Jinjafx_input: Multiple <textarea> Elements Merge Into One Variable Due To Missing Newline After First Scalar

May 9, 2025 by ADMIN 110 views

jinjafx_input: Multiple elements merge into one variable due to missing newline after first scalar</strong></p> <h3><strong>Description</strong></h3> <img src="/image?q=**Description**" title="**Description**" width="300" height="200" /><p>When a custom <code>jinjafx_input</code> form contains two or more <code><textarea></code> elements, the client-side code concatenates the second textarea's YAML block header onto the end of the first textarea's scalar because the terminating CRLF is missing. The YAML loader therefore interprets the entire fragment as one scalar, so only the first key is produced in <code>jinjafx_input</code>, with both textarea contents jammed together.</p> <p>This issue arises due to a missing newline character after the first scalar in the <code>jinjafx_m.js</code> file. As a result, the YAML loader fails to correctly parse the YAML block, leading to unexpected behavior.</p> <h3><strong>Steps to Reproduce</strong></h3> <p>To reproduce this issue, follow these steps:</p> <ol> <li> <p>Create a <code>vars.yml</code> file with the following content:</p> <pre><code class="hljs">--- jinjafx_input: body: |2 <div class="mb-3"> <label for="t1" class="form-label">Notes</label> <textarea class="form-control" id="t1" rows="3" data-var="notes"></textarea> </div> <div class="mb-3"> <label for="t2" class="form-label">Comments</label> <textarea class="form-control" id="t2" rows="3" data-var="comments"></textarea> </div> </code></pre> </li> <li> <p>Launch JinjaFx and fill both textareas with the following values: <code>"Text area"</code>, <code>"Text area 2"</code> -> Generate.</p> </li> <li> <p>Inspect the variables with the following Jinja2 code:</p> <pre><code class="hljs">{{ jinjafx_input | to_nice_json(indent=2) }} </code></pre> </li> </ol> <h3><strong>Expected Behavior</strong></h3> <p>The expected behavior is that the <code>jinjafx_input</code> variable should contain two separate keys: <code>notes</code> and <code>comments</code>, each with its corresponding value.</p> <pre><code class="hljs">{ "notes": "Text area", "comments": "Text area 2" } </code></pre> <h3><strong>Actual Behavior</strong></h3> <p>However, due to the missing newline character, the actual behavior is that the <code>jinjafx_input</code> variable contains only one key: <code>notes</code>, with the value being a concatenation of the first textarea's value and the second textarea's YAML block header.</p> <pre><code class="hljs">{ "notes": "Text area comments: |2\nText area 2" } </code></pre> <h3><strong>Root Cause</strong></h3> <p>The root cause of this issue is the missing newline character after the first scalar in the <code>jinjafx_m.js</code> file. Specifically, the line of code that appends the scalar to the <code>vars_yml</code> string is missing the <code>\r\n</code> characters.</p> <pre><code class="hljs">var vars_yml = 'jinjafx_input:\r\n'; // ... vars_yml += ' ' + v + ': ' + vars[v]; 👈🏼 </code></pre> <p>This omission causes the YAML loader to interpret the entire fragment as one scalar, leading to the unexpected behavior.</p> <h3><strong>Environment</strong></h3> <p>The environment in which this issue was encountered is as follows:</p> <ul> <li> <p><strong>JinjaFx Server</strong>: <code>v25.7.0</code></p> </li> <li> <p><strong>OS</strong>: macOS 15.4.1 (local devcontainer: <code>python:3.12-slim</code> and <code>PEP660 workflow</code>)</p> </li> <li> <p><strong>Browser</strong>: <code>Chrome 136.0.7103.93</code></p> </li> <li> <p><strong>Run command</strong>:</p> <pre><code class="hljs">docker run --rm -it -p 8080:8080 -v "$PWD":/app jinjafxserver-localdev </code></pre> </li> </ul> <h3><strong>Suggested Fix</strong></h3> <p>To fix this issue, a simple one-line change can be made to the <code>jinjafx_m.js</code> file. Specifically, the line of code that appends the scalar to the <code>vars_yml</code> string should be modified to include the missing newline character.</p> <pre><code class="hljs">- vars_yml += ' ' + v + ': ' + vars[v]; + vars_yml += ' ' + v + ': ' + vars[v] + '\r\n'; </code></pre> <p>This change should be applied to the line of code that is currently missing the newline character. With this fix, the YAML loader should correctly parse the YAML block, and the <code>jinjafx_input</code> variable should contain the expected values.