I am sure there is something simple that I am missing but I am stumped here.
The issue is that I am looping through an array of strings and using the string value to search for a part of that string using indexOf. The first time around the loop the index of is finding what I am looking for but the second time it is not.
Here is a fiddle - http://jsfiddle.net/jeremywrags/uSwjG/1/
the line that seems to be not working is this
var aliasIndex = fromclause.indexOf(" " + tableAlias + " " );
I am trying to build a SQL parser for a cloud app and the use case here is that when a table is aliased I need to get the original table name so that I can look up the table columns. The first time around the loop index of returns the index and then the table name. The second time around the index of is -1 and the table name is not retrieved.
If I need to provide more context please let me know.
thanks
It's not matching because on the second pass, tableAlias is the string " b" (note the space). So then you search for " b " (note two leading spaces), which isn't there.
Rather than using alert, use the debugger built into your browser. You can set breakpoints in the code, step through line by line, inspect variables, etc., etc. Doing that with this would have shown you, when looking at the variable tableAlias, that it had a leading space, hopefully helping you find the solution.
Here's what that looks like in Chrome's debugger, for instance:
(If you look at the jsFiddle source above the actual debugger's version, you'll see a debugger; statement in the code — normally you don't need that statement, you can just open your page, use the "Sources" tab to find your JavaScript file, navigate to the line, and click the margin to the left of it to set a breakpoint. But sometimes [for instance, when using jsFiddle], the debugger; statement is handy. What it does is, if the debugger is open, halts execution of the code at that point like a breakpoint does.)
Related
I've created a JavaScript live template which I use a lot in WebStorm:
console.log('$PARAM$ -> ', $PARAM$);
It helps me type this kind of lines faster:
console.log('nextProps -> ', nextProps);
However as it starts on the first $PARAM$ I don't get autocomplete. Is there a way to get the cursor to the second $PARAM$ while keeping the duplicated text adding?
Use 2 variables instead of 1
Reorder them -- 2nd one should be filled first
Tell IDE to auto-copy 2nd variable into 1st
Tell IDE to ignore 1st variable if it has value (which it will because of #3)
console.log('$PARAM1$ -> ', $PARAM2$);
I have a text area that accepts line breaks. The content of that text area is saved in a coldfusion variable (lets call it #fieldVal#). So, my variable contents look like
textline 1
textline 2
Later on, I use that variable in JavaScript
document.all.fieldName.value = "#fieldVal#";
However, when the JavaScript hits the page, it looks like this:
document.all.fieldName.value = "textline 1
textline 2";
and the script breaks because the first line doesn't end in a semicolon.
I tried setting a JavaScript variable to the ColdFusion text then doing a replace(), but I still hit the same issue with the line not ending correctly.
I think I'm missing something obvious but I am just not seeing it. Can someone tell me what I'm missing here?
Use the JSStringFormat() function. It is designed to escape meta characters in JavaScript
Escapes special JavaScript characters, such as single-quotation mark,
double-quotation mark, and newline.
https://wikidocs.adobe.com/wiki/display/coldfusionen/JSStringFormat
document.all.fieldName.value = "#JSStringFormat( fieldVal )#";
If you're using ColdFusion 10+ or Lucee Server, use EncodeForJavaScript().
https://wikidocs.adobe.com/wiki/display/coldfusionen/EncodeForJavaScript
Option 1
document.all.fieldName.value = "#Replace(trim(fieldVal), chr(10) & chr(13), ' ', 'ALL')#";
Option 2 (Possible that the same issue occur in this too.)
Try using ToScript()
ToScript(fieldVal, valueVar)
Toscript initializes a variable with the coldfusion variable value and you can use like any JS global variable.
document.all.fieldName.value = valueVar;
Option 3 (If you need in HTML form)
Use coldfusion function ParagraphFormat() which changes line breaks into <br/>.
I stumbled upon a code snippet that worked. Its a bit...convoluted, but it works.
document.all.fieldName.value = "#Replace(Replace(URLDecode(Replace(Replace(URLEncodedFormat(fieldVal), "%0D", " ", "ALL"), "%0A", "", "ALL")),CHR(34),"", "ALL"),CHR(39),"", "ALL")#"
I'm a beginner in jquery and ajax. While i was going through some example online, i came across the following piece of code and wondered what exactly it does.
lines = newLine.split('#');
jQuery.each(lines, function(lineNo, line) {
eval("linedata = " + line);
data.push(linedata);
});
I'm not a programmer, but just trying to understand its functionality. Can anyone help me?
