I am having some trouble with some javascript and how it can control the html "text box".
First, here's what I have;
javascript:
function UpdateOrder()
{
// enable/disable appropriate buttons
document.getElementById("reset").disabled=false;
document.getElementById("add").disabled=false;
document.getElementById("submit").disabled=false;
document.getElementById("edit").disabled=false;
document.getElementById("update").disabled=true;
// Show display box, 'DispCurOrder'
document.getElementById('all_labels').disabled=true;
}
function EditOrder()
{
// enable/disable appropriate buttons
document.getElementById("reset").disabled=true;
document.getElementById("add").disabled=true;
document.getElementById("submit").disabled=true;
document.getElementById("edit").disabled=true;
document.getElementById("update").disabled=false;
document.getElementById('all_labels').disabled=false;
}
The Idea is simple... I have some buttons and inputs to generate a 'line' of text that get's dumped to the disabled text box. If the operator notices that they made a type-o or want to change something, they click on 'edit order' and it disables all the regular buttons, and enables the text box and 'update' button. The 'update order' button reverses this.
Now, when I just use the add lines to the text box, all works well. You can see each line get appended to the text box (there's another java function that does a bunch of error checking and such, but the crux is that it takes the contents of the text box, parses it on the "\n" to an array, then appends the new line of text. It then takes the array and puts it all together as a new string and puts it back into the text box. Here is that portion without all the error checking stuff;
function AppendOrder()
{
// let's set up an error flag.
var AppendError="";
var str1=document.forms["MyForm"].DataEntry1.value;
var str2=document.forms["MyForm"].DataEntry2.value;
if( /* checking variable str1 for errors */)
{
AppendError="Error in str 1 here";
}
if( /* checking variable str1 for errors */)
{
AppendError=AppendError+"Error in str 2 here";
}
// Display the error message, if there are no errors, it will clear what was there.
$('#AppendStatus').html(AppendError);
if(AppendError=="")
{
// it's all good, update the display
// create line of text
curEntry=str1 + " -- " + str2;
// let's get the current order into a list
str=document.getElementById('all_data').innerHTML;
if(str1=="Empty")
{
// make curOrder = to 1 element array of curEntry
var curOrder=[curEntry];
}
else
{
// parse str1 into an array and parse it to curOrder.
// Then push curEntry on the end.
var curOrder=str1.split("\n");
curOrder.push(curEntry);
}
// now we should have an array called 'curOrder[]'. Let's show it
// on the web page.
$('#all_labels').html(curOrder);
}
}
Now, the problem that I'm having is that after I add a line or two (or more) to the display using the 'add' button and then go into the 'edit' mode (where the text box is enabled) and I make all my changes, the 'add' button doesn't work.
Oddly enough, when I press the 'reset' button (which is just a reset button) it then shows all the adds I did after the edit, and the edited stuff is gone.
Now... to the question... is there something I'm not understanding about the text box? Is there some trick I need to do to get it to work? Am I going about this all wrong? Should I be using a different tool for this other than the 'textbox'?
Any help is greatly appreciated!!
Greg
Found the typo in your jsFiddle.
The first thing that I did was to add:
alert('hi there');
to the very top of the script, inside the $(document).ready() wrapper. Note that on jsFiddle you cannot see the document.ready wrapper, it is invisibly included, so just put the alert at top of javascript block as I did (link to my new jsFiddle is at bottom of answer)
Next, I noticed that you are enabling/disabling several controls by referencing them individually by ID. You can reference several controls at one time if they share the same class, so I invented the class="orderentry" and added that attribute to each of those controls. This removed 8 lines of code, which made troubleshooting easier.
Then, I began deleting/undeleting. First, I deleted everything in the javascript panel except alert('hi there');, and ran the jsFiddle. The alert popped up. Great. So I used Ctrl+z to undelete everything. Next, I selected everything EXCEPT the next block of code, and deleted the selection. I ran the jsFiddle, and again the alert popped up.
I continued deleting/undeleting until I found out where the alert no longer worked -- and that revealed the offending code block. Just had to carefully study the syntax in that specific area and found the error:
$('#txtOrder').attr({'disabled':'disabled')}; <== ERROR: note final parentheses
instead of
$('#txtOrder').attr({'disabled':'disabled'}); <== CORRECT: note final parentheses
Hope this helped, good luck on the rest of your project.
Here is the corrected jsFiddle
You didn't share your HTML, so I made assumptions about what your markup looks like.
