Using javascript prompt I get two parameters like, search string and search keyword, then search for the keyword and get the number of items found. Then need to show them on the page. Seems to mistake I have made.
<html>
<head>
<script type = "text/javascript">
var counter = 0;
var enter = prompt("Enter your String:");
var search = prompt("Enter words to search:");
var b = search.length;
var a = enter.length - search.length;
for (var y = 0; y <= a; y++)
{
if(b <= enter.length){
if(enter.substring(y,B))
{
counter = counter + 1;
}
b++;
}
else{
document.write("<p>" + "ERROR" + "</p>");
}
document.write("<p>" + "your word:" + enter + "</p>");
document.write("<p>" + "word use:" + counter + "</p>");
</script>
<body>
</body>
</head>
</html>
You are using a variable that is not declared. Remember that Javascript is case sensitive and the variable b is different than B.
You forget to close the for brackets.
You need to compare the substring with the search pattern.
As Sameera Thilakasiri has rightly pointed out, your code is sloppy. If that works for you, great (I suppose), but other people who look at your code may have a hard time following it. Further, sloppy code leads to mistakes that would otherwise be easily caught.
For instance, you have not closed the for loop, which would easily be seen in nicely formatted code.
Beyond the open for loop, the only other problem I see (syntactically) is that JavaScript is a case-sensitive language, which means that b is different from B, which is why your script throws the 'Uncaught ReferenceError: B is not defined' on the line if (enter.substring(y,B)) {.
Try closing your for loop and using a lowercase b on the offending line. Once that is done, you only have to fix the logic errors.
Happy coding.
You can also use indexOf:
var counter = 0;
var enter = prompt("Enter your String:");
var search = prompt("Enter words to search:");
var start = 0;
while(1){
start = enter.indexOf(search,start);
if(start==-1) break;//if nothing found
start++;//next start = current occurrence + 1
counter++;
}
document.write("<p>" + "your word:" + enter + "</p>");
document.write("<p>" + "word use:" + counter + "</p>");
Related
I'm trying to make a website that gathers information from APIs. The following code always evaluates to 'Beep Boop Beep! I can\t find the Wikipedia page with the API! :-( \n Anyways here is more info on...'! Anyone have any ideas why?
var geoNamesWiki = result.geoNamesWiki;
for (let j = 0; j < 30; j++) {
if (geoNamesWiki.geonames[j].feature == 'country' &&
(geoNamesWiki.geonames[j].countryCode == openCage.results[0].components["ISO_3166-1_alpha-2"] ||
geoNamesWiki.geonames[j].title.includes(openCage.results[0].components.country))) {
$('#summary').html(geoNamesWiki.geonames[j].summary);
$('#wikiLink').html(geoNamesWiki.geonames[j].wikipediaUrl).attr("href", "https://" + geoNamesWiki.geonames[j].wikipediaUrl);
} else {
$('#summary').html('Beep Boop Beep! I can\t find the wikipedia page with the API! :-( \n Anyways here is more info on' + openCage.results[0].components.country + ':');
$('#wikiLink').html('https://en.wikipedia.org/wiki/' + encodeURI(openCage.results[0].components.country)).attr("href", 'https://en.wikipedia.org/wiki/' + encodeURI(openCage.results[0].components.country));
}
}
Is suspect you have a string there at var geoNamesWiki = result.geoNamesWiki;
Try parsing it to a JSON object first var geoNamesWiki = JSON.parse( result.geoNamesWiki );
I found the answer thanks to #Bekim Bacaj! I was overwriting what I had already done, so just needed to add a break on the final line of the IF part.
I have column in my database named rate but the datatype is string and has values like '2000+'. When I try to show this value using jQuery, why is it only showing 2000 without the '+' sign?
for (var j = 0; j < dtt2.length; j++) { if (dt0[i].CategoryID === dtt2[j].CategoryID) { var rate = dtt2[j].Rate; alert(rate.tostring()); $("#" + tbl).append('<tr><td>' + dtt2[j].ServiceName + '</td><td width="20%">₹ ' + rate.tostring() + '</td></tr>'); } }
this code is working when running on local host but when i am hosting on production the error comes string without + sign
Below is the code behind code-
foreach (DataRow dr in dt2.Rows)
{
ServiceRateList sd = new ServiceRateList();
sd.ServiceDetailID = Convert.ToInt32(dr["ServiceDetailID"]);
sd.ServiceName = dr["ServiceName"].ToString();
sd.CategoryID = Convert.ToInt32(dr["CategoryID"].ToString());
sd.CategoryName = dr["CategoryName"].ToString();
sd.Rate = dr["rate"].ToString();
bislist.Add(sd);
}
Note sure how you displaing plus sign in your JS codes.
But here work-around is to escape the plus sign by preceding it with a backslash.
var data = dbrawdata.replace('+', '\\+');
It would be good to answer your question add some line of your codes.
