重要

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22.2.10. The HTML Frame Item

It is possible to add a frame that displays the contents of a website or even create and style your own HTML page and display it! You can add a picture with the Add HTML following items creation instructions and manipulate it the same way as exposed in Interacting with layout items. Note that the HTML scale is controlled by the layout export resolution at the time the HTML frame is created.

The HTML item can be customized using its Item Properties panel. Other than the items common properties, this feature has the following functionalities (see 图 22.55):

图 22.55 HTML Frame, the Item Properties Panel

22.2.10.1. HTML Source

The HTML Source group of the HTML frame Item Properties panel provides the following functionalities (see 图 22.56):

图 22.56 HTML frame, the HTML Source properties

• In URL you can enter the URL of a webpage you copied from your Internet browser or select an HTML file using the ... ^Browse button. There is also the option to use the ^{Data-defined override} button, to provide a URL from the contents of an attribute field of a table or using a regular expression.

• In Source you can enter text in the textbox with some HTML tags or provide a full HTML page.

• The Insert or Edit an Expression... button can be used to add an expression like [%Year($now)%] in the Source textbox to display the current year. This button is only activated when radiobutton Source is selected. After inserting the expression click somewhere in the textbox before refreshing the HTML frame, otherwise you will lose the expression.

• Activate Evaluate QGIS expressions in HTML code to see the result of the expression you have included, otherwise you will see the expression instead.

• Use the Refresh HTML button to refresh the HTML frame(s) and see the result of changes.

22.2.10.2. Frames

The Frames group of the HTML frame Item Properties panel provides the following functionalities (see 图 22.57):

图 22.57 HTML frame, the Frames properties

• With Resize mode you can select how to render the HTML contents:

  • Use existing frames displays the result in the first frame and added frames only.

  • Extend to next page will create as many frames (and corresponding pages) as necessary to render the height of the web page. Each frame can be moved around on the layout. If you resize a frame, the webpage will be divided up between the other frames. The last frame will be trimmed to fit the web page.

  • Repeat on every page will repeat the upper left of the web page on every page in frames of the same size.

  • Repeat until finished will also create as many frames as the Extend to next page option, except all frames will have the same size.

• Use the Add Frame button to add another frame with the same size as selected frame. If the HTML page does not fit in the first frame it will continue in the next frame when you use Resize mode or Use existing frames.

• Activate Don't export page if frame is empty prevents the page from being exported when the frame has no HTML contents. This means all other layout items, maps, scale bars, legends etc. will not be visible in the result.

• Activate Don't draw background if frame is empty prevents the HTML frame being drawn if the frame is empty.

22.2.10.3. Use smart page breaks and User style sheet

The Use smart page breaks dialog and User style sheet dialog of the HTML frame Item Properties panel provides the following functionalities (see 图 22.58):

图 22.58 HTML frame, Use smart page breaks and User style sheet properties

• Activate Use smart page breaks to prevent the html frame contents from breaking mid-way a line of text so it continues nice and smooth in the next frame.

• Set the Maximum distance allowed when calculating where to place page breaks in the html. This distance is the maximum amount of empty space allowed at the bottom of a frame after calculating the optimum break location. Setting a larger value will result in better choice of page break location, but more wasted space at the bottom of frames. This is only used when Use smart page breaks is activated.

• Activate User style sheet to apply HTML styles that often is provided in cascading style sheets. An example of style code is provided below to set the color of <h1> header tag to green and set the font and font size of text included in paragraph tags <p>.

  h1 {color: #00ff00;
  }
  p {font-family: "Times New Roman", Times, serif;
     font-size: 20px;
  }
  

• Use the Update HTML button to see the result of the style sheet settings.