I want to do the query below into a function:
insert into table values (msg.payload.1, msg.payload.2);
this function has two input (2 different msg.payload)
so the code that I am trying to write is:
var m={
topic: "insert into info values ('"+msg.payload+"','"+msg.payload+"');"
};
return m;
it is adding two rows in the info table.
but want to add only one row with two different values.
any idea?
Thanks in advance
If I've understood properly you have 2 different nodes feeding data into this function and you want to use the values from these separate messages to build your insert statement.
This is not how Node-RED works, each message is handled totally separately from each other (hence why you see 2 rows added to the DB).
If you want to combine 2 separate messages you will need to make use of the context to keep state. You will also need a way to identify which message is which when it comes in, this is normally done by message topic, but it could be any unique feature.
Related
I’ve been trying to figure out how to write a script which will take the value from one cell and append it to the end of a string of numbers in another cell of that same row. The newly appended number needs to be separated by a comma from the previously appended value, and the whole string needs to be wrapped between brackets. EX. [2,3,3,4.5,2.5,2.1,1.3,0.4]. The script will need to loop through all of the rows containing data on a named sheet beginning with the third row.
The above image is obviously just an example containing only two rows of data. The actual spreadsheet will contain well over a thousand rows, so the operation must be done programmatically and will run weekly using a timed trigger.
To be as specific as I can, what I need help with is to first know if something like the appending is even possible in Google App Scripts. I've spent hours searching and I can't seem to find a way to append a new value (ex. cell A3) to the current string (ex. cell B3) without overwriting it completely.
In full disclosure; I'm a middle school teacher trying to put something together for my school.
To be as specific as I can, what I need help with is to first know if something like the appending is even possible in Google App Scripts.
Seeing the expected result, it's inserting rather than appending, as the string should be added before the last character (]). Anyway, yes, this is possible by using JavaScript string handling methods.
Use getValue() to the get the cell values, both the Current GPA and the GPA History.
One way is to use replace
Example using pure JavaScript:
var currentGPA = 3.5
var gpaHistory = '[2,3.1,2.4]';
gpaHistory = gpaHistory.replace(']',','+currentGPA+']');
console.info(gpaHistory)
Once you get the modified gpaHistory, use setValue(gpaHistory) to add this value to the spreadsheet.
I am making a survey in Qualtrics. This survey has a repeating question with six answer choices. The six choices are randomized (in the standard way, no javascript). The question is being repeated using loop&merge, which works great because it's the same question structure over and over (36 times), but I can use the field function to adjust the question and answers for every iteration.
However, one problem I am running into is that Qualtrics does not (as standard) support the recording of the randomization data in the results - i.e. how it has randomized the six answer choices in each iteration. When I use the 'Export Randomized Viewing Order data' function when downloading results, it only shows the answer order of the last time it asked the question. So it seems that this is a value that gets overwritten after each iteration.
So now I'm looking to record the answer order for each iteration through javascript. However, I haven't found a function that gives the order answer (after randomization). I have consulted the Qualtrics javascript API and found some functions that seem promising, such as getChoices (), but when I try this all I get back is the order of answers without randomization (i.e. just 1,2,3,4,5,6).
Does anyone know a way to record the randomized choice order for each iteration, using javascript or otherwise?
I found a different way to record the loop and merge randomization order.
Create an embedded data field in survey flow. Here we will record the randomization order. I will call the field rand_order.
Add a loop and merge field with a unique number to identify each loop (e.g. 1, 2, 3, 4, 5, ..., n).
Then add the next javascript to any page of the looped block.
//*Place Your Javascript Below This Line*/
var questionText = "${lm://Field/1}"; // "${lm://Field/1}" will actually evaluate to
//whatever is Field 1 in the current Loop & Merge loop.
// You can do this with embedded data too, as seen in the next line
var order = "${e://Field/rand_order}" + "|" + questionText; // gets the value of the embedded data
// field "rand_order", concatenates the current loop's identifier to it,
//and stores that as a variable
Qualtrics.SurveyEngine.setEmbeddedData('rand_order', order); // updates the
//embeddeddata field "rand_order" to be our order variable, which has the current loop's
//identifier attached, effectively constructing a string of numbers representing the order
You will get a column with the name "rand_order" filled with "1|5|23|2...|n". You can change the separator to make more compatible with whatever script you are using to manipulate data.