The each function iterates over an array which is supplied as the first parameter. During each iteration the index and element are passed into a function that is performed. The function is passed as the second parameter to the each function.
Read more on the jQuery Documentation
In the example you have provided a string newLine is split into an array using # as the delimiter.
The each function then iterates over the newly created array, assigning the value of each element to a variable linedata and pushes linedata onto another array.
This could be more easily achieved with the following, since the call to eval is unnecessary:
jQuery.each(lines, function(lineNo, line) {
data.push(line);
});
I pretended, for a moment, that I was a new programmer. This is how you should go about looking into things from here on out:
1.) Ok, I don't know what this first line is doing. It's splitting something (based on the split word). Hmmm let's Google for "split javascript". This is the first thing that comes up. From here, you may be wondering what a String is, so you would search for that as well).
2.) Ok so now I know that splitting a String gives me an array (again you probably looked this up by this step) of the newLine substrings that were separated by the # character. Cool. So let's look into what jQuery.each does. I google "jQuery.each" and this is the first thing that comes up.
Awesome! Now you understand what a String is, an Array, the split function from String as well as what jQuery.each is. :D
EDIT: As you move forward, you'll realize that W3C is generally an inferior source of information. I simply linked to it since it was literally the first thing that came up when I Googled "split javascript". Overall it does the job for giving you a good overview of certain things when you're learning them for the first time.
First of all, I've done my research and I did find a bunch of simialr questions. However, I didn't find an answer that applies to my problem. All the examples I found were related to unescaped characters, single/double quote mishaps and the like. I on the other hand am getting this error on the following function:
$('.seq_input').blur(function(){
//var id = $(this).data('id');
//var index = parseInt($(this).val()),
//element = $("#test-list li").eq(id).remove();
//$("#test-list li").eq(index - 1).before(element); // -1 because users like 1 based indices
alert('what?');
});
As you see I commented out everything and just left an alert, and I'm still getting the error, pointing to the last line of the function. It couldn't have anything to do with other functions because I just added this one alone at the end of my current Javascript.
Can someone please tell me what's going on here? Why on Earth would a function that just alerts something (or even if it doesn't do anything) give an error?
NOTE: error is shown as soon as the page is loaded
There are invisible characters between the trailing semicolon and the parenthesis. I concatenated your code, put it in a string, and called a non-existent function in order to trigger a error (using this method).
'});'.l()
>>> TypeError: "})\u200B\u200B\u200B;".l is not a function
$('.seq_input') may used on the other functions, try using new id to do that function.
The page having problems is...
http://schnell.dreamhosters.com/index.php?page=gallery#
I use Firebug to debug my jQuery and other code tidbits and it's been proving very useful for Javascript/jQuery debugging. However, at the same time, it's been one of the most frustrating debugging experiences I've ever gone through. I'm not sure why but sometimes it seems like I can copy someone else's methodology from a tutorial, character for character, and yet still come up with errors.
In any case, the problem here is that Firebug claims there is a bug on line 20 of the source.
missing : after property id
[Break on this error] $('#table').animate({"left: " + attr + "px"}, 2000);\n
This bug seems like a huge load to me because the colon is right there! And this is why debugging jQuery/Javascript is such a pain sometimes. The error messages are rather convoluted and sometimes don't even make a lick of sense to me. Or maybe that's just Firebug.
Either way, the goal I'm going for here is that I'm trying to dynamically change the animate function such that the more you click the left arrow, the further left the grid of images is shifted (due to the nature of the CSS 'left' property). I have Javascript variables and a hidden input tag to help hold essential values, but the major hurdle is getting the animate function to recognize these variables. Near as I can tell it will only accept string literals for arguments on how to animate and the documentation doesn't help me because it doesn't discuss the use of variables with animate, as if it's impossible.
Well, let's just say I don't like impossible, he likes to get in my way a lot.
The object literal passed to the animate function is not well formed, it should be:
$('#table').animate({left: attr + "px"}, 2000);
Edit: Looking closely to your code, you are also trying to get a value from an input with id = "count", and you have a missing # character to have an ID selector:
var count = +$('#count').val(); // get #count value as Number
You are also incrementing this count variable, but you should first convert it to Number, because the value attribute of input elements are string. (I did it using the unary plus operator on the right-hand side of the assignment).
You have to convert it to a number, because if you add two variables and one of them is a string, concatenation will take place:
"1" + 1 == "11"
Try:
$('#table').animate({left: attr}, 2000);
The "px" units of measurement here aren't necessary. That aside, the above is the correct creation of an anonymous object. You were just putting a string inside curly braces.