</p> <h3><strong>Conclusion</strong></h3> <p>In conclusion, the issue of multiple <code><textarea></code> elements merging into one variable due to a missing newline character after the first scalar is a bug in the <code>jinjafx_m.js</code> file. By applying a simple one-line fix, this issue can be resolved, and the <code>jinjafx_input</code> variable should contain the expected values.<br/> <strong>jinjafx_input: Multiple <textarea> elements merge into one variable due to missing newline after first scalar - Q&A</strong></p> <h3><strong>Q: What is the issue with the jinjafx_input form?</strong></h3> <p>A: The issue with the <code>jinjafx_input</code> form is that when it contains two or more <code><textarea></code> elements, the client-side code concatenates the second textarea's YAML block header onto the end of the first textarea's scalar because the terminating CRLF is missing. This causes the YAML loader to interpret the entire fragment as one scalar, leading to unexpected behavior.</p> <h3><strong>Q: What is the expected behavior of the jinjafx_input variable?</strong></h3> <p>A: The expected behavior of the <code>jinjafx_input</code> variable is that it should contain two separate keys: <code>notes</code> and <code>comments</code>, each with its corresponding value.</p> <pre><code class="hljs">{ "notes": "Text area", "comments": "Text area 2" } </code></pre> <h3><strong>Q: What is the actual behavior of the jinjafx_input variable?</strong></h3> <p>A: The actual behavior of the <code>jinjafx_input</code> variable is that it contains only one key: <code>notes</code>, with the value being a concatenation of the first textarea's value and the second textarea's YAML block header.</p> <pre><code class="hljs">{ "notes": "Text area comments: |2\nText area 2" } </code></pre> <h3><strong>Q: What is the root cause of this issue?</strong></h3> <p>A: The root cause of this issue is the missing newline character after the first scalar in the <code>jinjafx_m.js</code> file. Specifically, the line of code that appends the scalar to the <code>vars_yml</code> string is missing the <code>\r\n</code> characters.</p> <pre><code class="hljs">var vars_yml = 'jinjafx_input:\r\n'; // ... vars_yml += ' ' + v + ': ' + vars[v]; 👈🏼 </code></pre> <h3><strong>Q: How can this issue be fixed?</strong></h3> <p>A: This issue can be fixed by applying a simple one-line change to the <code>jinjafx_m.js</code> file. Specifically, the line of code that appends the scalar to the <code>vars_yml</code> string should be modified to include the missing newline character.</p> <pre><code class="hljs">- vars_yml += ' ' + v + ': ' + vars[v]; + vars_yml += ' ' + v + ': ' + vars[v] + '\r\n'; </code></pre> <h3><strong>Q: What is the environment in which this issue was encountered?</strong></h3> <p>A: The environment in which this issue was encountered is as follows:</p> <ul> <li> <p><strong>JinjaFx Server</strong>: <code>v25.7.0</code></p> </li> <li> <p><strong>OS</strong>: macOS 15.4.1 (local devcontainer: <code>python:3.12-slim</code> and <code>PEP660 workflow</code>)</p> </li> <li> <p><strong>Browser</strong>: <code>Chrome 136.0.7103.93</code></p> </li> <li> <p><strong>Run command</strong>:</p> <pre><code class="hljs">docker run --rm -it -p 8080:8080 -v "$PWD":/app jinjafxserver-localdev </code></pre> </li> </ul> <h3><strong>Q: Can this issue be reproduced?</strong></h3> <p>A: Yes, this issue can be reproduced by following the steps outlined in the "Steps to Reproduce" section of the original article.</p> <h3><strong>Q: What is the suggested fix for this issue?</strong></h3> <p>A: The suggested fix for this issue is to apply the one change to the <code>jinjafx_m.js</code> file, as outlined in the "Suggested Fix" section of the original article.</p> <h3><strong>Q: Will this fix resolve the issue?</strong></h3> <p>A: Yes, this fix should resolve the issue and ensure that the <code>jinjafx_input</code> variable contains the expected values.</p> </div> <aside class="related-posts"><h2 class="related-posts-title">Related Posts</h2> <div class="related-posts-list"><article class="related-post"> <h3 class="related-post-title"> <a href="https://devflowstack.org/blog/spring-crash-105-1-1-1746761236703">Spring Crash [105.1.1-2511-g747f18b] </a> </h3> <div class="meta"> <time datetime="2025-05-09T03:27:16+00:00">May 9, 2025</time> <span class="view-count"> <svg width="16" height="16" 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