FAQ Database Discussion Community


JS - Call function by name (in object notation)

javascript,window,eval,object-notation
I want to clean up some old code and optimize it, which often uses the same code. (with only different names of functions to call) I make a easier example and no, I don't write on a game. But this example looks more comprehensible to explaination of my issue. character.sleep(1);...

How to control
  • list item visibility using Eval [closed]
  • asp.net,eval
    In an unordered list the visibility of individual list items can be set thus: <li runat="server" visible=false>Apples</li> or: <li runat="server" visible="false">Bananas</li> But why can't this be done using the 'Eval'method? None of these work: <li runat="server" visible='<%# Eval("Show")%>'>Carrots</li> --where Show is a bit that has values of 0 or 1....

    Save a dictionary key as a variable

    python,dictionary,multidimensional-array,key,eval
    I'm working on a small framework and I've found a place where it would be beneficial to save a dictionary key as variable. The problem I have is that the dictionary may have any number of layers, so it's not just a case of storing the final key. For example...

    `instance_eval` and scopes

    ruby,eval,instance-eval
    I have the following code: class A def self.scope yield end def self.method_added method self.instance_eval %{ # do something involving the added method } end end class B < A scope do def foo end end end When the method_added hook is fired, will the code inside instance_eval run within...

    What's wrong with `var myEval = eval; myEval(“2+2”)`

    javascript,eval
    As per MDN-EVAL You cannot indirectly use the eval function by invoking it via a name other than eval(); if you do, a runtime error might occur. For example, you should not use the following code: var x = 2; //1 var y = 4; //2 var myEval = eval;...

    undefined local variable or method after eval when not declared before

    ruby,eval
    In Ruby 2.1.2 :068 > a=1 => 1 2.1.2 :069 > eval("a=4") => 4 2.1.2 :070 > a => 4 2.1.2 :071 > eval("b=4") => 4 2.1.2 :072 > b NameError: undefined local variable or method `b' for main:Object So,the question is why the variable 'b' will be 'undefined local...

    How to use Eval() data in a method within a repeater

    c#,asp.net,eval,repeater
    I've written a method that checks and returns the status code of a URL. Then I used a repeater to grab rows from my db. What I'm trying to figure out is how to use the data returned in the repeater in a method called within the repeater. Here's the...

    Using eval to print an array value

    php,arrays,eval
    $cars = array ( array("Volvo",22,18), array("BMW",15,13), array("Saab",5,2), array("Land Rover",17,15) ); $key = '[1][0]'; $str = '$cars'.$key; echo $str."\n"; eval($str); Output: $cars[1][0] PHP Parse error: syntax error, unexpected end of file in ... : eval()'d code on line 1 I'm expecting it to print the value, i.e BMW...

    How to De-Stringify Stringified JavaScript?

    javascript,parsing,eval,stringify
    How to 'de-stringify' JavaScript code that has been stringified? JSON.parse does not seem to work. We want to store JavaScript code in the database and then retrieve it and then eval it. Here's the code in the database: //# sourceURL=journal.js function onBlur(e) { var drAmount = script.getGridRowFieldValue('debitamount', e.rowuid) var crAmount...

    Remove quotation marks from an object

    ruby,string,eval
    I want to call User.first, but I get it like "User.first". How can I strip the quotation marks so I can call User? Using a regex like this: gsub!(/\A"|"\Z/, "") returns nil instead of the expression.

    How to concatenate period in eval ASP.net

    html,asp.net,eval
    I have a ASP.net Label whose Text is defined as follows Text='<%# Eval("Price", "{0:&pound;0.00 ex. VAT}") %>' This displays the label as follows ignoring the 'period' between ex and VAT. How do i handle this? £99.99 ex VAT...

    Using eval() to check if global variable isset

    php,eval,constants
    I am trying to check defined variables based on passing a single portion of the variable. (The rest of the variable is static and all other portions of it are the same), so I made a test to find out if this is possible. It does not work, but perhaps...

    Evaluate expression in R data.table

    r,eval,data.table
    I have the following data.table: > dt = data.table(expr = c("a + b", "a - b", "a * b", "a / b"), a = c(1,2,3,4), b = c(5,6,7,8)) > dt expr a b 1: a + b 1 5 2: a - b 2 6 3: a * b 3...

    Dynamically Generating Code

    ruby,dynamic,methods,eval
    I have a whole bunch of similarly-structured methods, each of which look something like this: def my_method_1 if params[:user_id] #code that stays the same across my_method_1, 2, 3, 4, etc. #code that varies across my_method_1, 2, 3, 4, etc. elsif params[:tag_id] #code that stays the same across my_method_1, 2, 3,...