Qualtrics already records this information for you. It's just a matter of explicitly asking for it when you download your data. Number 5 on this page has more info, but I'll recount the important bits:
In the “Data & Analysis” tab, click “Export & Import” and then “Export Data”.
In the “Download Data Table” window click “More Options”.
Check the box for “Export viewing order data for randomized surveys”.
I think the thing here is to look at the order of choices in the DOM. Qualtrics provides the getChoiceContainer() method to get the div containing the choices. Here's a snippet I wrote and minimally tested:
//get the div containing the choices, then get all input child elements of that div
var choices = this.getChoiceContainer().getElementsByTagName("input");
//initialize an array for the IDs of the choices
var choiceIDs = []
//add the ID of each choice to the array
for (var i=0; i < choices.length; i++) {
choiceIDs.push(choices[i].id);
}
//get the current choice order from embedded data and add this loop to it.
//Add a | to distinguish between loops.
var choiceOrder = "${e://field/choiceorder}" + choiceIDs.toString() + "|";
//set the embedded data with the new value
Qualtrics.SurveyEngine.setEmbeddedData("choiceorder", choiceOrder);
A couple of notes/caveats:
I only tested this on a basic multiple choice question with radio buttons. It may need to be adjusted for different question types.
I also just got the IDs of the question choices. You could probably modify it pretty easily to get other information, like the label of the choice, or the numeric value it corresponds to.
I have one class Messages with 3 principal fields:
id FromUser ToUser
I do have a query where the To = Value field and the From field is not repeated. I mean, get all FROMUSER who sent me a message.
Any Idea?
Thanks!
As #Fosco says, "group by" or "select distinct" are not supported yet in Parse.com.
Moreover keep in mind the restriction on the selection limit (max 1000 results for query) and timeout request call ( 3 seconds in the before save events, 7/10 seconds in the custom functions ). For the "count" selection, the restriction is the timeout request call.
I'm working on Parse.com too, and i've changed a lot the structure of my db model, often adding some inconsistent columns in several classes, keeping them carefully updated for each necessary query.
For cases like yours, i suggest to make a custom function, that keep in input two parameter ( we can say, "myLimit" and "myOffset" ) for the lazy loading, then select the slices, and programmatically try to filter the resulting array item list (with a simple search using for..loop, or using some utility of UnderscoreJS). Start with small slices ( eg: 200-300 records maximum for selection ) until the last selection returns zero results ( end reached). You could count all items before start all of this, but the timeout limitation could cause you problems. If this not works as expected try to make the same, client side.
You could also make a different approach, so creating another table/class, and for each new message, adding the FromUser in that table ONLY if it doesn't already exist, for that specified ToUser.
Hope it helps
I have a table of rows and columns on an HTML-based entry form that allows the user to edit multiple records. Each row corresponds to a database record and each column to a database field.
When the user submits the form, the server needs to figure out which request parameter belongs to which row. The method I've been using for years is to prefix or suffix each HTML input element's name to indicate the row it belongs to. For example, all input elements would have the suffix "row1" so that the server would know that request parameters whose names end with "row1" are field values for the first row.
While this works, one caveat of the suffix/prefix approach is that you're adding a constraint that you can't name any other elements with a particular suffix/prefix. So I wonder if there's a better, more elegant approach. I'm using JSP for the presentation layer, by the way.
Thanks.
I don't know JSP very well, but in PHP you would define your input fields' names with an array syntax.
<input name='person[]'>
<input name='person[]'>
<input name='person[]'>
When PHP receives a form like that, it gives you an array (within the standard $_POST array), thus:
$_POST['person']=array('alice','bob','charlie');
Which makes it very easy to deal with having as many sets of fields as you want.
You can also explicitly name the array elements:
<input name='person[teamleader]'>
<input name='person[developer1]'>
would give you an array with those keys. If your current prefixes are meaningful beyond simply numbering the records, this would solve that problem.
I don't know whether the identical syntax would work for JSP, but I imagine it would allow something very similar.
Hope that helps.
Current user agents send back the values in the order of the fields as presented to the user.
This means that you could (theoretically) drop the prefix/suffix altogether and sort it out based on the ordering of the values. You'd get something like
/?name=Tom&gender=M&name=Jane&gender=F&name=Roger&gender=M
I don't know how your framework returns that, but many return it as lists of each value
name = [Tom, Jane, Roger]
gender = [M, F, M]
If you pop an element off of each list, you should get a related set that you can work with.
