parameter-passing | 易学教程

How to pass Variable from External JavaScript to HTML Form

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问题 I have been trying to pass a value from an external javascript file to an HTML form with no luck. The files are rather large so I am not sure I can explain it all but ill try. Basically a user clicks a link then a js file is initiated. Immediately after a new HTML page loads. I need this value passed to the HTML page in a form field. Javascript: var divElement = function(){ divCode = document.getElementById(div1).innerHTML; return divCode; }; document.getElementById('adcode').value =

How do I pass this array of c strings correctly? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I have my array of C-Strings declared as: char *argv[MAXARGS]; MAXARGS basically just tells us how many c strings are in the array for indexing purposes. I want to pass it to this function below... int builtin_cmd(char **argv) but nothing seems to go through, I called the function like this. char *argv[MAXARGS];

Function for applying to a user with a various number of data fields

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问题 The question was born when I was practicing an Observer topic in a tutorial I am trying to apply the function to the user but cannot use user's data fields like name, surname. Let's say that the user may have various number of data fields so we must use & args argument. My code that does not work: (ns observer.core) (def user {:name "Alan" :surname "Smith" :alias "Mike"}) (def user2 {:name "Jane" :surname "Smith"}) (apply (fn [& args] (println (str "I am " (:name args) " " (:surname args) "."

Detect if parameter passed is an array? Javascript [duplicate]

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Possible Duplicate: How to detect if a variable is an array I have a simple question: How do I detect if a parameter passed to my javascript function is an array? I don't believe that I can test: if (typeof paramThatCouldBeArray == 'array') So is it possible? How would I do it? Thanks in advance. if (param instanceof Array) ... Edit. As of 2016, there is a ready-built method that catches more corner cases, Array.isArray , used as follows: if (Array.isArray(param)) ... This is the approach jQuery 1.4.2 uses: var toString = param.prototype.toString; var isArray = function(obj) { return toString

Upsert in SQLite with running total if record is found

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问题 I would like to upsert data to a table in SQLite, but the column being updated (if the record is found) must be a running total. I am using a parameterized query, and am having trouble with the syntax. My understanding thus far is that COALESCE is the way to do an upsert in SQLite, so this is the skeleton of what I've got thus far: INSERT OR REPLACE INTO TABLE (ID, Quantity) VALUES (:ID, COALESCE(Quantity + :Quantity_change, :Quantity_change) In other words, if the record is found, add the

Passing NSString returning null in next ViewController

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问题 I am trying to pass an NSString from one view controller to the next . However I cannot seem to get it to function properly and I have set up a simple NSLog(@"%@", myString); before I try to [vc2 setString:myString]; which prints the correct string, and also in the second viewController and it is coming back as null so clearly I am doing something wrong. Here is my code. first viewController #import "DetailController.h" #import "City.h" #import "VideoController.h" #import "Helper.h"

How do I pass smart pointers into functions?

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When passing objects into functions, do the same rules apply to smart pointers as to other objects that contain dynamic memory? When I pass, for example, a std::vector<std::string> into a function I always consider the following options: I'm going to change the state of the vector object, but I do not want those changes reflected after the function has finished, AKA make a copy. void function(std::vector<std::string> vec); I'm going to change the state of the vector object, and I do want those changes reflected after the function has finished, AKA make a reference. void function(std::vector

jQuery Passing $(this) to a Function

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I have lines of code like this: $(this).parent().parent().children().each(function(){ // do something }); It works well. But I need to run these lines multiple times. So I have created a function and pass $(this) parameter to a function: myFunc( $(this) ); function myFunc(thisObj) { thisObj.parent().parent().children().each(function(){ // do something }); } But in this way, It didn't work. erimerturk you can check this link. http://jsfiddle.net/zEXrq/38/ $("#f").click(function() { myFunc($(this)); }) function myFunc(thisObj) { thisObj.parent().parent().children().each(function() { alert(

How exactly callbacks get their arguments?

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问题 I have trouble understanding how callbacks in JavaScript get their arguments. Or in other words: how to implement a higher-order function so its callback accepts for instance a standard err and data arguments. Like in this article on asynchronous JavaScript in the example of a callback used in a usual way (and I know it's usual because I see exactly this pattern used in Node.js moongose (i.e. for creating data in db)): function getData(options, callback) { $.get("example.php", options,

T-SQL - Using AND condition only if a value from a list is present

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问题 I want to add an AND condition in my query after the WHERE clause only if I find (a) value(s) from a list of predefined values, otherwise the condition should not be added. The condition I want to add here is "AND Table2.fieldvalue = importantvalue" only when a parameter value is present in a list of (1001, 1002, 1003, 1004, 1005, 1006, 1007) Also the parameter that comes in is a STRING with INT values comma separated but I have a user defined function to split and cast it into INT SELECT