect regex runtime safari scale scriptlets scroll search security shopping size software sql text textarea unicode web windowsxp wysiwyg \n