The downside to this is that it relies on a standard behavior which is not actually required by the specification. Still... it's a convenient solution with a behavior that won't be problematic in practice.
When browsers POST that information back to the server, it is just a list of parameters:
?name_row1=Jeff&browser_row1=Chrome&name_row2=Mark&browser_row2=IE8
So really, I think you can answer a simpler question: how do you relate keys in a key-value list?
Alternatively, you can go to a more structured delivery method (JSON or XML), which will automatically give you a structured data format. Of course, this means you'll need to build this value on the browser first, then send it via AJAX (or via the value of a hidden input field) and then unpack/deserialize it in the server code.
XML:
<rows>
<row><id>1</id><name>Jeff</name><browser>Chrome</browser></row>
<row>...</row>
</rows>
or JSON:
[{ "name":"Jeff", "browser":"Chrome"}, { "name":"Mark", "browser":"IE8" }]
There are many resources/tutorials on how to do this... Google it. Or go with the ostensible StackOverflow consensus and try jQuery.
I have an ajax function which call a servlet to get list of products from various webservices, the number of products can go up to 100,000. I need to show this list in a html table.
I am trying to provide users an interface to filter this list based on several criteria. Currently I am using a simple jQuery plugin to achieve this, but I found it to hog memory and time.
The Javascript that I use basically uses regex to search and filter rows matching the filtering criteria.
I was thinking of an alternate solution wherein I filter the JSON array returned by my servlet and bind the html table to it. Is there a way to achieve this, if there is, then is it more efficient than the regex approach.
Going through up to 100,000 items and checking if they meet your criteria is going to take a while, especially if the criteria might be complex (must be CONDO with 2 OR 3 bedrooms NOT in zip code 12345 and FIREPLACE but not JACUZZI).
Perhaps your servlet could cache the data for the 100,000 items and it could do the filtering, based on criteria posted by the user's browser. It could return, say, "items 1-50 of 12,456 selected from 100,000" and let the user page forward to the next 50 or so, and even select how many items to get back (25, 50, all).
If they select "all" before narrowing down the number very far, then a halfway observant user will expect it to take a while to load.
In other words, don't even TRY to manage the 100,000 items in the browser, let the server do it.
User enters filter and hits
search.
Ajax call to database, database has indexes on appropriate
columns and the database does the filtering.
Database returns result
Show result in table. (Probably want it to be paged to
only show 100-1000 rows at a time
because 100,000 rows in a table can
really slow down your browser.
Edit: Since you don't have a database, the best you're going to be able to do is run the regex over the JSON dataset and add results that match to the table. You'll want to save the JSON dataset in a variable in case they change the search. (I'm assuming that right now you're adding everything to the table and then using the jquery table plugin to filter it)
I'm assuming that by filtering you mean only displaying a subset of the data; and not sorting.
As you are populating the data into the table add classes to each row for everything in that row you want to filter by. e.g.:
<tr class="filter1 filter2 filter3">....
<tr class="filter1 filter3">....
<tr class="filter2">....
<tr class="filter3">....
Then when you want to apply a filter you can do something like:
$('TR:not(.filter1)').hide();
I agree with Berry that 100000 rows in the browser is bit of a stretch, but if there's anything that comes close to handling something of that magnitude then it's jOrder. http://github.com/danstocker/jorder
Create a jOrder table based on your JSON, and add the most necessary indexes. I mean the ones that you must at all cost filter by.
E.g. you have a "Name" field with people's names.
var table = jOrder(json)
.index('name', ['Name'], { sorted: true, ordered: true });
Then, for instance, this is how you select the records where the Name field starts with "John":
var filtered = table.where([{ Name: 'John' }], { mode: jOrder.startof, renumber: true });
Later, if you need paging in your table, just feed the table builder a filtered.slice(...).
If you're getting back xml, you could just use jQuery selection
$('.class', context) where context is your xml response.
From this selection, you could just write the xml to the page and use CSS to style it. That's where I'd start at first, at least. I'm doing something similar in one of my applications, but my dataset is smaller.
I don't know what you mean by "bind"? You can parse JSON and then use for loop (or $.each()) to populate ether straight HTML or by using grid plugin's insert/add