Context
For personal use, im creating a small project that documents my learning about data structures. I want to dynamically pull strings from a JSON file into a custom Vue component that displays code that can be run and edited in the browser by the user.
The Probem
I find the above image far easier to, not only type, but also to read, than something like this (including variations including escape strings on a single line):
"BasicArithmic" : "var a = 1;var b = 2;var c = a + 5*b;return c;"
Ultimately i just want to be able to type the string out as multiple lines inside the code so that i'm not wasting my time trying to work out what code is supposed to do.
Clarification
Im passing in code as a string to an eval(), since i couldn't work out how to pass code between components and THEN convert the code to a string.
Use ` instead of "
console.log(`
a = 1;
b = 2;
`
)
Or you could add \ to the end of each line:
x = { "BasicArithmic" : "\
var a = 1;\
var b = 2;\
var c = a + 5*b;\
return c;\
"}
console.log(x.BasicArithmic);
Related
I am using IBM BPM 8.6
I have an input string as follows:
"\"RECORD_CONTACT\":\"Maram\" , \"DRUG\":\"Panadol\"
In a script on server side, I want to dynamically create a business object like this:
tw.local.recordContact = Maram;
tw.local.drug = Panadol;
How can I dynamically create the business object?
There are a few problems with your request. The first is that you are not creating a business object, you are creating variables. In IBM BPM the variables have to be declared at design time or you will get an error, so invoking attempting to call something like -
tw.local.myVariable = 'Bob';
Will throw an exception if tw.local.myVariable has not been declared. Base on your other question you asked here (link), I'm going to assume you actually have an ANY variable declared called "return" so that
tw.local.return.myVariable = 'Bob'
will work. Given that I based on Sven's answer I think something like the following will work (you will need to validate)
var str = "\"RECORD_CONTACT\":\"Maram\" , \"DRUG\":\"Panadol\"";
var jsonStr = "{" + str.replace(/\\\"/g,'\"') + "}";
var tempValue = JSON.parse(jsonStr);
var keyArray = Object.keys(tempValue);
var valueArray = Object.values(tempValue);
for(var keyCount=0; keyCount<keyArray.length; keyCount++{
var evalString = "tw.local.return."+keyArray[keyCount]+"="+valueArray[keyCount];
eval(evalString);
}
I'll note that doing this is a very bad idea as it would be very brittle code and that using eval() in this manner opens you up to all sorts of possible exploits. It will also fail badly if the value for one of the keys is not a simple type.
-Andrew Paier
One should know what you are going to do with dynamically created Business Objects (BO) to answer you better. Like a very generic way would be - creating JSON object instead of BO.
But if you want to stick with BO then this is only possible when you know all the BO structure (schema) beforehand during design time.
var str = "\"RECORD_CONTACT\":\"Maram\" , \"DRUG\":\"Panadol\"";
vat objArray = str.split("reg ex to split each object string")
foreach (obj in objArray ){
if(obj.indexOf( "RECORD_CONTACT")!=-1)
tw.local.recordContact = new tw.object.RECORD_CONTACT();
//below goes code get value of each attribute of BPM from string
}
else if(obj.indexOf( "DRUG")!=-1){
//similar code to create BO DRUG
}
Don't forget to create BO before using those :)
This is what I am doing: I am building a fun in house API Voting System. I am using a client side snippet insert onto page
Like this:
<script src="domain.com/api/scripts/main.js"></script>
<div id="content-wrap" id="ac1e435e-c564-48f8-9f45-338616e7a789"></div>
Now in my main .JS I do all ajax request and modify the #content-wrap with creating new elements and inserting additional JS required to run Voting System.
However big issue I am experiencing is when I write JavaScript that I need to insert into #content-wrap I am currently writing it like this:
script.innerHTML = "$(someting).on('click', funciton(){"
+ "$.ajax({type: 'post',"
+ " url: '" + base + "/api/request', data: $('form').serialize(), "
+ "success: function(response){";
As you can see that can cause lot of issues as I build on it.
What is better way to accomplish this or is there a way i can just write my script / code and do something like this.
script.innerHTML = ConvertToString(script.js) OR ConvertToString(function X);
ConvertToString is just an expression I am using to explain what I would like to do instead of what I am doing.
Thank you, I am open to any suggestions.
I also must do this in plain JavaScript or with jQuery library so any suggestions to use VueJs, AngularJS or React will be considered as future references.