    How can I create an array assignment from HEREDOC text using PHP?

    php,arrays,eval,variable-assignment,heredoc
    I have a list of strings I need to convert into an array assignment eg lets say I have a set of lines like this: ctools_export_ui_list_form masquerade_block_1 switchtheme_switch_form backup_migrate_ui_manual_backup_load_profile_form backup_migrate_ui_manual_backup_form I need to create a variable assignment like this: $conf['journal_form_ids'] = array( 'ctools_export_ui_list_form' => 0, 'masquerade_block_1' => 0, 'switchtheme_switch_form' =>...

    in R, what is the difference between get(“abc”) and eval(parse(text=“abc”))

    r,parsing,eval
    I'd like to know the difference(s) between those two operations; in this example, they seem to work the same, but there must be situations where one will work and the other not. I just can't figure out when this would be the case. > a <- 298 > eval(parse(text =...

    Converting string into lambda/value

    scheme,eval,racket
    I want the following code to work: (define fn.str "(lambda (x) (displayln x)") (define fn.callable (string->lambda fn.str)) ; and then 2 next lines should be valid (fn.callable 123) (apply fn.callable '(321)) But best I can get is to eval string and get output, instead my target is to get the...

    Calculate Dice Roll from Text Field

    java,random,eval,jtextfield,dice
    QUESTION: How can I read the string "d6+2-d4" so that each d# will randomly generate a number within the parameter of the dice roll? CLARIFIER: I want to read a string and have it so when a d# appears, it will randomly generate a number such as to simulate a...

    Store php code rules in database

    php,mysql,eval
    Currently Im designing db and architecture of a web-site with delivery providers. Some providers have static delivery price, there are no problems, but some of them have dynamically calculated price. For example: if ({{item_type}} == 1) $price = {{default_price}} - {{default_price}} * 0.5; else $price = {{default_price}}; // {{...}} values...

    Emacsclient crashes when evaluating window functions

    emacs,window,eval
    To not bore anyone here with specifics, whenever I evaluate an expression similar to this one: emacsclient -t -e '(set-buffer *scratch*)' the client will flash up on the terminal and crash. This seems to be happening with all window-changing functions. Is the client not supposed to work like that? Running...

    How to avoid using JavaScript eval() in user-defined function

    javascript,json,eval
    I'm trying to make a generic table-top RPG helper web app. It has to be generic because Wizards of the Coast is very protective of their copyrights. So, in order to avoid cease-and-desists, the system has to be capable of loading arbitrary rules. That said, my buddies and I (along...

    Foreach loop unable to find object

    r,foreach,parallel-processing,eval
    I am trying to use foreach with the parallel backend to speed up computation (of cross validation of an {AUCRF} random forest for feature selection, if this does matter). In the process of doing so i need to get a subset of a vector. The name of the vector can...

    Issue with Expression in For Loop - Bash

    bash,for-loop,expression,eval
    I am trying to loop through a list of servers and rather than manually enter each one in a text file, I wanted to use an expression. Example: [[email protected] ~]$ for i in server{001..010} ; do echo $i ; done server001 server002 server003 server004 server005 server006 server007 server008 server009 server010...

    What are the limits to inheritance in ggplot2?

    r,ggplot2,eval
    I have been trying to work out a few things about ggplot2, and how supplemntary arguments inherit from the first part ggplot(). Specifically, if inheritance is passed on beyond the geom_*** part. I have a histogram of data: ggplot(data = faithful, aes(eruptions)) + geom_histogram() Which produces a fine chart, though...

    Using Javascript's eval() on HTML Text

    javascript,html,eval
    I am toying around with some basic constructs in HTML and Javascript (i.e., I am a HTML/Javascript n00b), and there is a feature I simply cannot seem to implement properly. In a nutshell, I'd like to grab text from the body of an HTML page and evaluate it using Javascript...

    How can I break out segments of a 'PHP' file into raw PHP, -and- possible raw HTML -in order-

    php,html,regex,eval,output-buffering
    So I've got a concept of how to do this - but actually implementing me is a bit of a stumper for myself; mostly due to my lack of regex experience - but let's get into it. I'd like to 'parse' through a 'php' file that could contain something like...

    Format both an expression and its result without eval

    common-lisp,eval
    I am trying to format an arbitrary expression, say (+ 2 3), and at the same time, its result, 5. I have the following: (defun expr-and-result (expr) (format t "~a returns ~a~%" expr (eval expr))) CL-USER> (expr-and-result '(+ 2 3)) (+ 2 3) returns 5 Though it's a simple matter...

    eval string as an array

    php,arrays,eval
    I have a .html file which contains the following: array('1', '786286', '45626'); That is literally all it contains. In my code, I want to eval this and then print it: $code = file_get_contents('array.html'); $nums = eval($code); print_r($nums); However, it is not printing anything. Any help would be greatly appreciated....

    ast.literal_eval not working (python string of list to list)

    python,string,list,eval,abstract-syntax-tree
    I am trying to convert the following string of a list back to a list. [('zX7XjZ1Vwai5UbqNDDJ1NQ', 570512, [155])] I have tried both eval() and ast.literal_eval but for some reason when I print the type of my converted string it is still a string (but with the quotations removed) I have...

