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JavaScript - Help With Replace Characters From A String
Can some one help me, I want to replace the characters from a string and I have tried with this script:
Code: var v5=form.description.value.replace(/#/, "%23"); But it only changes the first character from the string. Turning #### into %23### but I want them all transformed. Similar TutorialsThis is driving me nuts I need to replace all instances of "zz" with 'Z'. I can easily replace other strings such as a = a.replace(/mickeymouse/, "Z"); but a = a.replace(/zz/, "Z"); doesn't work. Must be a double characer thing? Hi, How can I strip out the dirty characters shown in textarea after to extract the tags from a webpage and before submitting to another page? By dirty characters I take in mind the characters shown in the image below. - Replacing double space with a unique space - Replacing "squares" with a blank space - delete contents between "<!--" and "-->" or "<?" and "?>" Jan Lee Hello I have this snippet for controlling the number of characters entered in a textarea. It works. But, if I replace in this code the name "my_form" by "contact-form" and "my_text" by "message", it doesnt ! It looks like the keyword is " my_form ". You change that , and the script will not work! It turns out that I have to change those names because the form as it was already had those names my_form and message before I added this counter And I dont want to replace the names of the form in order to adapt them to this code snippet below. The question is why would the script not work if I have just replaced two words, which dont seem to be keywords of JS programming (my_form and my_text) <html><head> <title>(Type a title for your page here)</title> <script language=JavaScript> <!-- function check_length(my_form) { maxLen = 50; // max number of characters allowed if (my_form.my_text.value.length >= maxLen) { // Alert message if maximum limit is reached. // If required Alert can be removed. var msg = "You have reached your maximum limit of characters allowed"; alert(msg); // Reached the Maximum length so trim the textarea my_form.my_text.value = my_form.my_text.value.substring(0, maxLen); } else{ // Maximum length not reached so update the value of my_text counter my_form.text_num.value = maxLen - my_form.my_text.value.length;} } //--> </script> </head> <body> <form name=my_form method=post> <textarea onKeyPress=check_length(this.form); onKeyDown=check_length(this.form); name=my_text rows=4 cols=30></textarea> <br> <input size=1 value=50 name=text_num> Characters Left </form> </body> </html> i am trying to make an online graphing calculator with javascript. dont ask how because i dont know. but there is an annoying error in a do...while loop. although it should break out of the loop when the |'s (absolute value signs) are replaced with Math.abs( and ). here is the code. Code: var initec = function(){
var rg = {
}
;
rg.matc = false;
rg.i = 0;
rg.change = function(equ){
if (typeof(equ) != "string"){
alert('Equation must be a string');
return;
}
alert("starting equation: "+ equ);
rg.i = 0;
do{
rg.matc = equ.match(/\|/);
if(rg.i === 0){
equ.replace(/\|/, " Math.abs(");
rg.i = 1;
alert("1 "+equ);
}
else {
equ.replace(/\|/, " ) ");
rg.i = 0;
alert("0 "+equ);
}
}while(rg.matc)
alert("finished equation: " + equ);
}
return rg;
}
rg=initec();
rg.change("|8/x+7|-2");
the last 2 lines and the alerts are for debugging. as you can see, it is not finished. but still, it should work. How can to obtain length of string variable, for example if I have: var msg = 'hello world!'; Does it exist a method to count string characters? Hi, So I've got an array called questions_raw Code: questions raw = [
["<Q1> Question",
"choice1","choice2", "choice3"],
["<Q2> Question",
"choice1","choice2", "choice3"],
...