Thank you again
Additional explanation:
I would like to insert into my script element JavaScript snippet. But my snippet is about 30 lines long currently and might get bigger with time so it is very difficult to code with all the + " code " on every line that I write so that it can be inserted with innerHTML into element and executed on Client end.
So I would instead like to do something like this
element.innerHTML = mysnippetcode // but with out using + "" on each line like shown above
OR
element.append(snippet)
I hope this makes it little more clear
Solution that worked for me was using back ticks to wrap my sinppet and insert it into innerHTML of the element..
Just use the function's name without the () to convert it to a string:
function foo() {
var a = 10;
var b = 20;
var c = a + b;
return c;
}
document.write(foo);
The document.write will result in this string:
function foo() { var a = 10; var b = 20; var c = a + b; return c; }
If you only want the function's body, then you could just normally remove the first and last characters of the string.
I am not entirely sure this is what you wanted, if not, please make yourself more clear.
Alternatively, you could do an eval([insert function code here]) and there would be no need to add the code to the innterHTML of the script, read up on that function if you haven't heard of it.
Or if you want to create a function from a string, you can use new Function([name] ,[function body string]) if you need arguments you have to sandwich them between the 2 parameters.
But my snippet is about 30 lines long currently and might get bigger with time > so it is very difficult to code with all the + " code " on every line that I
write
You can use template literals if you want multi-line strings in Javascript, you simply have to replace your quotes with backticks.
See this MDN page if you are interested, or even this StackOverflow answer.
I've had a look around and can't seem to find a working solution, so here's the requirements.
I'm building a system that takes data from a master page and loads it into a modal style window for quick data processing. I have a javascript function passing 4 status parameters, and whilst 3 of them will always be integers, one of them can be integer or string.
The function works if all 4 parameters are integer, but fails when a string is passed.
function passJob(jobid,equipid,status,location) {
var a = document.getElementById('jobnumber');
var b = document.getElementById('equipid');
var c = document.getElementById('status');
var d = document.getElementById('location');
a.value = jobid;
b.value = equipid;
c.value = status;
d.value = location;
}
PHP
<a href='#' onclick='passJob($sr,$eid,$ss,$sl);'>Modify Job</a>
$sr, $ss and $sl will always be numeric, $eid will either be integer, or a string starting with M and then having a number after it.
I've tried adding quotes to the variables, around the variables, inside the function etc and no luck :(
You need to pass as string if you do not know what they are - also make sure you do not nest the same type of quote:
onclick='passJob($sr,"$eid",$ss,$sl);'
Just wrap it in quotes. This treats it like a string at all times to avoid any potential JavaScript parsing errors.
Modify Job
That is because you do not properly encode the variables in a Javascript notation. Try:
echo "<a href='#' onclick='passJob(".json_encode($sr).",".json_encode($eid).",".json_encode($ss).",".json_encode($sl).");'>Modify Job</a>";
Do like below
Modify Job
The following code is working but extremely slow. Up till the search function all goes well. First, the search function returns a sequence and not an array (why?!). Second, the array consists of nodes and I need URI's for the delete. And third, the deleteDocument function takes a string and not an array of URI's.
What would be the better way to do this? I need to delete year+ old documents.
Here I use xdmp.log in stead of document.delete just te be safe.
var now = new Date();
var yearBack = now.setDate(now.getDate() - 365);
var date = new Date(yearBack);
var b = cts.jsonPropertyRangeQuery("Dtm", "<", date);
var c = cts.search(b, ['unfiltered']).toArray();
for (i=0; i<fn.count(c); i++) {
xdmp.log(fn.documentUri(c[i]), "info");
};
Doing the same with cts.uris:
var now = new Date();
var yearBack = now.setDate(now.getDate() - 365);
var date = new Date(yearBack);
var b = cts.jsonPropertyRangeQuery("Dtm", "<", date);
var c = cts.uris("", [], b);
while (true) {
var uri = c.next();
if (uri.done == true){
break;
}
xdmp.log(uri.value, "info");
}
HTH!
Using toArray will work but is most likely were your slowness is. The cts.search() function returns an iterator. So All you have to do is loop over it and do your deleting until there is no more items in it. Also You might want to limit your search to 1,000 items. A transaction with a large number of deletes will take a while and might time out.
