[SalesForce] Visualforce: Adding CSS class from Controller

Is it possible to add a CSS class to one of the Visualforce page objects from controller?
What I want to achieve is to handle one exception in controller. From catch block I want to be able to hide a form (add a CSS class to form with display:hidden).

Best Answer

Create a variable in your controller,

public boolean isVisible{gt;set;}

assign it true/false depending on condition(exception in your case)

surround form you want to show by an output panel

<apex:outputPanel rendered="{!isVisible}">
<apex:form>
.
.
.
.
</apex:form>
</apex:outputPanel>

Related Solutions

[SalesForce] visualforce, adding new products to a table on same page

Answer to Question #1

You need to overwrite the standard controller Save method to return a null PageReference. Don't forget to instantiate the StandardController in your constructor:

ApexPages.StandardController controller { get; set; }
public ProductDataController(ApexPages.StandardController controller)
{
    this.controller = controller;
}

public PageReference Save()
{
    controller.save();
    return null;
}

Answer to Question #2

Instead of:

<apex:commandButton value="Delete product" action="{!removeProduct}" rerender="ProductTabele"/>

Do:

<apex:commandButton value="Delete product" action="{!removeProduct}" rerender="ProductTabele">
    <apex:param value="{!product.Id}" assignTo="{!productIdToDelete}" name="productIdToDelete" />
</apex:commandButton>

And then in your controller:

public Id productIdToDelete { get; set; }

public List<Product__c { get { return productMap.values(); } }
public Map<Id, Product__c> productMap
{
    get
    {
        if (productMap == null)
        {
            productMap == new Map<Id, Product__c> ( [SELECT Name, Product_Name__c, Product_Type__c FROM Product__c ] ); // YOU SHOULD REALLY MAKE THIS QUERY SELECTIVE
        }
        return productMap;
    }
    private set;
}
public PageReference removeProduct
{
    if (productIdToDelete != null) productMap.remove(productIdToDelete);
    return null;
}

[SalesForce] Pass parameter from html select tag to controller

Use <apex:selectlist> and <apex:selectOption>

Use selected/disabled attribute of <apex:selectOption>

<apex:selectlist value="{!city}" size="1"> 
      <apex:selectOption itemlabel="City" itemValue=""/>
      <apex:selectOption itemlabel="City A" itemValue="City A"/>
      <apex:selectOption itemlabel="City B" itemValue="City B"/>
      <apex:selectOption itemlabel="City C" itemValue="City C"/>
</apex:selectlist>

Use <apex:inputHidden>

<apex:inputHidden value="{!city}" id="cityId"/> 

<select onchange="document.getElementById('{!$Component.cityId}').value = this.value;"> 
      <option value="" selected="selected" disabled="disabled">City</option> 
      <option value="City A">City A</option> 
      <option value="City B">City B</option> 
      <option value="City C">City C</option> 
</select>

Best Answer

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[SalesForce] Pass parameter from html select tag to controller

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