Working jsFiddle here
The above jsFiddle is a much simplified version of what you are creating. Obviously, it is very different from what you have done so that I could create it quickly.
Observe how I made certain things happen with jQuery; take what is useful and ignore the rest.
Specifically, you can see how I initially disabled the textarea control:
$('#txtArea').attr({'disabled':'disabled'});
Re-enabled the textarea control for editing, while also hiding the Edit button and displaying the Save button:
$('#txtArea').removeAttr('disabled');
$('#btnSave').show();
$(this).hide();
Importantly, this is how I ensure each addition adds to (rather than overwriting) existing content:
var ord = 'Requested By: ' + $('#txtReq').val() + '\r\n';
Very likely you already know many (most?) of the things I am pointing out, but I have no idea what you know so, again, keep the one or two things you find useful and ignore the rest. I only hope I've managed to hit on the bit that has you stumped at the moment.
I very rarely recommend W3Schools for anything, but look here for their excellent summary / reference of jQuery selectors, events, methods. (Keep hitting Next Chapter to cycle through all pages of this reference).
Related
I've been doing tiny little projects to try to learn Javascript. When I was playing with Kahoot I noticed that even though it should be a different color ~25% of the time, it seems to be red the majority of the time.
I'm trying to make javascript code to put into the console that lets me automatically always choose red and then it records whether it was correct or incorrect.
To click red, I can do var red = document.getElementsByTagName("button")[0]; then red.click(), and to check if it's right or wrong I can do
if ((document.documentElement.innerText).indexOf('Incorrect') > -1) {
alert('Incorrect');
} else if ((document.documentElement.innerText).indexOf("Correct") > -1) {
alert('Correct');
}
This works... sometimes. I think I know the problem but I don't know how to fix it. The button red will disappear to display whether it was correct or incorrect, then it will pop back up.
Normally I can set the variable red, and it works, but the next time the button pops up and I set the variable again it says undefined. In order to fix this, I need to use inspect element to press "Edit HTML" then press Enter.
I think this helps because when it says undefined it's looking through an older version of the HTML, the one where the button is hidden, and when I edit the html it updates the html that the javascript is searching.
Edit: I'm bad at explaining, so here's a video on my problem: https://youtu.be/9WaIOPRny28
I have a .pdf document that contains custom links which run Javascript code.
There is no issue with the actual functionality of the working portion of the JS, but I do have one formatting/display problem that I havent been able to solve:
Is it possible to write JS that will alter the appearance of individual links as they are clicked?
I know I can programmatically change the appearance of all links on a page by looping through the doc.getLinks result and applying formatting changes to each element of the getLinks array. But I don't know how to refer to a specific link, as/after it's clicked, either by referencing that link's index location within the getLinks array, or by referring to it by any other name, handle, etc.
I would think that this is probably possible to do, but I'm at a loss.
Thanks in advance for any pointers!
EDIT: One thing to clarify...I can do everything I need to do for a single button. That is, I can manually find the button name, and manually enter the JS code to change the appearance of that particular button. To do this, I need to physically look up the name of the button using a few mouse clicks, and then hard code that button's name in my JS getField command. This requires different code for each and every button.
Is it possible to accomplish the same function using the same code for each and every button?
My ultimate objective is to be able to reproduce this function on a series of .pdf files that will, jointly, have thousands of individual buttons. So any manual component of this process will make implementation impractical.
I should have originally phrased the question in terms of, is it possible to write JS code that can automatically detect the name of the button which is calling the code? (ie, how would I implement a self-referential feature for a generic button?)
As wished by the OP…
When a script should refer to the field on which it is running, the field object to use is event.target.
An example:
You have a button which, when clicked, should change the width of the border between 1 and 3. The mouseUp event would containt this piece of code:
if (event.target.lineWidth == 1) {
event.target.lineWidth = 3 ;
} else {
event.target.lineWidth = 1 ;
}
Or another example: when the number in the calculated text field is negative, it should be in red, otherwise in black:
In the Format event of that field, you would add:
if (event.value*1 < 0) {
event.target.textColor = color.red ;
} else {
event.target.textColor = color.black ;
}
And that should give an idea on how to use event.target.
I really need to know how I can autofill text boxes on a web page.
What I really want to achieve is the following:
1) Go to http://show.websudoku.com
2) Replace all the empty cells with a 0 (zero).
Is that possible?
