Call Function Only If Another Function Does Not Return Error?
Feb 14, 2011
I'm trying to "progressively enhance" one of my surveys using javascript. Basically, I have rating scales that make use of radio buttons as each point on the scale. Each radio button occupies its own cell in a table. I wrote some functions that will highlight cells on mouseover in a color corresponding to its position on the scale (e.g. the lowest point is red, the midpoint is yellow, the highest point is green). When a radio button is clicked, the background of the button's cell and preceding cells in the same row will be colored accordingly. The functions are working well in FireFox and Chrome (I just have to add a few lines using the addEvent function to make it compatible with IE).
The effect looks a lot nicer when I add a function that makes the visibility of the radio buttons hidden.
However, I want to make sure that there is a fallback option in case the functions that color the cells don't work for whatever reason. I would not want the radio buttons hidden in this case.
Is there a method whereby I can call the "hideRadiobuttons" function only if the other functions are successfully executed?
I am having a problem of calling the user defined JS function after I make the AJAX call. Basically, I created couple radio buttons on the main html page. When the user clicks on one of the radio button, it will trigger the AJAX call and return another html file in the "div" content that I set in the main html page. The other html file contains a user defined JS function (e.g. "updateContent()") which use the onclick event handler to call the function. When I'm running the app, and click on the button. I had seen the firebug was complaining the "updateContent() is not defined" error. The function itself works fine and must be defined properly.
Here is the code in the main.html page:
Code:
<script type="text/javascript"> var asyncRequest; function getTools(url){ try
I am having a problem of calling the user defined JS function after I make the AJAX call. Basically, I created couple radio buttons on the main html page. When the user clicks on one of the radio button, it will trigger the AJAX call and return another html file in the "div" content that I set in the main html page. The other html file contains a user defined JS function (e.g. "updateContent()") which use the onclick event handler to call the function. When I'm running the app, and click on the button. I had seen the firebug was complaining the "updateContent() is not defined" error. The function itself works fine and must be defined properly. Here is the code in the main.html page:
Code: <script type="text/javascript"> var asyncRequest; function getTools(url){ try { asyncRequest = new XMLHttpRequest(); [Code]..script type=
I have a function which is called twice. It allows the elements of an array to be set to a different color, successively:
function ln8 (arrayA,color,current) { var arrayB=(typeof arrayA == 'string')? arrayA.split(',') : arrayA; var line = document.getElementById(arrayB[current]);
I know I shouldn't be having this problem at this stage. But what have I done wrong?I have my main page, I have my onload page and in that onload page I call a function:And then I get the error message:Fatal error: Call to undefined function OpenChat.Needless to say I am trying to create an instant chat.
I am really confused as similar code on Tizag web site works fine. Code: <script type="text/javascript"> function changeText(){ document.getElementById('boldStuff').innerHTML = 'Fred Flinstone'; }</script> <p>Welcome to the site <b id='boldStuff'>dude</b> </p> <input type='button' onclick='changeText()' value='Change Text'/>
<button onClick="return popup('<span onClick='selectShape(1, 1, 1)'>test<span>');" tabindex=Ɖ' onFocus="setFocusColor(0,3)">....</button> This will work perfectly, but as soon as I need to pass Strings inside the selectShape function, I get stuck.
So the question is, how can I create the following and have it working
i've got a function which makes a call to the database( via jquery $.post) to check if a username already exists. All the data I get back is fine and both the conditional statment works as intentded. I just can't get the function to return a value to the other function that calls it. Could this be something to do with the scope.
I'm wanting a table cell click event to remove and replace the table it was clicked on, however I'm finding that as it's deleting the original table object the actual running event code is being replaced and the function is bailing.how I can call the delete/refresh function from outside the event's function scope?
I have just started learning JQuery and have a doubt in the below code. $.get('myhtmlpage.html', myCallBack);The doubt is should the 1st parameter of the get function be a HTML file or can it be a unction name?
I want to call java function in javascript.In which we pass one parameter to function and its returns String value which I want to display in alert message.
I have a real perplexing issue. In two separate "projects" I had code that displayed checkboxes - when clicked, they would fetch information from a db and display it in the div below. I had code that displayed a jquery date-picker - when clicked, it would fetch information from a db and display it in the div below. My issue comes with this:
I have a document that can contain any number of iframes which have further copies of the same document (and so on). In practice, we shouldn't ever have frames within frames, but I'd like to make the implementation a general case.