]
And I want to list all of the questions, but not the choices/answers. So far, I've managed to list just the questions, but because another function randomly sorts them, I need to sort them back into numerical order for a separate function (displaying the questions) I use characters (>,^) at the front to separate them into different answer types (just to explain the code) I try this to cut each string down so that they can be sorted numerically/alphebetically - Code: function linearlist()
{
var list = [];
var tempStr = "";
for (var l = 0; l < 145; l++)
{
tempStr = questions_raw[l][0];
list[l] = tempStr;
}
if (list.charAt(0)== " " ) list = list.substring(3) ;
if (list.charAt(0)== ">" ) list = list.substring(3) ;
if (list.charAt(0)== "^" ) list = list.substring(3) ;
var sorted = list.sort();
document.Qtext2form.Qtext2.value = sorted.join("\n");
}
But it doesn't like it - because "it has no method charAt" Any idea what i'm missing? Is it just that you have to put the [l] in every time you call a variable? Cheers I would like to replace all the characters within a string with asterisk using javascript. Ex: If i have a string "test123". Replaced string should be "*******". Could you please let me know how i can implement this using Regex within javascript. hello, I'm trying to build a simple function to append and replace an argument in a query string, for example, if my url was like; www.domain.com/page.php?test=123&blah=abc and I want to add on qty=5 like; www.domain.com/page.php?test=123&blah=abc&qty=5 ok, no problem there, however if I now want to update that to qty=6, i get this: http://www.domain.com/page.php?test=...bc&qty=5&qty=6 my code thus far; Code: function AppendURL(){
var AURL = document.getElementById('AddToCartLink');
var numQty = document.getElementById('Qty').value;
var TempURL = AURL.href;
AURL.href = TempURL + '&Qty=' + numQty;
}
Hi, I'm just wandering, how can you stop the replace() function from replacing characters inside a word, such as, if I try to replace 'x' with 'and', then my string would go from 'example, x' to 'eandample, and'. Thanks in advanced Hi, I'm fairly new to javascript as well as brand new to these forums. I have a question that I'm sure has a simple answer but I either can't get my head around it or I'm just too unfamiliar with string methods. I'm trying to replace all instances of "&" with its alt code "&" in a string. Below is my code.. Code: Match = subText.indexOf("&");
while (Match != -1)
{
subText = subText.replace( "&", "&" )
Match = subText.indexOf("&");
}
The problem here is that an ampersand will always exist in the string if there was one originally and I get an infinite loop. Would anyone know of a way around this? Thank you. Here is the code i am trying. Code: var str="اسدف";
patt=/[\u0600-\u06FF\u0750-\u077F]/;
result=patt.test(str);
document.write("<br />Returned value: " + result);
</script>
This should return true, as the string in the str variable is indeed Arabic character. But it returns false. Need some help here on this.. Thanks in Advance I have a problem thats above my head, im new to javascript. I want to be able to control the first three characters of an input string on a login form. If a user types GP15555 or JP15555 I want it to change to GPL5555 or JPL5555 respectively changing the "1" to an "L" on the prefix is this at all possible? any point in the right direction would be great. heres my code Code: </script>
<script language="JavaScript" type="text/javascript">
//<![CDATA[
function Login(form) {
var password = form.password.value;
var pin = form.pin.value;
var product = form.product.value;
if (password) {
var htsite = product + "/" + password + "/" + pin + "/index.html";
window.location = htsite;
}
else {
alert("Please enter your password and pin.");
}
}
// End -->
//]]>
</script>
/thanks gp I need to declare a variable (astString) and initialise it with a string of asterisks. astString needs to be the same length as another variable (otherString). otherString changes it value regularly so I think I need to use the .length property in some way but I can't see how! This should be simple but it's eluding me completely. Hi, I am trying to write some code that will test if a user enters a non-numeric character in an input text field, and if so, replaces it with a '0' Code:
<script type="text/javascript">
function IsNumVal (){
for (J=1; J<=3; J++){
if (isNaN(Number(document.getElementById('Intext' + J).value))){
document.getElementById('Intext' + J).value = 0;
}
}
}
</script>
<Body>
<table border="1" cellspacing="1" id = "Numbers">
<tr id="RowNum1">
<td ><input type="text" size = "5" name="Intext1" id="Intext1" value = "3"
onkeyup="IsNumVal()" /></td>
</tr>
<tr id="RowNum2">
<td><input type="text" size = "5" name="Intext2" id="Intext2" value = "9"
onkeyup="IsNumVal()" /></td>
</tr>
<tr id="RowNum3">
<td><input type="text" size = "5" name="Intext3" id="Intext3" value = "18"
onkeyup="IsNumVal()" /></td>
</tr>
</table>
</Body>
document.getElementById('Intext' + J).value = 0; doesn't work document.Schedule.'Intext' + J.value = 0; doesn't work document.Schedule.Intext2.value = 0; works, but I need to test each text field while looping, so I can't "hard code" the ID. Suggestions? How do I replace the string "rpg" only present in between <et> tags ? Code: <et>ReplaceOnlyrpg</et> After replacement it should look like this Code: <et>ReplaceOnly</et> Any advice is appreciated. Thank you I have been using code such as Code: a=a.replace(/ /g,''); b=b.replace(/;,/g,';'); to eliminate spaces in a string, as well as converting things like ";," to ";" in strings. Several instances of these replacements will have to occur in the strings. Unfortunately, I cannot make it work for converting two commas into one or for eliminating line breaks. Does anyone know how to do this (preferably without using "while")? Hey all, I have a simple example below showing how when I pass in the value of the value attribute of option node, and then use if operator to check whether parameter is a string or not, even though it's a string, it converts it to false boolean and triggers the else statement rather than calling a function: Code: <body> <select> <option value="createMsg">Add Message</option> <option value="removeMsg">Remove Message</option> </select> </body> Code: var menu = {
handleMenu : function(callback){
if(callback === "string"){
menu[callback]();
}
else {
console.log("Issue occurred")
}
},
createMsg : function(){
var content = document.createTextNode("Please give additional information."),
heading = document.createElement("h1");
heading.appendChild(content);
document.body.appendChild(heading);
},
removeMsg : function(){
}
}
document.getElementsByTagName('select')[0].onchange = function(){ menu.handleMenu(this.value)};
callback should be a string so why is it saying otherwise? Thanks for response |
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