Here is an example of looping over the iterator
var now = new Date();
var yearBack = now.setDate(now.getDate() - 365);
var date = new Date(yearBack);
var b = cts.jsonPropertyRangeQuery("Dtm", "<", date);
var c = cts.search(b, ['unfiltered']);
while (true) {
var doc = c.next();
if (doc.done == true){
break;
}
xdmp.log(fn.documentUri(doc), "info");
}
here is an example if you wanted to limit to the first 1,000.
fn.subsequence(cts.search(b, ['unfiltered']), 1, 1000);
Several things to consider.
1) If you are searching for the purpose of deleting or anything that doesnt require the document body, using a search that returns URIs instead of nodes can be much faster. If that isnt convenient then getting the URI as close to the search expression can achieve similar results. You want to avoid having the server have to fetch and expand the document just to get the URI to delete it.
2) While there is full coverage in the JavaScript API's for all MarkLogic features, the JavaScript API's are based on the same underlying functions that the XQuery API's use. Its useful to understand that, and take a look at the equivalent XQuery API docs to get the big picture. For example Arrays vs Iterators - If the JS search API's returned Arrays it could be a huge performance problem because the underlying code is based on 'lazy evaluation' of sequences. For example a search could return 1 million rows but if you only look at the first one the server can often avoid accessing the remaining 999,999,999 documents. Similarly, as you iterate only the in scope referenced data needs to be in available. If they had to be put into an array then all results would have to be pre-fetched and put put in memory upfront.
3) Always keep in mind that operations which return lists of things may only be bounded by how big your database is. That is why cts.search() and other functions have built in 'pagination'. You should code for that from the start.
By reading the users guides you can get a better understanding of not only how to do something, but how to do it efficiently - or even at all - once your database becomes larger than memory. In general its a good idea to always code for paginated results - it is a lot more efficient and your code will still work just as well after you add 100 docs or a million.
4) take a look at xdmp.nodeUrl https://docs.marklogic.com/xdmp.nodeUri,
This function, unlike fn.documentUri(), will work on any node even if its not document node. If you can put this right next to the search instead of next to the delete then the system can optimize much better. The examples in the JavaScript guide are a good start https://docs.marklogic.com/guide/getting-started/javascript#chapter
In your case I suggest something like this to experiment with both pagination and extracting the URIs without having to expand the documents ..
var uris = []
for (var result of fn.subsequence(cts.search( ... ), 1 , 100 )
uris.push(xdmp.nodeUri(result))
for( i in uris )
xdmp.log( uris[i] )
I hava a url like
mysite.net/home/index/page/XX
while XX is any number. I need to replace XX and remove everything that might be behind XX. So I would like to remove everything behind page/ by replacing it with a number.
There are a lot of methods for string manipulation http://www.w3schools.com/jsref/jsref_obj_string.asp
I know how to perform this but I am not sure which methods to use. So I ended with getting the lastIndexOf("page/"). So this +1 would give me the starting point for replacing the string. The entire length of the string would be the ending point.
Any ideas?
The following code will do the trick, by using regular expression:
"mysite.net/home/index/page/XX".replace(/\/page\/.*/, '/page/123')
var url = "mysite.net/home/index/page/XX"
return url.substr(-(url.length - (url.lastIndexOf("page/") + 5))))
I don't get your problem because you may have found everything you need...
var yourURI = "mysite.net/home/index/page/XX";
var theDelimiter = "page/";
var yourNewIndex = "42";
var yourNewURI = null;
var lastIndexOfDelimiter = yourURI.lastIndexOf(theDelimiter);
if (lastIndexOfDelimiter != -1)
{
yourNewURI = yourURI.substr(0, lastIndexOfDelimiter + theDelimiter.length) + yourNewIndex;
}
Is that what you want?
This isn't a direct answer to your question, but the way I solve this kind of problem is to have the server calculate a 'base url' (mysite.net/home/index/page/ in your case), and write it to a js variable at the time the page is built.
For two different ASP.NET MVC versions (there would be something similar you could do in any other framework) this looks like this:
var baseUrl = '#ViewBag.BaseUrl';
or
var baseUrl = '<%: ViewData["BaseUrl"] %>';
This has the big advantage that the page JS doesn't start to know about URL formation, so if you change your URL routing you don't find little breakages all over the place.
At least for ASP.NET MVC, you can use the frameworks routing API to generate the base URL at the server side.