To fill the empty spaces of the Sudoku grid at http://show.websudoku.com with zero's, here is some JavaScript to do that. It is formatted for use as a "Bookmarklet":
javascript:(function(){var x,k,f,j,r;x=document.forms;for(k=0;k<x.length;++k){f=x[k];for(j=0;j<f.length;++j){r=(f[j].className.toLowerCase()+f[j].type.toLowerCase()+f[j].value);if(r=="d0text"){f[j].value="0";}else if(r=="d0text0"){f[j].value="";}}}})();
The setup:
Create a new Bookmark/Favorite. For now, the URL for the favorite can be anything. An easy way to do this is to drag ANY link/url from the browser address bar, or any web-page link, to the "Favorites Bar" or to the Bookmarks/Favorites sidebar.
Select the new favorite, and rename it to any name you like.
Copy the JavaScript code from above to the clipboard. It must remain as 1 continuous single line, and it must begin with "javascript:(" and end with ")();"
Edit the properties of the new favorite.
Remove the "URL" that is currently in the favorite and replace it by pasting in the JavaScript code from above, into the "URL" text field for the favorite, then save the changes.
To use the bookmarklet:
From the browser, navigate to http://show.websudoku.com as you normally would.
Click the new favorite (Bookmarklet) that you just edited.
All empty spaces in the Sudoku grid will be filled with 0's. Click the new favorite (Bookmarklet) again, and the 0's will be removed leaving empty spaces once again.
Here is what the Javascript code looks like expanded, with indents:
javascript:(function(){
var x,k,f,j,r;
x=document.forms;
for(k=0;k<x.length;++k){
f=x[k];
for(j=0;j<f.length;++j){
r=(f[j].className.toLowerCase()+f[j].type.toLowerCase()+f[j].value);
if(r=="d0text"){
f[j].value="0";
}
else if(r=="d0text0"){
f[j].value="";
}
}
}
}
)();
* Spoiler alert *
In case you want to "cheat", the JavaScript here will "solve" the Sudoku:
javascript:(function(){var x,k,f,j,ecl,etl,en,ev,s,e,c,d,dl,dr,n;x=document.forms;for(k=0;k<x.length;++k){f=x[k];for(j=0;j<f.length;++j){e=f[j];r=(e.name.toLowerCase());if(r=="cheat"){c=e.value;break;}}for(j=0;j<f.length;++j){e=f[j];ecl=e.className.toLowerCase();etl=e.type.toLowerCase();en=e.name;ev=e.value;if(etl=="text"){if(ecl=="d0"){dr=en.substr(en.length-1,1);dl=en.substr(en.length-2,1);d=(((Number(dr)-1)*9)+Number(dl))-1;n=c.substr(d,1);if(ev.length==0){e.value=n;}else{e.value="";}}}}}})();
Setup and use is the same as described above.
While it's not much fun to solve it like that (OK, maybe it's a little fun the first couple times), and definitely not challenging, if you are in a real-real-real hurry, you can solve it in 1 click.
Note: I have only tested these 2 bookmarklets with IE9.
I am using the highlighter module in Rangy.
I have a div element, which has some html. The html is actually loaded from a file using ajax, I have a button which does this loading.
Once the text is loaded, I can select a portion of the displayed html and press my "Highlight" button. This calls some Rangy code and highlights the text as desired...
//called on document load
rangy.init();
cssApplier = rangy.createCssClassApplier(highlightClassName, { normalize: true });
highlighter = rangy.createHighlighter(document, "TextRange");
highlighter.addClassApplier(cssApplier);
//called on "Highlight" button click
highlighter.highlightSelection(highlightClassName, selection);
For the purpose of replicating, please select a large portion for first highlight.
Next, I click my load html button to reload the html. The highlight is gone, as expected. But now I select another bit of text, which happens to overlap the first highlight that I did. Now when I press the "Highlight" button, for some reason the highlight is the one from the previous highlight. Why is this happening?
I know there must be something to do with the merging, but I can't understand why. When I debug the JS I can see that the selection (from rangy.getSelection()) is what I expect it to be.
Here is a JSFiddle replication of the problem
The reason this is happening is because each highlight exists as a pair of character offsets rather than having references to actual ranges in the DOM, meaning that when some part of the DOM is replaced, existing highlights remain blissfully unaware and continue to assume they are applied to the original character range.
Your workaround is fine. Another way would be to call the highlighter's removeHighlights() method:
highlighter.removeHighlights(highlighter.highlights);
Demo: http://jsfiddle.net/8pMEt/1/
I'm going to add a removeAllHighlights() method that will do the same thing.
