vbscript - displaying a message box when an OnClick event fires - javascript

I feel a bit silly asking this question, since most of the questions people ask on here are way beyond my level as a programmer, but at least I know I'm in good hands as far as asking goes. I used to know how to make simple vbscript and javascript programs, but I'm a bit rusty. I'm trying to refresh myself, and despite repeated google/other searches, can't recall how to make it so that when a button is clicked, a msgbox appears. Also, I'd like to know how to modify the .value attribute of a textbox. I'm attempting this in vbscript for now, but I'll try javascript if anyone knows a way to do it in that instead. My ultimate goal is a text based type game where you can click buttons labeled, "north,south,west,east", and make it like an rpg. The textbox would display the current room description.
Here's the code I have so far, which isn't displaying the msgbox.
<html>
<title>Explor-o-Rama!</title>
<body>
<form name = frmMain>
<textarea name = "txtDisp" rows = "10" cols = "50"></textarea><br>
<input type = "button" name = cmdTest value = "test">
</form>
<script language = "vbscript">
sub cmdTest_OnClick
msgbox "test"
end sub
<script>
</body>
</html>

You have:
msgbox "test"
The correct command is:
MsgBox("test")
OR
X=MsgBox("test")
This SHOULD DO IT.

also, <html><body><script language=vbscript>msgbox "" </script></body></html> not works.
but this code works OK:
<html><body><script>alert('Test');</script></body></html>
<html>
<body>
<script>
function test()
{
alert('Test');
}
</script>
<input type = 'button'; onclick='test()'>
</body>
</html>
Probably, it's a IE internal bug.

Related

click a button on a web site automatically with javascript

I modify a code like that, for click a checkbox.
Such as,
Is there a any problem about button name or id. I could see just name and class. Is this a problem for work?
<html>
<head>
</head>
<body>
<button>Giris</button>
</body>
<script type="text/javascript">
var chkA5 = "button" class=formCheckBox type=checkbox value=ON name=chkA5
window.onload = function() {
document.getElementById("chkA5").checked = true
});
}
</script>
</html>
I copied all chechbox button properties on web site (F12 + Slect Element + click to check box) and pasted in my script. But I really confused, when I write a code in script, describing works for new things which I add or create. On this web site which I want to click a chechbox on has already buttons and text/check box. How can I create a connect with each other my scrips and web site.
In brief; I couldn't connect my scripts to web site's button and because of that I couldn't do any operation. Am I right?
How can I solve this problem? On picture which I shared, there are some code marked in a red square. This code works for desciribe some element in my scribs?
When we use document.get.ElementById().checked =true, on web site's element properties's has not a id? It has name and class.
Problem 1: getElementById should be getElementByName
Based on your screenshot, the input item you are trying to reference is:
<input name="chkA5" class="formCheckBox" type="checkbox" value="ON"></input>
and you are trying to getElementById()
document.getElementById("chkA5").checked = true
However, there is no id declared, so you will have to get the item by the name, using getElementByName():
document.getElementsByName("chkA5")[0].checked = true;
Problem 2: Your javascript has errors
This line will cause your script block fail:
var chkA5 = "button" class=formCheckBox type=checkbox value=ON name=chkA5
If you require a complete code sample, here is an example:
<html>
<head>
</head>
<body>
<input name="chkA5" class="formCheckBox" type="checkbox" value="ON"></input>
</body>
<script>
(function() {
document.getElementsByName("chkA5")[0].checked = true;
})();
</script>
</html>
Note: Make sure that the script block is at the end of your html, like in your example code provided.

What is wrong with this basic Javascript code? [closed]

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I'm watching a basic tutorial series on javascript and have been stuck on this super simple script for like close to 30 minutes now. I used an html validator and it all checks out with no errors. However, the code is still not behaving how it should according to the video.
When you type "click me" its supposed to show a dialog box saying 'please enter a real value into the box'. And when you enter a value in the field, it's supposed to substitute the title for whatever you entered.
Sorry for the simple nooby question
EDIT AGAIN: Thanks Arby. That got it working.
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Example</title>
<script type="text/javscript">
function substitute () {
var myValue = document.getElementById(myTextBox).value;
if (myValue.length == 0){
alert('Please enter a real value in the text box!');
return;
}
var myTitle = document.getElementById('title');
MyTitle.innerHTML = myValue;
}
</script>
</head>
<body>
<h1 id="title">JavaScript Example</h1>
<input type="text" id="myTextBox" />
<input type="submit" value="Click Me" onclick="substitute()" />
</body>
</html>
I found some issues with your code, just simple stuff that every beginner goes through (I did), I'll bullet them off:
MyTitle isn't myTitle, JavaScript variables are case-sensetive.
You should stay away from the onclick attribute; he's a bad influence. The point, inline JS is generally not a good idea.
So I added an event listener event instead: [...].addEventListener("click", callback);
Your DOM request to the input box used an undefined variable/object/etc. called myTextBox, instead of a string "myTextBox".
Anyway, I made a JSFiddle for the code, so I could test it, so here is the link to the code with the edits I explained above: https://jsfiddle.net/Lktzw0Lh/
A slightly different approach - since you list jQuery in the tags for this - i have rejigged the code to take advantage of it. I put an onclick event handler on the button which, when clicked gets the value of the textbox and if it is empty - gives the alert. If it is not empty - it swaps the h1 text for the entered text and clears the text input and gives it focus so that you can re-enter new content.
Note that the click handler is in the javascript section and not inline js and also that with jquery - you can chain together commands that affect the same element.
$(document).ready(function(){
$('#testButton').click(function(){
var myValue = $('#myTextBox').val();
if (myValue == ''){
alert('Please enter a real value in the text box!');$('#myTextBox').focus()
}else{
$('#title').text(myValue);$('#myTextBox').val('').focus()
}
})
})
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Example</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<h1 id="title">JavaScript Example</h1>
<input type="text" id="myTextBox" />
<button id="testButton" type="button">Click Me</button>
</body>
</html>

javascript split text into list of words and then dynamically added to div, form tag messing it up

