id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
7985	Cannot use the same field to prepopulate multiple fields	Fraser Nevett	Rami Kassab	"Take, for example, this !ModelAdmin:

{{{
#!python
class ExampleAdmin(admin.ModelAdmin):
    prepopulated_fields = {
       ""slug"": (""name"",),
       ""full_slug"": (""name"", ""category""),
       }
}}}

It results in the following Javascript being generated in the template:

{{{
#!javascript
    document.getElementById(""id_full_slug"").onchange = function() { this._changed = true; };
    
    document.getElementById(""id_name"").onkeyup = function() {
        var e = document.getElementById(""id_full_slug"");
        if (!e._changed) { e.value = URLify(document.getElementById(""id_name"").value + ' ' + document.getElementById(""id_category"").value, 50); }
    }
    
    document.getElementById(""id_category"").onkeyup = function() {
        var e = document.getElementById(""id_full_slug"");
        if (!e._changed) { e.value = URLify(document.getElementById(""id_name"").value + ' ' + document.getElementById(""id_category"").value, 50); }
    }
    

    document.getElementById(""id_slug"").onchange = function() { this._changed = true; };
    
    document.getElementById(""id_name"").onkeyup = function() {
        var e = document.getElementById(""id_slug"");
        if (!e._changed) { e.value = URLify(document.getElementById(""id_name"").value, 50); }
    }
}}}

The cause of the problem is the event listeners being attached by simply setting the `onkeyup` property. This means the second assignment overwrites the first one.

To attach multiple event listeners, the `addEvent` function defined in `core.js` should be used."		closed	contrib.admin	dev		duplicate	aug22sprint		Accepted	1	0	0	0	0	0