    <%#Eval %> in asp.net to move page

    html,asp.net,http,hyperlink,eval
    Like other 'List' page, I'm making a <a> tag on td, and 3buttons 'Go up','Go down','Go list'. I succeed after click this link, go another page. <a href="NoticeDetail.aspx?seq=<%#Eval("Seq") %>"><%#Eval("Title")%></a> Now, the problem is here. To make Go up/down pages, I guess put the number +1 on the link to calculate...

    How can I use vim regex to replace text when math divide is involved in the expression

    regex,vim,eval
    I am using vim to process text like the following 0x8000 INDEX1 .... 0x8080 INDEX2 .... .... 0x8800 INDEXn .... I want to use regular expression to get the index number of each line. that is 0x8000 ~ 0 0x8080 ~ 1 .... 0x8800 ~ n The math evaluation should...

    Php: json to constants

    php,eval,constants
    I have a Json that contains a few contants I'd like to auto-define. It works fine with simple "key": "val" statements, but I can't make it work for eval staments: $cat test.php <?php function objDefinition($obj) { foreach ($obj as $key => $val) { $val = $val; \define($key, $val); } }...

    Is this eval() in python safe?

    python,eval,code-injection
    consider this code: from re import sub input = request.POST['input'] sub_pattern = {'1':"sub('pattern1','txt1',input)", '2':"sub('pattern2','txt2',input)", } eval(sub_pattern['1']) is there code-injection in this code? can you provide POC on this code injection?...

    converting string to tuple in python

    python,string,tuples,eval
    I have a string returnd from a software like "('mono')" from that I needed to convert string to tuple . that I was thinking using ast.literal_eval("('mono')") but it is saying malformed string....

    R convert character to dataframe column name and then replace values in a column

    r,eval,assign
    I was able to get content of the column pointed by character variable b. But i want to make column emp 0. How could i do that? emp=c(1,2,30) abc=data.frame(emp) b="emp" #below line gives content of column emp eval(parse(text=paste("abc$", b, sep = ""))) #how can i replace each value in column...

    How to use this javascript code with eval or in a iim file?

    javascript,eval,imacros
    I want to use this code with eval or in a iim file without using js file.I tried for using it into eval but didn't work.Or is there any other way that can allow this code into iim file directly? please help me! do { do { iimPlay("CODE:ondialog pos=1 button=ok...

    appending multiple similar functions to protoype

    javascript,node.js,eval
    I want to avoid redundant code for one of my projects, which is a simple logger. This logger needs functions like *.alert, *.notice, etc. and I also decided to assign aliases to them (.alert = .al, etc.). This leads to multiple similar functions, that only differ by one number, and...

    Alternative for eval() function for this codeblock

    javascript,jquery,html,html5,eval
    I am working on a HTML code editor like JSBin. I am using eval() to evaluate the JavaScript in a JS textbox of the editor. However, I came to know that I can't use it online due to security issues. Please help me in finding the alternative. Here's my code....

    Eval not working on multi-line string

    python,eval
    I am having issues with executing a multi-line string with the python eval function/ code = ''' def main(): print "this is a test" main() ''' eval(code) Traceback (most recent call last): File "<pyshell#12>", line 1, in <module> eval(code) File "<string>", line 3 def main(): ^ SyntaxError: invalid syntax ...

    What is an alternative to using 'eval' to accessing a variable by name to “sync” it with another?

    javascript,eval
    I want to keep two JavaScript variables in sync when I run a function. The variable that is to be pointed to is in an object. The code I have so far is this: var myname = "bob"; var thevar = ""; var varobj = {tvar: "myname"}; var syncvar =...

    clojure quoting inside let

    clojure,macros,eval
    Quoting (both syntax and non-syntax) seems to fail to detect vars inside a let statement: (let [foo 1] (eval `(print foo))) This will generate an error or use whatever prior value bound was bound to foo in (def foo bar). Is there a way to make the syntax quote use...

    Parse a string expression

    python,regex,parsing,expression,eval
    I need to parse a string which contains an expression. The language is proprietary and I am not sure I know the complete syntax but essentially an example expression looks like this: "some_name+(some_other_name * 4 * different_name)+ 'h40028" There are various names i've illustrated as some_name etc above which I...

