Print Data from Multiple Tabs

In this guide, we will implement printing data from multiple tabs in ToolJet. This will be useful when printing an invoice or a report from your ToolJet application. For example, a ToolJet app that has a set of tabs for each invoice, and you want to print all the tabs in one go.

UI of the App

On the ToolJet homepage, click on the ellipses on the Create new app button. Choose an app with a set of tabs for each record. Each tab will have a set of fields to display. For this guide, we will be using the Lead Management System app.

In the example below, we have the Tabs component and each tab has a set of fields to display the record details.

• Tabs: Each tab represents different type of lead record. For this app, we have 4 tabs. Each tab has an id starting from 0 to 4.

• Button: The Create Lead button is the deafult button. For this guide, we will also add another button named Download PDF, that will print the data from all the tabs. The button will have two events, the details for which we will share later in this guide.

Load Data from Database

• To load the data from the database, we will use the lead_management_system table.
• In the fetchLeads query, choose lead_management_system in Table name parameter.
• Choose List rows in the Operations parameter.
• Click on the Run button in the query panel to load the data.

Once the data is successfully loaded on the tabs and the app is working as expected, we can move to the next step.

Printing Data from Multiple Tabs

To print data from multiple tabs, we will create few JavaScript queries. Using event handlers, we will run these JavaScript queries in a sequence to print data from all the tabs.

Before we start creating the JavaScript queries, we need to add a few events to the Download PDF button:

Note: We will create the viewTabs query later in this guide, so you will need to add the event to the button after you've created the query.

Creating Queries

viewTabs Query

The viewTabs query is a JavaScript query that will run a loop to print data from all the tabs. The query will set a variable tabIndex that will store the id of the tab to print data from. The query for this app will loop and increment the tabsIndex variable by 1, using the setVariable action, till the value is less than 4.

if ((variables?.tabIndex ?? undefined) == undefined) { 
  await actions.setVariable("tabIndex", "0"); // set tabIndex to 0 if it is not set
} else if (parseInt(variables.tabIndex) < 4){
  await actions.setVariable("tabIndex", (parseInt(variables.tabIndex) + 1).toString()); // increment tabIndex by 1
}

This query will have 3 events:

Event 1:

• In the viewTabs query, click on the New event handler button, for the event type, choose Query Success from the dropdown.
• Choose Control component as the Action for the event.
• In the Run only if parameter of the event, copy the code: {{parseInt(variables.tabIndex) < 4}}. This will run only if the output of the given code is true, i.e. if the tabIndex is less than 4.
• Under the ACTION OPTIONS of the event, choose Action as Set current tab.
• Copy the code: {{variables.tabIndex}} in the Id parameter. This sets the current tab to the tab with id stored in the tabIndex variable, i.e. it sets the current tab to the tab whose id got recently stored in the tabIndex variable via the viewTabs query.

Event 2:

• The second event in this query will also be a Query Success event.
• Choose Run Query as the Action for the event.
• In the Run Only If parameter, copy the code: {{parseInt(variables.tabIndex) < 4}}. This event will run only if the condition given in the code is true.
• The query for this event handler will be getTabsHTML.
• Add a Debounce of 100 milliseconds to this event handler.

Note: We will create the getTabsHTML query later in this guide, so you will need to add the event to the button after you've created the query.

Event 3:

• The third event in this query will also be a Query Success event.
• Choose Run Query as the Action for the event.
• In the Run Only If parameter, copy the code: {{parseInt(variables.tabIndex) === 4}}. This action runs only when the tabIndex is equal to 4, i.e. the last iteration of the loop and we will print the data from all the tabs in this iteration.
• The query for this event handler will be printPDF.

Note: We will create the printPDF query later in this guide, so you will need to add the event to the button after you've created the query.

Now that we have created the viewTabs query, we can go to the Download PDF button and add the viewTabs query to the On click event handler.

getTabsHTML Query

The getTabsHTML is a JavaScript query that will get the HTML of the current tab and store it in a variable. The query will have a variable tabsHtml that will store the HTML of all the tabs in the form of an array.

actions.setVariable( // set tabsHtml variable
  "tabsHtml", 
  [...(variables?.tabsHtml ?? [])].concat([  // add html of the current tab to the tabsHtml variable
    ((variables?.tabIndex ?? -1) > 0 
      ? `<div style="top: ${ // add a div with height of 100vh to the html of the current tab
          variables?.tabIndex ?? -1 
        }00vh; position: absolute;">` // this will help to print data from all the tabs in one go
      : "") + 
      document.getElementsByClassName("widget-" + components.tabs1.id)[0] // get the html of the current tab
        .innerHTML +
      "</div>", // add the html of the current tab to the tabsHtml variable
  ])
);

This query will have 1 event:

Event 1:

• The event in this query will be a Query Success event.
• This event will have an Action of Run Query.
• In the Query Parameter, choose viewTabs as the query. This will run the viewTabs query after the getTabsHTML query is successfully executed.

Now that we have created the getTabsHTML query, we can go to the viewTabs query and in the Event 2 of that query, add the getTabsHTML query to the event handler.

printPDF Query

The printPDF query is a JavaScript query that generates a printable document from the HTML content stored in the tabsHtml variable. This query will open a new window and write the HTML content of all the tabs. This will allow the user to download a PDF document that includes the formatted content of all the tabs.

var printContents = variables.tabsHtml; // get the html of all the tabs from the tabsHtml variable

var winPrint = window.open("", "", "width=900,height=650"); // Open a New Window for Printing

var styles = document.querySelectorAll('link, style');
var stylesHtml = "";
for (var i = 0; i < styles.length; i++) {
  stylesHtml += styles[i].outerHTML;
}                                       // gather styles from the current page

stylesHtml += '<style>@page { size: landscape; }</style>'; // add landscape orientation to the page

winPrint.document.write(
  "<html><head>" +
    stylesHtml +
    "</head><body>" 
); // add styles to the page

for (var j = 0; j < printContents.length; j++) {
  winPrint.document.write(printContents[j]);
} // add html of all the tabs to the page

winPrint.document.write("</body></html>"); // Document Finalization and Printing
winPrint.document.close();
winPrint.focus();
winPrint.print();
winPrint.close();

This query will have 3 events:

Event 1:

• In the printPDF query, click on the New event handler button, for the event type, choose Query Success from the dropdown.
• Choose Unset variable as the Action for the event.
• Under the ACTION OPTIONS of the event, set tabsIndex as the Key. This will unset the tabsIndex variable after the printPDF query is successfully executed.

Event 2:

• The second event in this query will also be a Query Success event.
• Choose Unset variable as the Action for the event.
• Under the ACTION OPTIONS of the event, set tabsHtml as the Key. This will unset the tabsHtml variable after the printPDF query is successfully executed.

Event 3:

• The third event in this query will also be a Query Success event.
• Choose Control component as the Action for the event.
• Choose tabs1 for the Component parameter.
• Choose Set current tab as the Action.
• For the Id parameter, copy the code: {{variables.lastSelectedTab}}. This will set the current tab to the tab that was selected before the Download PDF button was clicked.

Now that we have created the printPDF query, we can go to the viewTabs query, and in the Event 3 of that query, add the printPDF query to the Query Success event handler.

Finally, we can test the app by clicking on the Download PDF button. This will redirect us to the new tab of the browser, and download a PDF document with the data from all the tabs.