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I have browsed StackOverflow and found a couple questions/answers that are close but not exact for my situation. I am following this example:
.shtml
And my JavaScript code is like this:
var cityList = document.selectionForm.cityListBox;
var cities = new Array();
cities[0] = "";
cities[1] = ["Eugene|eugeneValue", "Portland|portlandValue", "Salem|salemValue"];
cities[2] = ["Bellingham|bellinghamValue", "Onalaska|onalaskaValue", "Seattle| seattleValue"];
function updateCities(cityGroup)
{
cityList.options.length = 0;
if (cityGroup > 0)
{
for (i = 0; i < cities[cityGroup].length; i++)
{
cityList.options[cityList.options.length] = new Option(cities[cityGroup][i].split("|")[0], cities[cityGroup][i].split("|")[1]);
}
}
}
And my HTML code like this:
<form name="selectionForm">
<select name="stateListBox" size="3" style="width: 150px" onchange="updateCities(this.selectedIndex);">
<option selected>Select a State >></option>
<option value="oregon">Oregon</option>
<option value="washington">Washington</option>
</select>
<select name="cityListBox" size="3" style="width: 150px" onclick="alert(this.options[this.options.selectedIndex].value);">
</select>
</form>
As far as I can tell, this should work as described by the link above. I have had great experiences with the JavaScript Kit website, but this time I think I am missing something.
When I actually publish this to the page, I can click the states but nothing appears in the city box, as is expected.
Can anyone see the problem here?
Any help is appreciated.
PS - I apologize if there is a double post that I missed. Any references are also greatly appreciated.
I have browsed StackOverflow and found a couple questions/answers that are close but not exact for my situation. I am following this example:
http://www.javascriptkit./javatutors/selectcontent2.shtml
And my JavaScript code is like this:
var cityList = document.selectionForm.cityListBox;
var cities = new Array();
cities[0] = "";
cities[1] = ["Eugene|eugeneValue", "Portland|portlandValue", "Salem|salemValue"];
cities[2] = ["Bellingham|bellinghamValue", "Onalaska|onalaskaValue", "Seattle| seattleValue"];
function updateCities(cityGroup)
{
cityList.options.length = 0;
if (cityGroup > 0)
{
for (i = 0; i < cities[cityGroup].length; i++)
{
cityList.options[cityList.options.length] = new Option(cities[cityGroup][i].split("|")[0], cities[cityGroup][i].split("|")[1]);
}
}
}
And my HTML code like this:
<form name="selectionForm">
<select name="stateListBox" size="3" style="width: 150px" onchange="updateCities(this.selectedIndex);">
<option selected>Select a State >></option>
<option value="oregon">Oregon</option>
<option value="washington">Washington</option>
</select>
<select name="cityListBox" size="3" style="width: 150px" onclick="alert(this.options[this.options.selectedIndex].value);">
</select>
</form>
As far as I can tell, this should work as described by the link above. I have had great experiences with the JavaScript Kit website, but this time I think I am missing something.
When I actually publish this to the page, I can click the states but nothing appears in the city box, as is expected.
Can anyone see the problem here?
Any help is appreciated.
PS - I apologize if there is a double post that I missed. Any references are also greatly appreciated.
Share Improve this question edited May 6, 2011 at 20:18 nicorellius asked May 6, 2011 at 20:06 nicorelliusnicorellius 4,0535 gold badges52 silver badges81 bronze badges 3- I am getting a "updateCities is not defined" error on jsFiddle investigating... – Chad Commented May 6, 2011 at 20:22
- Here is a simple working jQuery example (jsfiddle/Jaybles/FYVvP) – Dutchie432 Commented May 6, 2011 at 20:23
-
@Chad, the error is thrown in jsFiddle because jsFiddle puts the script in a function and loads it on page load. Since
updateCities
is in a function, it has a local scope leading to error – sv_in Commented May 6, 2011 at 20:29
3 Answers
Reset to default 5A more readable solution using jQuery, that doesn't require you to keep the two lists in sync (the states and cities are defined in a javascript data structure)
HTML:
<form name="selectionForm">
<select name="states" id="states" size="3" style="width: 150px">
<option selected>Select a State >></option>
</select>
<select name="cities" id="cities" size="3" style="width: 150px"></select>
</form>
javascript:
jQuery(function($) {
initCities();
function initCities() {
var statesAndCities = {
'Oregon': ['Eugene', 'Portland', 'Salem'],
'Washington': ['Bellingham', 'Onalaska', 'Seattle']
};
//populate states
$.each(statesAndCities,function(k,v){$('#states').append('<option>' + k + '</option>');});
//populate cities
$('#states').change(function(){
var $cities = $('#cities');
$cities.html("");
var cities = statesAndCities[$(this).val()];
$.each(cities,function(k,v){$cities.append('<option>' + v + '</option>');});
});
}
});
demo:
http://jsfiddle/82frv/1/
in the for loop in updateCities
, the statement starts with citylist.options
change citylist
to cityList
(Capital L)
Will work then.
Just two things:
You need document.forms.selectionForm, the forms are within that collection
The way the script is written, it must be placed in the page after the tag, because it tries to access it immediately
No other change is needed.
本文标签: javascriptCreating a 2 Level Interdependent Select ListStack Overflow
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