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<p>Hi Patrick,</p>
<p>I think that you can not get the text from the label with the
item_variables function. The keys are limited to the predefinded
variables like:</p>
<p>_project_transform_context,item_id,item_uuid,layer_ids,layers,layout_dpi,layout_name,layout_numpages,layout_page,layout_pageheight,layout_pageoffsets,layout_pagewidth,miles_km,project_abstract,project_area_units,project_author,project_basename,project_creation_date,project_crs,project_crs_acronym,project_crs_definition,project_crs_description,project_crs_ellipsoid,project_crs_proj4,project_crs_wkt,project_distance_units,project_ellipsoid,project_filename,project_folder,project_home,project_identifier,project_keywords,project_last_saved,project_path,project_title,project_units,qgis_locale,qgis_os_name,qgis_platform,qgis_release_name,qgis_short_version,qgis_version,qgis_version_no,test,user_account_name,user_full_name</p>
<div class="moz-cite-prefix">But you can use your own variable like
filename and access it from anywhere:</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><img
src="cid:part1.2A9DABB8.6ADA6ED0@wheregroup.com" alt=""></div>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">Am 04.08.2021 um 13:27 schrieb Patrick
Dunford:<br>
</div>
<blockquote type="cite"
cite="mid:2838a2d8-a989-8cdb-fb8d-8753dcfa6ae2@gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>I'm looking through the documentation and there is this
example:</p>
<div class="section" id="layout-functions">
<h3><a class="toc-backref"
href="https://docs.qgis.org/3.10/en/docs/user_manual/working_with_vector/expression.html#id24"
moz-do-not-send="true"><span class="section-number">14.2.2.13.
</span>Layout Functions</a></h3>
<p>This group contains functions to manipulate print layout
items properties.</p>
<div class="wy-table-responsive">
<table class="colwidths-auto docutils align-default">
<thead> <tr class="row-odd">
<th class="head">
<p>Function</p>
</th>
<th class="head">
<p>Description</p>
</th>
</tr>
</thead> <tbody>
<tr class="row-even">
<td>
<p>item_variables</p>
</td>
<td>
<p>Returns a map of variables from a layout item
inside this print layout</p>
</td>
</tr>
</tbody>
</table>
</div>
<p><strong>An example:</strong></p>
<ul>
<li>
<p>Get the scale of the ‘Map 0’ in the current print layout:</p>
<div class="highlight-default notranslate">
<div class="highlight">
<pre><span></span><span class="n">map_get</span><span class="p">(</span> <span class="n">item_variables</span><span class="p">(</span><span class="s1">'Map 0'</span><span class="p">),</span> <span class="s1">'map_scale'</span><span class="p">)</span>
</pre>
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</div>
</li>
</ul>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">How do I find out how to get the text
value of the layout item "Filename" on the current print layout?
<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 4/08/21 2:40 pm, Patrick Dunford
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:a680851a-f408-d111-8ccc-ff6da5b33348@gmail.com">It is
just an ordinary text field on a composer layout I think. I
don't use the atlas functionality. <br>
<br>
On 4/08/21 10:19 am, Nyall Dawson wrote: <br>
<blockquote type="cite">On Wed, 4 Aug 2021 at 06:17, Patrick
Dunford <a class="moz-txt-link-rfc2396E"
href="mailto:enzedrailmaps@gmail.com" moz-do-not-send="true"><enzedrailmaps@gmail.com></a>
wrote: <br>
<blockquote type="cite">Good day <br>
<br>
I am wishing to create a value in a field on a composer
layout that <br>
reads the value of another field on the layout and
calculates a value to <br>
be displayed. <br>
<br>
For example, I have an existing field called Filename on the
layout and <br>
in a python script running in the main window console, I
have this code <br>
that reads the value of the Filename field as follows: <br>
<br>
layoutTitle = "Landscape 16:9 Header Nav Copyright Filename
2021" <br>
<br>
project = QgsProject.instance() <br>
projectLayoutManager = project.layoutManager() <br>
layout = projectLayoutManager.layoutByName(layoutTitle) <br>
<br>
fileNameLabel = layout.itemById('Filename') <br>
fileNameText = fileNameLabel.text() <br>
<br>
<br>
Obviously I am hoping that doing this from a field within
the layout <br>
that reads another field on the same layout will be much
simpler than <br>
the above. How exactly would I achieve that? <br>
</blockquote>
Just to clarify -- by "field" do you mean "a field value from
the <br>
atlas layer", or "a text label item"? <br>
<br>
Nyall <br>
</blockquote>
</blockquote>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
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