Hello World - Display A Alert And For Some Reason The Browser Is Just Displaying The Code

Feb 26, 2010

Just trying to display a javascript alert and for some reason the browser is just displaying the code

I have put the following into a file called test.js but it is just displaying all thie code in the browser - see [url]

I am sure this is something really basic. I have tried this in Firefox and IE

Code:

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I hope this is relatively simple. I've looked around for the answer, but I thin think the search terms (update onchange event) are a bit too common...

document.getElementById("tester").innerHTML= "hello";
document.getElementById("tester").onmouseover = "alert('hello')";

You see I'm trying to change an event like I'd change a property. The first will change the text to hello. I'd like the second to change the onmouseover event to display a hello world alert... but it doesn't seem to do anything.

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I have a bit of coding that is keeping me up at nights because of it's damn stubborness. All I want to do is pop-up an Alert that says Hello World.

I'm new to coding period so I'm writing verbatim dummies javascript book examples.

Here is the code for the script:

Okay I've done this code , and variations and only have ended up with the same message in firefox "syntax error""quirks mode".In IE 8 I get messages to cryptic to understand.

So what gives? Where is my error in syntax?The code makes sense to me, and I'm following XHTML conventions.:

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Displaying Upper ASCII (code 128-255) In Alert() Window.

Jul 23, 2005

Most of these characters are not on the standard keyboard.
Here's a successful contrivance, with comments & cautions,
a little page that works in IE6.

<HTML><HEAD><SCRIPT TYPE="text/javascript">
function alt() {
document.all.s1.innerHTML="Current Temp: 68F";
var txt=document.all.s1.innerText;
alert(txt);
}
</SCRIPT></HEAD>
<BODY>
<INPUT TYPE="button" VALUE="Temperature" onClick="alt()">
<P ID="s1" STYLE="visibility:hidden"> </P>
</BODY></HTML>

comments: The innerHTML property is needed to produce the
character glyph from the entity code. If the entity string
were passed to innerText(in 1st statement) then the code
would remain literal.

This work-around depends on s1 being rendered before alt()
is called. It will not work as immediately executed code,
because element s1 would not exist yet.

cautions: Trying to style alert's display will produce error
msgs. Do not use <B>, <U>, or <I> tags in the argument
string. No Heading tags either.

Strange enough, an inline STYLE, setting font values, say,
does not give error msg, but will not execute either.
Alert ignores it.

You can use <BR> tags in the argument, which give the same
result as
in a direct arg to alert().

In sum, you can tell alert what characters to display,
in what order, and on what line, but you cannot tell
alert HOW to display them.

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<!DOCTYPE html PUBLIC

This is my test page.

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This (code) implementation just shows the text in strong tag and the image. There is no messagebox displaying the alt message. Please tell me where I'm wrong. I've already downloaded the jQuery library and it lies in the same folder as this code.

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I'm trying to run through the simplest tutorials on jquery and for some reason I can't get any of the jquery code to work.I've downloaded jquery and I've made sure that this file is in the same directory as jquery-1.3.2.js.This is the code taken from the tutorial:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">[code]....

when the user clicks on the link it shouldn't take them to [url]....instead it should display an alert box. but it takes me to[url]...every time.

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I am in the process of learning javascript and I've been looking at this code for the longest time ever. So far I got most of it done. For example I leave all the required fields empty, it gives me the alert message of the first field and not the alert messages of all the others. What I want to know is how can you go through and check the whole form first before submitting and then when there is any error on any field, shows just one alert message containing all the error messages.

Code for the form
<form action="mailto:hummdedum@felloff.com" method="post" name="form" onSubmit="return isFormValid();">
* First Name: <input type="text" name="FName" id="FName" onblur="checkFName();"/><label id="labelFName"></label><br />
* Last Name: <input type="text" name="LName" id="LName"onblur="checkLName();"/><label id="labelLName"></label><br />

* Password: <input type="password" id="pw" name="Password" onblur="checkpw();" id="pw"/><label id="labelpw"></label><br />
*Re-type Password: <input type="password" name="2Password" id="pw2" onblur="checkpw2();" /><label id="labelpw2"></label><br />

I am a: <br />
<input type="radio" name="status" value="fresh" /> Freshman<br />
<input type="radio" name="status" value="soph" /> Sophomore<br />
<input type="radio" name="status" value="jr" /> Junior<br />
<input type="radio" name="status" value="sr" /> Senior<br />

I am taking classes in the: <br />
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<input type="checkbox" name="semester" value="spring" /> Spring time <br />

My favorite element is:
<select name="element" id="element">
<option value="">select one</option>
<option value="fire">Fire</option>
<option value="earth">Earth</option>
<option value="water">Water</option>
<option value="air">Air</option>
</select><br />

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*E-Mail: <input type="text" id="email" name="Email" onblur="checkEmail();"/><label id="labelEmail"></label><br />
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I works fine if I place an alert() statement after the HTML is created, but when I remove, the code errors out.

I have tried the setTimeout() statement, but I cannot grab the element --- undefined or null is returned. It seems that the form is the only element I can get a handle on --- everything else is undefined or null...

Here is the code:

function editQuery() {
var f;
var x;
var myForm = document.forms[0];
// Get the row filters that were used in the last query..
for (f = 1; f < 16; f++) {
var filter = eval("myForm.FilterList_" + f);
if (filter.selectedIndex > 0) {
var methodElement = element("FilterMethod_" + f);
var methodIndex = methodElement.selectedIndex;
var savedFilterMethodValue = methodElement.options[methodIndex].text;
var choicesElement = element("FilterChoices_" + f);
var choicesIndex = choicesElement.selectedIndex;
if (isNaN(choicesIndex)) {
var savedFitlerValues = choicesElement.value;
}
else {
var savedFitlerValues = choicesElement.options[choicesIndex].text;
}
updateFilters(filter); // update the filters
// take the saved methods and values and then update the selections
// Alert here makes the code work..
// alert("Try this");
// Wait for HTML..
setTimeout("completeEdit()", 1000);
function completeEdit() {
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var methodElement = element("FilterMethod_" + f);
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if (methodElement.options[x].text == savedFilterMethodValue) {
methodElement.options[x].selected = true;
break;
}
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}
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var choicesElement = element("FilterChoices_" + f);
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choicesElement.options[x].selected = true;
break;
}
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choicesElement.options[x].selected = false;
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}
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displayNextFilter(f - 1); // display it
}
}
clearTimeout(timeOut);
}
}
}

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