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POread value from txt file in javascript
 

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  1. POread value from txt file in javascript
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    <p>I have a simple html file in which there's javascript code referring to google charts. </p> <p>The code I use is this (I'll show the important part):</p> <pre><code>function drawChart(){ var data = google.visualization .arrayToDataTable([ ['Label', 'Value'],['Temp', 22.75],]); // etc... } </code></pre> <p>I use a bash command (sed) to replace that 22.75 value with a new one from the last line of a .txt file. However, this throws some errors which I haven't been able to neither correct nor ever identify.</p> <p>So is there any javascript code that takes that file, extracts the last value and simply displays it on the right place of the code?</p> <p>UPDATE:</p> <p>Sorry for the lack of info in this question, I really appreciate all the people that took the time on reading my question. I'll try to fill with more information in the next minutes.</p> <p>I am able to extract the last line of the .txt file, extract the value on the right part of the '-' symbol and store it in a variable. Then that value is taken to update the html file with a sed command. The error comes when the value is updated but with no value. I guess that happends due to a failed record of temperature in the txt file, then the extracted value is a null. Finally is the html fiel with javascrit code happens to be like this:</p> <p>(...)['Temp'<strong>, ],</strong>]);</p> <p>Then the updater can't update the value since due to the way that sed command is written I guess there's no way that it can detect a no-number-value in there. So the html remains without a value all the time.</p> <p>TXT File structure:</p> <p>(...) <br/> 20:25:03-23.312<br/> 20:26:02-23.312<br/> 20:27:03-23.375<br/> 20:28:03-23.375<br/> 20:29:02-23.375<br/> 20:30:02-23.312<br/></p> <p>Bash script:</p> <pre><code># (...code...) lastRecord=`cat /home/pi/scripts/temp_control/logs/"$today".log | awk 'END{print}'` function rightNow { lastTemp=`echo $lastRecord | cut -d'-' -f2` timeOfTemp=`echo $lastRecord | cut -d'-' -f1` # Not used yet #Command used to update sed -i "s/['Temp', [0-9]\{1,2\}.[0-9]\{1,3\}]/$lastTemp]/" /var/www/rightnow.html } rightNow </code></pre>
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    1. USMichael Foukarakis
    1. USederollora
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      1. POread value from txt file in javascript
      1. USGitaarLAB
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    1. COshow the errors
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    2. COAlmost certainly. How is the text file structured?
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      1. USScott Sauyet
    3. COPlease add the last part (say the last 2..3 lines) of the file to your question. Also, is there also java involved? If not, delete that tag. Also, what environment runs the html-file? I'm guessing a browser, so please state what browser you use (since I'm guessing the txt file is a local file ?) ?
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      1. USGitaarLAB
 

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