One thing that the documentation doesn't make clear is that highlighting is designed to work on static DOMs, or at least DOMs with text content that doesn't change. Changing the DOM after highlights have been created could obviously throw character offsets off and the whole thing falls down.
I solved this problem by re-creating the highlighter prior to each highlightSelection call. I don't know why this works, but the highlighter must store some data regarding previous highlights that is uses for highlight merging or something.
The code in my question can be changed as follows to solve the problem:
//called on document load
rangy.init();
cssApplier = rangy.createCssClassApplier(highlightClassName, { normalize: true });
//called on "Highlight" button click
highlighter = rangy.createHighlighter(document, "TextRange");
highlighter.addClassApplier(cssApplier);
highlighter.highlightSelection(highlightClassName, selection);
I'm working on implementing sprited buttons in Stackoverflow's beloved WMD markdown editor and I've run into an odd bug. On all versions of IE, the selected text is lost upon button clicks, so, say, highlighting a block of text and clicking the code button acts like you placed the cursor at the end of the selection and clicked the button.
e.g. highlighting this:
This
Is
Code
and clicking the code button give you:
This
Is
Code`enter code here`
What's really weird is that I left the original non-sprited button bar in and that works just fine. In fact ALL buttons and keyboard shortcuts code use the same doClick(button) function!
Old-style non-sprited buttons: OK
Keyboard shortcuts: OK
Sprited buttons in non-IE browsers: OK
Sprited buttons in IE: WTF
I've isolated the problem down to a call to selection.createRange() which finds nothing only when the sprited button is clicked. I've tried screwing around with focus()ing and making sure as little as possible happens before the doClick() but no joy. The keyboard shortcuts seem to work because the focus is never lost from the input textarea. Can anyone think of a hack that will let me somehow collect the selected text in IE?
The onclick handler looks like this:
button.onmouseout = function(){
this.style.backgroundPosition = this.XShift + " " + normalYShift;
};
button.onclick = function() {
if (this.onmouseout) {
this.onmouseout();
}
doClick(this);
}
I've tried moving the onmouseout call to after the doClick in case that was causing a loss of focus but that's not the problem.
EDIT:
The only thing that seems to be different is that, in the original button code, you are clicking on an image. In the sprited code, you are clicking on a list item <li> with a background image set. Perhaps it's trying to select the non-existent text in my list item?
/EDIT
Actual code is located in my wmd repository on git in the button-cleanup branch.
If you revert to the 0d6d1b32bb42a6bd1d4ac4e409a19fdfe8f1ffcc commit you can see both button bars. The top one is sprited and exhibits the weird behavior. The bottom one contains the remnants of the original button bar and works fine. The suspect code is in the setInputAreaSelectionStartEnd() function in the TextareaState object.
One last thing I should mention is that, for the time being, I'm trying to keep the control in pure Javascript so I'd like to avoid fixing this with an external library like jQuery if that's possible.
Thanks for your help!
I know what the answer to my own question is.
The sprited buttons are implemented using an HTML list and CSS, where all the list items have a background image. The background image is moved around using CSS to show different buttons and states (like mouseover highlights). Standard CSS button spriting stuff.
This works fine in IE with one exception: IE tries to select the empty list text when you click on the background image "button". The selection in the input textarea goes away and the current selection (which will be returned by document.selection.createRange()) is moved to the empty text in the list item.
The fix for this is simple - I created a variable to cache the selection and a flag. In IE I cache the selection and set the flag in a mousedown event handler. In the text processing, I check for the presence of the flag - if it's set I use the cached range instead of querying document.selection.createRange().
Here are some code snippets:
wmd.ieCachedRange = null;
wmd.ieRetardedClick = false;
if(global.isIE) {
button.onmousedown = function() {
wmd.ieRetardedClick = true;
wmd.ieCachedRange = document.selection.createRange();
};
}
var range;
if(wmd.ieRetardedClick && wmd.ieCachedRange) {
range = wmd.ieCachedRange;
wmd.ieRetardedClick = false;
}
else {
range = doc.selection.createRange();
}
The solution is only a few lines of code and avoids messing around with the DOM and potentially creating layout engine issues.
Thanks for your help, Cristoph. I came up with the answer while thinking and googling about your answer.
You have to blur() a button before IE can select anything else on a page.
Can you provide a minimal example (only containing relevant code) which reproduces the bug?