Various of the functions in the parent document need to call themselves in the child documents with the same parameters as they've just been passed.
Now, I can stick a loop in each function that goes throught the window.frames array and calls the function for each frame, but for I'd like to write a function to do this.
It's at this point that my brain explodes. If I limit it to a single parameter we can do:
I'm in the middle of a JavaScript class, and I've run into a problem with one assignment. ^^; I've been given a pre-written script and HTML code to work with, and am required to modify it. Here's one thing I have to do, via my instructor:
Add an "email" field to this form. This field should also validate as a valid email address. (Hint: after adding the form field to the form itself, your next step will be to expand the function named submitIt() by adding a second if statement to confirm the contents of the email field. You will want to paste into the header and use the validEmail() function which you will find in Script 7.15, highlighted in red on pages 192-3 of your textbook.)
I know how to write the code to validate an email address, but I can't figure out how to call the validEmail() function in the submitIt() function. The code I have now just blanks out all the fields when I hit "submit." Here's the part of the script with the email validation:
window.onload = loadDoc; function loadDoc() { resetForm(document.forms[0]);
This is a very basic version of what I am trying to do. I have a dynamic list which is set in a table. When clicked, a function is run to set up a new list.. The reason I explain that, is that I need to keep it dynamic.Now for the problem:When I run this page, I have the button made right away, then when clicked it creates the new button. The new button should also run the function to create the new button again, but when I click it, I only receive "error on page".
I am creating a little word guess game, with a random function which picks the word from an array of 10 words. The second function checks if the users' letter choice is part of the secret word. Currently, each time the checkGuess() function is called, the word is changed, probably because I am calling the wordPicker() function from within. The wordPicker randomly chooses the word, then returns that word. All I want to do is pull that word into the checkGuess function, without calling the wordPicker function as it currently does. Here is the code:
Create secret word array var wordList = new Array("stealth", "telephone", "internet", "nickel", "marine", "instantiate", "method", "function", "television", "monitor")
I'm working through the sitepoint ajax book and had a problem with a particular chunk of code. I eventually tracked down the error and it was being caused because I had:
Now, one of the sticky threads mentioned that the first is a function call and the second is a function pointer. My questions are:What's the difference between a function call and a function pointer? Why did it cause problems in this particular case? What are the general implications/issues with using one over the other?
Is this correct? The following three lines are equivalent, for example, [1] can be replaced with [2] or [3] anywhere in a script without changing the return value and without changing any side effect.
[1] var r = o.f(a,b); [2] var r = o.f.call(o,a,b); [3] var r = o.f.apply(o,[a,b]);
( o is an object and o.f is a function. )
The following three lines are equivalent: [1'] var r = g(a,b); [2'] var r = g.call(this,a,b); [3'] var r = g.apply(this,[a,b]);
( g is a function, for example, var g = function(a,b){return [this,a,b];}. )
is there a way in jQuery to bind variables to function calls similar as prototype.js does it? See [URL]
E.g. in the slideUp method of jQuery you can specify a callback that is called after the effect has finished. I would like to bind a variable to this call so that it is used inside of this callback as a closure.
I'm trying to pass titleArray and pointsArray to the task(); I'm getting an error mgs this.assignments() is not a function. I've highlighted this.assignments()
Afternoon all, Have a pretty simple function, that requests a number to be entered. I want to return that number, but i seem to be typing something wrong in the return value.
function newFunction(a, b) { var newArray = new Array(a); for (var i = 0; i < 5; i = i + 1)
I am populating a field on my page using a php include. I am asking javascript to update another element with that field's value. The value written to the select input box is Ƈ:Any Provider'. The process works fine in Firefox. In IE6 it does not write. the value nor does it throw an error. What am I doing wrong?
function postthis(){ var provider = document.inputForm['provider'].value; var report = document.getElementById("status"); var message="The Value of Provider Block is: " + provider; report.innerHTML = message; }
In firefox, "The Value of Provider Block is: 1:Any Provider" is written in the report element. In IE6, "The Value of Provider Block is : " is written in the report element.
I know the answer must be yes, but I am really having a hard time figuring this out. I have a simple script below, that calculates age (I know I need to do some more work). I want to redisplay the value returned from the function. It works OK, because the result displays correctly in the alert. Code:
I have a form and a submit button .on clicking submit button function validate call.this function call another function (say func) .this func function vallidates some input and return true or false value to the validate function this then return true or false value to the submit button .I want that func directly return true or false to the submit button.
