[SalesForce] Pass apex value from one page to another

I have an outputLink like this:

<apex:outputLink value="/apex/NewPage?id='xxxcccxxx'>
    <div class="link_class">
        <strong>Link</strong>
    </div>
</apex:outputLink>

I want to pass an apex value through with this link to the next page, I'd like to pass it through s a hidden value if that's possible.

{!my_val}

And then catch it on the next page and throw it into a div.

I can't pass it in the URL as I need the URL to remain as it is.

Only using JS, html or APEX, is this possible?

Best Answer

If both pages use the same controller and extensions, you can actually pass the state of the page from the first to the second. You'd need to change the code from an apex:outputLink to a apex:commandLink to make this happen, though.

If you don't want to share the view state across pages (e.g. you need different controllers), you can also use localStorage or sessionStorage to store the variable in the browser's memory cache while you travel between pages. This will require cooperation on both pages, as the former will need to set the value (localStorage.setItem('somekey', 'value')), then retrieve it on NewPage (localStorage.getItem('somekey')). You can also use document.cookie for small values (less than about 4kb) for broader browser compatibility.

If you have no control over NewPage, then you're pretty much out of luck. You need a POST action for the variable to persist invisibly, which means the receiving page needs to be able to understand this POST request. Using apex:commandLink would be the easiest way to achieve your goal, especially if you can design both pages to use the same controller.

Related Solutions

[SalesForce] Passing a value from Visualforce Page to Controller

The easiest way I've found to do this is using window.setTimeout() with an abitrary low delay value which calls an apex:actionFunction that rerenders a dummy apex:outputPanel within an apex:actionRegion.

<script>
    window.setTimeout(function() { setParams("param1Value", "param2Value"); }, 1);
</script>

<apex:actionRegion>
    <apex:actionFunction action="{!setParams}" name="setParams" rerender="dummy">
        <apex:param name="param1" assignTo="{!param1}" value="" />
        <apex:param name="param2" assignTo="{!param2}" value="" />
    </apex:actionFunction>
    <apex:outputPanel id="dummy"/>
</apex:actionRegion>

The apex:actionRegion and the dummy apex:outputPanel prevent the whole page refreshing when the apex:actionFunction is called which will result in your JavaScript being called everytime and ending up in a refresh loop.

The apex:actionRegion also prevents the following error occurring when this is used on a page with an apex:inputFile component.

apex:inputFile can not be used in conjunction with an action component, apex:commandButton or apex:commandLink that specifies a rerender or oncomplete attribute

Your controller will looks something like this:

public class ParameterPageController
{
    public String param1 { get; set; }
    public String param2 { get; set; }

    public PageReference setParams()
    {
        return null;
    }
}

Edit:
You don't actually need the window.setTimeout() call at all and can simply call your apex:actionFunction directly, however you must put your call to your apex:actionFunction after (although not necessarily directly after) it's declaration for this to work.

<apex:actionRegion>
    <apex:actionFunction ... >
        ...
    </apex:actionFunction>
    ..
</apex:actionRegion>

 |
 |
 |

<script>
    setParams("param1Value", "param2Value");
</script>

[SalesForce] Trouble passing multiple values from one page to another in URL

@Daft, I think you resolved your own question. When passing more than one varialbes in a url, you need to seperate them using ampersand (&).

single variable: http://myapp.test.com?var1=1

2 variables: http://myapp.test.com?var1=1&var2=2

Note that the url string should be encoded for the browser to parse it correctly.

Best Answer

Related Solutions

[SalesForce] Passing a value from Visualforce Page to Controller

[SalesForce] Trouble passing multiple values from one page to another in URL

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