I was testing this code out in an asp.net webform as I am looking to split a text into a list or words in javascript and have each added to its own div.
http://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_split
However in an asp.net webform, the sample code alone produces strange behavior, and the result appears and disappears. Simply adding the form tags to the online sample reproduces the behavior.
<form id="form1" runat="server">
</form>
Is there a workaround for this or alternative ideas to do this in javascript?
Thanks
The behavior you are experiencing is happening because the button is triggering a postback to the server. This essentially reloads the page which is why it appears as though the text is appearing then disappearing right away.
You can fix this by adding in a return false; after onclick="myfunction()" like this:
<form id="form1" runat="server">
<p>Click the button to display the array values after the split.</p>
<button onclick="myFunction();return false;">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var str = "How are you doing today?";
var res = str.split(" ");
document.getElementById("demo").innerHTML = res;
}
</script>
</form>
However, I do not recommend using the onclick attribute to call a JavaScript function as there are better ways to do this. For the purpose of your example, I provided the simplest solution to the problem, but I want to make you aware that there are better ways to handle this.
As an extension to Howard Renollet's explanation for the form behavior:
A <button> element has different types. W3Schools mentions that "different browsers may use different default types for the element."
When in a form, the submit and reset types will actually do things to the form! In order to put a button into a form without it submitting the form, set the type to button:
<form>
<button type="button">Yay, I won't submit this form!</button>
</form>

How to find active tag formats using jQuery?

I have a situation with sample code as follows:
<html>
<head>
<title>Untitled Document</title>
</head>
<body>
<p>
<h1>The header</h1>
<div>
matter ia always matter matter ia <strong>bold matter</strong> matter matter <em>italics matter</em>matter ia <em><strong>bold italics matter</strong></em>lways matter
</div>
</p>
</body>
</html>
I am just trying to retrieve the specific tags like body->p->div->em->strong when I click on "bold italics matter" using jQuery. Is there any standard method to retrieve as per the click event?
If you wan to get the tag name of the element which is clicked, then you can use:
$('*').click(function(e) {
e.stopPropagation();
console.log($(this).prop('tagName'));
});
Fiddle Demo
I'm not completely sure about what you are trying to accomplish. If you are trying to retrieve the tag itself that the text is contained in, i would recommend that you put a <span> tag in around the the text in question and do an onclick="function()" or simply put the onclick right on the <strong> tag.
As far the the JQuery/Javascript goes, if you want to retrieve the content, it looks like
var foo = document.getElementById.innerHTMl("id");
However, this requires you to have an id in your tags which is probably the best, if not
'standard' method of retrieving the content that is within the tag.
After reading your comments, i am editing this post:
The best way to get the parent elements is to use the JQUery .parent() function. I'd imagine that you would just recursively state something like this:
var foo = $("nameofelement").parent();
I hope this is more of what your looking for.
Thanks for contributing everybody. At last I made it myself with the following code.
$(document.body).click(function(e){
var Tags=[], Target=e.target, stat_msg="";
Tags.push(Target.tagName);
while($(Target).parent().get(0).tagName!=="BODY")
{
Tags.push($(Target).parent().get(0).tagName);
Target=$(Target).parent();
}
Tags.push("BODY");
for(i=Tags.length;i>0;i--)
stat_msg=stat_msg+Tags[i-1]+" ";
alert(stat_msg);
});

use eval to evaluate a javascript snippet in a textarea?

I'm at my first hackathon and trying to finish my project. I am very very new the javascript... everything I know I literally learned in the last 2 hours. That being said...
So I know that eval is not the greatest thing to use, but I'm trying to write a simple program in which you can input a javascript snippet into a textarea, click an execute button, and have the javascript execute inside another textarea. I'm trying to stay away from jquery for now, because I want to get the really basic idea down before I add another level of complexity, which is why I'm not using id's.... but if jquery is the only way to do this, then I guess I'll have to pony up and learn it in the next 8 hours.
Code as follows (ish):
function executeJS ()
{
var result = eval(game.input.value);
game.execute.value=result;
}
<head>
<body>
<H1>PRogram</H1>
<form name="game">
<textarea name="execute" rows="5" cols="30" value=""></textarea><br>
<textarea type="text" name="input" rows="10" cols="30" value=""></textarea>
<input type = "button" value = "guess" onclick = "executeJS()</input>
</form>
</body>
</head>
I'm not getting an output in my execute box.
Any insight would be much appreciated.
"game" isn't a variable. it's a DOM element name.
if you want to get it's object, give it an id let's say "game", and use document.getElementById('game')
Note that your <head> surround the <body>
Your javascript code isn't inside <script></script tag.
Here is a working version. However, I would reconsider your idea of not using IDs or libraries:
function executeJS() {
var game = document.forms['game'];
var result = eval(game.input.value);
game.execute.value = result;
}
And be wary of eval.

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