I have a three dropdown and the value will be dynamically changed using 
ajax. It's working fine but something is wrong. In second dropdown 
(id="lead_name"), I specify jQuery('#model_name') but it's 
actually jQuery('#leadl_name') but then when the value for the second drop 
changed, the value disappear from the second and third. When I keep the 
current way (which is wrong name) it's working as expected.... Do you guys 
know what's wrong?

This is my view

<form enctype="multipart/form-data" action="{{URL()}}" method="post">
                <tr>
                <td><select name='model_name' onchange="jQuery('#model_name'
).empty(); 
                    ajax('lead_ajax', ['model_name'], 'lead_name');">
                    {{for model in models:}}
                        <option value="{{=model.Name}}" 
                        {{=" selected='selected'" if str(model.Name)=
=request.vars.model_name else ""}}>
                        {{=model.Name}}
                        </option>
                    {{pass}}
                </select></td>
                <td><select id='lead_name' name='lead_name' onchange="jQuery
('#model_name').empty(); 
                    ajax('block_ajax', ['lead_name'], 'block_name');">
                    {{for lead in leads:}}
                        <option value="{{=lead.Name}}" 
                        {{=" selected='selected'" if str(lead.Name)=
=request.vars.lead_name else ""}}>
                        {{=lead.Name}}
                        </option>
                    {{pass}}
                </select></td>
                 <td><select id='block_name' name='block_name'>
                    {{for block in blocks:}}
                        <option value="{{=block.Name}}" 
                        {{=" selected='selected'" if str(block.Name)=
=request.vars.block_name else ""}}>
                        {{=block.Name}}
                        </option>
                    {{pass}}
                </select></td>
                    <td></td>
                    <td></td>
                <td><input type="submit" value='Submit'></td>
                </tr>
            </form>

My controller

def index():
    response.title='KR Quick Delivery Service'
    
    if request.vars.model_name: 
        lists = db((db.KR_Product.Model==request.vars.model_name) & (db.
KR_Product.Lead==request.vars.lead_name) & (db.KR_Product.Block==request.
vars.block_name)).select(db.KR_Product.ALL)
    else:
        lists=''
    models = db().select(db.KR_Model.ALL)
    leads = db(db.KR_Lead.ModelName == '20').select(db.KR_Lead.ALL)
    blocks = db(db.KR_Block.LeadName == '01').select(db.KR_Block.ALL)
        
    return dict(lists=lists,models=models,leads=leads,blocks=blocks)
    
def lead_ajax():
    leads = db(db.KR_Lead.ModelName==request.vars.model_name).select(db.
KR_Lead.ALL)
    result = ''
    for lead in leads:
        result += "<option value='" + lead.Name + "'>" + lead.Name + 
"</option>"  
    return XML(result)
    
def block_ajax():
    blocks = db(db.KR_Block.LeadName==request.vars.lead_name).select(db.
KR_Block.ALL)
    result = ''
    for block in blocks:
        result += "<option value='" + block.Name + "'>" + block.Name + 
"</option>"  
    return XML(result)



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