Drop Down Box in Struts - Select Default Value Implementation

[Deepak Lal]

Hi Ranchers,
I have the below Requirement.

I have written the logic for implementation of drop down box in struts using 
<options collection Tag.......>
Example:Drop Down Box has below set of values
City Names: Hong Kong,Singapore,Bangalore,New York,Sydney

The Drop Down Box is displaying the values correctly in my CityName.jsp.
The Requirement is when i have an update implementation to be incorporated,
I need the "City name which is Stored in Database" to be selected by default in the Drop Down box in Struts.

For Example:  In Database:
              City Name
----------------------------------- 
              New York
-----------------------------------

So in my CityName.jsp
----------------------------------------------------------------------------
City Names Drop Down Box should show By Default : New York.
---------------------------------------------------------------------------

how do i implement this requirement in Struts..Please guide and advice me....
Any tag has be used or specified in Struts to implement this..


Thanks and Regards
Deepak Lal

[Ankit Garg]

Look at the select tag, there's a value attribute which lets you choose the option that's to be preselected...

[Deepak Lal]

Hi Ankit,
Thanks for the input.I'm stuck up again

 Value Attribute: The value to compare with for marking an option selected. 

The Above Says that we need a value to be compared for marking an option selected...so how can i implement that part of logic...can you please advice.....???
and the option to be preselected has to be validated against the value fetched from database.....so can you please advice on how to implement this logic in Struts.



Thanks and Regards
Deepak Lal

[Ankit Garg]

This is Struts 1 which I'm not very good at, but suppose the value attribute of the select tag goes like this

<html:select property="country" value="val1">
     //option elements
</html:select>

Now the option which has the value val1 will be selected by default...

[Deepak Lal]

Hi Moderators and Experts in Struts,

Need Help on this issue ::::

                          <html:select property="country" value="val1">
                                    //option elements
                           </html:select> 
              

In the above, you are hardcoding the value attribute, but i need to dynamically set the default selected value of the Struts drop down list into the "value" Attribute.Could you please help me out with this.


Please find my code below....Please help me on how to proceed.

              

                             <html:select property="country" >
                                   <html:options collection="countryvalues" property="id" labelProperty="name"  /> 
                             </html:select>

Thanks and Regards
Deepak Lal

[Deepak Lal]

Hi All,
Please find my detailed requirement...

Requirement: i have 2 drop down list

1st dop down list is having countries --> Australia,India,UK
2nd drop down list is also having countries --> USA,Canada,Brazil

Both the drop down list are being displayed in jsp using logic iterate tag

        <logic iterate id="countryData" name="CountryForm" property="countryData">
                     <bean:define id="countryvalues" name="countryData" property="dropDownList"/>
                                    <html:select property="selectedItemName"  >
                                               <html:options collection="countryvalues" property="id" labelProperty="name"  /> 
                                    </html:select>
        </logic:iterate>

im doing a logic iterate over this and 2 drop down list's are displayed correctly
the problem is now that i need the default value for the 1st dropdown and 2nd drop down to be selected on the basis of the value in database.

Assuming
1> Default value of 1st dropdown list is Australia ,which is fetched from database
2> Default value of 2nd dropdown list is Brazil ,which is fetched frm database

How should i modify the code to achieve this...because i have 2 dropdownlists being iterated using logic:iterrate tag.


Could you help me with this issue since i dont know how to proceed. i have read post saying we need to set the value attribute,but how do i set the value dynamically in the
<html:select .....> struts tag.....


Please help me




Deepak

[Sagar Rohankar]

What you need to know is "selected" attribute in <option> tag, look here:
http://www.w3schools.com/TAGS/att_option_selected.asp

Now, in your case, your using the struts <html:options collection="..." ../> element, e\which doesn't provide any method to preselcet the default value. So solutions may fit in your case:
1. On page load, call JS and and select that option
2. or simply use <html:option > tag and use the "selected" attribute.


HTH

[Deepak Lal]

Hi Sagar,
Thanks for the inputs.

 
           <logic iterate id="countryData" name="CountryForm" property="countryData">   
                     <bean:define id="countryvalues" name="countryData" property="dropDownList"/>   
                                    <html:select property="selectedItemName"  >   
                                               <html:options collection="countryvalues" property="id" labelProperty="name"  />    
                                     </html:select>   
           </logic:iterate>
 

On page load, call JS and and select that option ---> how should i implement this part. can you help me with this.
if you have an existing JS function can you paste it?

[Sagar Rohankar]

Well, you've to provide an ID attribute to the <select /> tag, like

<html:select property="selectedItemName"  styleId="mySelect">     
          <html:options collection="countryvalues" property="id" labelProperty="name"  />      
</html:select> 

and in JS,
(Note: please check the code for proper JS functions)

var mySelect = document.getElementById('mySelect');
var options = mySelect.options; // this returns the option element array
for(i = 0; i < options.length; i++)
{
        var val = options[i].value;
        if(val == defVal)
        {
                // Modify this option element, like
               options[i].selected ="selected";
               break;
         }
}

Now the only part is tricky about how will you send that default value(defVal) to JS,
1. On page load, call JS like this

<body onload="return setDefalut(${bean.defalutCountry}")>

Now, this is no more "struts" question, so better continue it in HTML-JavaScript section.

[Aditya Keyal]

To select a value by default in the html:select tag there are 2 ways:

1) The combination of name and value should evaluate to the default selected value.

ex.

   <html:select name="formBeanName" property="propertyName" >
<html:options ... />

</html:select> 

Here name is a bean in the request scope whose property value called propertyname should evaluate to the default selected value.

2) Have a default selected by using EL.

             <html:select property="propertyName"  value="${request.DefaultSelectedValueInRequest}">
                      <html:options .../>
             </html:select>

Here also the DefaultSelectedValueInRequest is the value set in the request scope.

For more details go through the literature of struts-tag for logic:select to understand more about it.

[Sagar Rohankar]

hmm, good. my mind telling me this, but I ignore.
Thanks Aditya.