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Hashmap in Struts

 
Ravi Kumar
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posted 15 years ago
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Hello,

I need some direction on how to proceed on using hashmap. I am new to this. Please advise.

I have a form with Struts validation enabled. In my form I have a drop down.Based on value from drop down. I need to load one particular value.


My form has a default value assigned to a particular field. But when something is selected from dropdown I need to overwrite that default value with the value mentioned in the Hashmap for that selected dropdown value(key).


I am using Hashmap to store the key value pairs. Now my question is where should this functionality be. Will it be in the ActionForm or in the Action class.

Thanks.
 
Merrill Higginson
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posted 15 years ago
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Here is the process:
  • Create a property in your ActionForm for the value you want to set (example: selectedValue)
  • override the reset method of your ActionForm and in that method set the default value (example: selectedValue="x")
  • Use the <html:select> and <html:optionsCollection> tags to render the select box. Struts will then display the default value in the select box and change it when the user changes the value.

    • Example:

    The above assumes your hashmap is stored in either session or request scope under the name of "theHashMap".
    [ January 25, 2007: Message edited by: Merrill Higginson ]

    Merrill
    Consultant, Sima Solutions

     
    Ravi Kumar
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    posted 15 years ago
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    Thanks Merrill. I will try that.
     
    Bear Bibeault
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    posted 15 years ago
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    "Kris10",

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    Rodolfo Medina
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    posted 13 years ago
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    Originally posted by Merrill Higginson:
    Here is the process:

  • Create a property in your ActionForm for the value you want to set (example: selectedValue)
  • override the reset method of your ActionForm and in that method set the default value (example: selectedValue="x")
  • Use the <html:select> and <html ptionsCollection> tags to render the select box. Struts will then display the default value in the select box and change it when the user changes the value.

    • Example:
    <blockquote>code:
    <pre name="code" class="core"><html:select property="selectedValue" >
    <html ptionsCollection name="theHashMap" label="value" value="key" />
    </html:select>
    </pre>

    The above assumes your hashmap is stored in either session or request scope under the name of "theHashMap".

    [ January 25, 2007: Message edited by: Merrill Higginson ]
    </blockquote>

    Tried what you suggest and still get an error about property value not set for optionsCollection. any idea?
     
    Merrill Higginson
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    posted 13 years ago
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    If you want help debugging this, you will need to post revlevant portions of your code including the JSP, the ActionForm, the Action class, and the struts-config.xml file. Also post the exact error message you get along with the firt 10 lines or so of the stack trace.

    Merrill
    Consultant, Sima Solutions

     
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