[SalesForce] Display images from Salesforce Document folder

I currently managed to display some images(from salesforce Documents folder) on an extracted Excel sheet from Salesforce but I have hard coded the document Ids. So this might not work after creating package and after installing to different orgs.

I'm looking for a way to get the document Ids without hard coding them. Is there any way doing this ?

Apex Code:-

            movementDirUp = System.URL.getSalesforceBaseUrl().toExternalForm().replace('https','http')+'/servlet/servlet.ImageServerid=015240000005U3V&oid='+UserInfo.getOrganizationId();
            movementDirDown = System.URL.getSalesforceBaseUrl().toExternalForm().replace('https','http')+'/servlet/servlet.ImageServer?id=015240000005U3T&oid='+UserInfo.getOrganizationId();
            movementDirRight = System.URL.getSalesforceBaseUrl().toExternalForm().replace('https','http')+'/servlet/servlet.ImageServer?id=015240000005U3U&oid='+UserInfo.getOrganizationId();
            //Map to display images
            mapClimateMovement = new Map<String, String>{'climate_up_arrow' => movementDirUp , 'climate_down_arrow' => movementDirDown , 'climate_right_arrow' => movementDirRight.toLowerCase()};

Visualforce Code:-

<apex:image value="{!IF(CONTAINS(reportRow.parentInfo[field],'Up'),mapClimateMovement['risk_climate_up_arrow'],'')}"  rendered="{!CONTAINS(reportRow.parentInfo[field],'Up')}" />
                                <apex:image value="{!IF(CONTAINS(reportRow.parentInfo[field],'Down'),mapClimateMovement['risk_climate_down_arrow'],'')}" rendered="{!CONTAINS(reportRow.parentInfo[field],'Down')}" />
                                <apex:image value="{!IF(CONTAINS(reportRow.parentInfo[field],'Level'),mapClimateMovement['risk_climate_right_arrow'],'')}" rendered="{!CONTAINS(reportRow.parentInfo[field],'Level')}"/>

Best Answer

You can use something like this

List<String> lstDocNames; //Populate list with document names
Map<String, id> mapDocs; 

public void getDocuments(){
    mapDocs = new Map<id, String>();
    for(Document d: [Select Id from Document d where d.DeveloperName in :lstDocNames]){
        mapDocs.put(d.name, d.id); 
    }
}
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