    Dynamically created layer names, problems with eval()

    eval,layer,openlayers-3
    I want to create some layers with names taken from database. "Trees" in database becomes a "Layer_Trees" openlayers layer. I tried many things with eval function, yet with no success. Seems like its completely uncapable of defining new variables. function addLayer_ImageWMS(SourceName,SourceLayerName) { LayerName="Layer_" + SourceLayerName; eval(LayerName) = new ol.layer.Image({ title:...

    How does str(list) work?

    python,string,list,eval,python-internals
    Why does str(list) returns how we see list on the console? How does str(list) work? (any reference to the CPython code for str(list))? >>> x = ['abc', 'def', 'ghi'] >>> str(x) "['abc', 'def', 'ghi']" To get the original list back from the str(list) I have to: >>> from ast import...

    How to evalulate xml literal using scala.tools.reflect.ToolBox in runtime?

    xml,scala,reflection,eval
    Welcome to Scala version 2.11.6 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_25). Type in expressions to have them evaluated. Type :help for more information. scala> import scala.reflect.runtime.currentMirror import scala.reflect.runtime.currentMirror scala> import scala.tools.reflect.ToolBox import scala.tools.reflect.ToolBox scala> def eval(code: String) = { | val toolbox = currentMirror.mkToolBox() | toolbox.eval(toolbox.parse(code)) | } eval:...

    Parse Perl range string such as “1,4..7,10,11” [duplicate]

    perl,parsing,eval
    This question already has an answer here: Is there a Perl module for parsing numbers, including ranges? 1 answer Given a string such as 1,4..7,10,11, is there a neat way to parse it into the list (1,4,5,6,7,10,11)? The string is given as a command-line argument. My plan is ensure...

    How to convert a statement in a string into a format that can be evaluated (Ruby)

    ruby,string,eval
    I am writing a quiz program where I need to store boolean statements as strings in an array and output them to the terminal as part of a question. I then want to evaluate the contents of these strings and return the value so that I can test whether I...

    Perl sigdie handler and eval

    perl,eval,log4perl
    I am overriding my SIG die handler as below inside my Logger module. # Catch die messages and log them with logdie $SIG{__DIE__} = \&logdie; Now below program run as expected and post processing will be called. use strict; use warnings; use File::Path; # use MyLogger; my $dir="/random"; eval {...

    is there a way to avoid eval() to accomplish dynamic dispatch of a function specified in a list in python

    python,eval
    I have a list as defined here: header_fields = [ ['delim',0,4,'strip()'], ['qual',4,5,None], ['NLS_CODE',6,25,'strip()'], ['source_system_id',26,45,'strip()'], ['extract_name',46,65,'strip()'], ['extract_serial_number',66,85,'strip()'], ['file_counter',86,88,"lstrip('0')"], ['total_file_count',89,91,'strip()'], ['extract_run_date_time',92,126,'strip()'], ['from_date',127,161,'strip()'], ['thru_date',162,196,'strip()'], ['number_of_rows',197,216,'strip()'], ['data_recons1',217,246,'strip()'],...

    Use of eval when building a dict in a for loop. Name is not defined

    python,dictionary,eval
    Mostly curious why this syntax isn't behaving in the way I would expect it to. Inside of a class's init which accepts multiple parameters (id, departmentId, active), I have the following variable: attributes = [ {'id': 5}, {'departmentId': 10}, {'active': True} ] Essentially, I'm trying to build a dictionary where...

    Not able to do Class(argument) with eval in ruby

    ruby,eval,metaprogramming
    I have a function like this: def check_if_correct_type(type, value) # nil.test! # eval(type.classify(value)) rescue return false # true case type when "integer" !!Integer(value) rescue return false when "float" !!Float(value) rescue return false else return true end true end A sample would be check_if_correct_type("integer", "a") I tried changing the function like...

    How to call code behind function from label.text in asp.net

    c#,asp.net,eval,code-behind
    I am trying to call a function defined in code behind from Label.Text but it's not working. Here is the code... code in .aspx file <asp:Label runat="server" Text='<%# GetPagingCaptionString() %>' ID="pagenumberLabel"></asp:Label> code block from code behind public string GetPagingCaptionString() { int currentPageNumber = Convert.ToInt32(txtHidden.Value); int searchOrderIndex; if (int.TryParse(Convert.ToString(Session["searchOrderIndex"]), out searchOrderIndex))...

    How to evaluate custom javascript expression with the context in strict mode?

    javascript,properties,scope,this,eval
    Update I've come up with a concise solution to this problem, that behaves similar to node's vm module. var VM = function(o) { eval((function() { var src = ''; for (var prop in o) { if (o.hasOwnProperty(prop)) { src += 'var ' + prop + '=o[\'' + prop + '\'];';...

    Can an inserted