As i understood
Very simple,
var value='2000+';
value.toString(); // => '2000+'
OR
String('2000+'); // '2000+'
for(var i = 0; i < textList.length; i++){
for(var j = 0; j < titles.length; j++){
if(textList[i] === titles[j]){
console.log ("it includes my " + titles[j] + ' the match is ' +textList[i] + " counter " + i)
}
}
}
this is my code, but it won't return a match. I tried == and ===. But when i tested .includes() it worked. Can someone explain what's happening ?
If you are sure that all elements are in type String, you can use the method .search():
Prototype search
It will return the position of the match, if it dosent match in any position you will get -1 as return, soo > 0 it match.
I just tested your code with a very basic test example as follows:
let textList = ['book1', 'book2','book3']
let titles = ['book', ' tester', 'not_this', 'book2']
for(var i=0; i<textList.length;i++){
for(var j=0; j<titles.length;j++){
if (textList[i] === titles[j]){
console.log ("it includes my " + titles[j] + ' the match is ' +textList[i] + " counter " + i)
}
}
}
And I got the expected result it includes my book2 the match is book2 counter 1 so with this specific code I would suggest looking at you input arrays.
With regards to your question regarding why .includes() works and this doesn't, again we would need to se your input arrays but I would hazard a guess that it is something to do with the type checking within this function.
Finally, as others have suggested, there are other (more succinct) ways of achieving this with built in array functions, however your original question was about why this code in particular doesn't work so I've left these out.
First off my apologies if I did something incorrectly with asking a question, I'm very new to stackoverflow and javascript as well. I am having an issue with passing a property through my getPassword function and I've searched around and couldn't truly pinpoint an answer. The code I created is designed for an object called "student" with two properties; FirstName and LastName.
Using a couple of dialogue boxes the information related to each student is entered. At the end, a prompt should display and asks the user "Do you want to add more student?" If the answer is "Yes", It asks the next student's information. If the answer is anything else, It stops asking. Then the information is displayed on the webpage. I want to have a property called "UID" The format of UID is FirstName_PSWD. For calculating the "PSWD" the function called "generatePassword" is used. This function randomly creates a 6-digit password including characters and numbers. For example: if username is John, then UID may be "John_X12bn231". I can not seem to get this password function to work, what might I be doing wrong? I am also aware that there might be other errors in my code, which I do apologize for i am very much a beginner.
var student={FirstName:"", LastName:""};
var studentlist=[];
var i=0;
function generatePassword() {
var length = 4,
charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
retVal = "";
for (var i = 0, n = charset.length; i < length; ++i) {
retVal += charset.charAt(Math.floor(Math.random() * n));
}
return retVal;
}
function Register() {
var next="Yes";
while (next="Yes"){
student.FirstName=prompt("Please enter the name");
student.LastName=prompt("Please enter the last name");
studentlist.push(student);
document.getElementById("demo").innerHTML += "<li> <b>First Name:</b> "+ studentlist[i].FirstName + "," +
"<b>Last Name: </b>"+ studentlist[i].LastName + "," + "</li>";
next = prompt ("Do you want to add more data?", "Yes")
i++;
}
}
Two mistakes:
var student={FirstName:""; LastName:""};
Should be -> var student={FirstName:"", LastName:""};
var i==0; -> var i = 0;
Try after changes and tell me if it works ;d
Btw. Javascript is a frontend. Your users will be able to check how you generate the password, because all your code can be read.
So essentially what I'm trying to do is to figure out how to repeat a line x number of times based on a prompt's output.
i.e
<script>
var favnumber = Number(prompt("What is your favorite number?"))
for(var i=0;i<favnumber;i++){
System.out.println(name + "is bad at javascript");
}
</script>
any idea whats wrong?
JavaScript is not Java. So there is no function System.out.println() unless you define it.
To output you hav either to user the DOM, console or alert.
The later might look like this:
<script>
var favnumber = Number(prompt("What is your favorite number?"));
var name = 'Bob';
for(var i=0;i<favnumber;i++){
alert(name + " is bad at javascript");
}
</script>
Besides, try to get used to end every command with ;. Otherwise you run into many weird problems as a JavaScript beginner - and later as well.
JavaScript is not Java, so System.out.println doesn't have any special meaning. You have two options here: to use console.log(), or to use document.write().
I recommend you use console.log(), as it doesn't mess with the current page's HTML structure:
var favnumber = parseInt(prompt("What is your favorite number?"), 10);
var name = 'JavaScript';
for (var i = 0; i < favnumber; i++) {
console.log(name + ' is not Java');
}
You'll need to open up your browser's JavaScript console to see those messages.
Using document.write() is a bit more cumbersome:
var favnumber = parseInt(prompt("What is your favorite number?"), 10);
var name = 'JavaScript';
for (var i = 0; i < favnumber; i++) {
document.write(name + ' is not Java');
document.write('<br />');
}
Demo: http://jsfiddle.net/HC3Y2/