Alert if a variable is is undefined
0
Following function gets a value sp_value from radio button if checked.
function spk() {
if (document.getElementById('sp1').checked) {
sp_value = document.getElementById('sp1').value;
} else if (document.getElementById('sp2').checked) {
sp_value = document.getElementById('sp2').value;
} else if (document.getElementById('sp3').checked) {
sp_value = document.getElementById('sp3').value;
}
}
And put the value sp_value in audio source of following function
function PlayVerse(surat, n) {
var aud = document.getElementById("myaudio");
aud.src = "http://data.quranacademy.com/AUDIOS/VerseByVerse/Media-" +
sp_value + "/01_" + TxtFormat(surat, "000") + "_" + TxtFormat(n, "000") + ".mp3";
var x = document.getElementsByTagName("IMG");
var i;
for (i = 0; i < x.length; i++) {
x[i].style = 'display: inline-block; border: 1px solid #ddd; border-radius: 4px; padding: 5px;';
}
}
Now I want to alert a message when user click on function PlayVerse if the radio button is unchecked or you can say the sp_Value is undefined.
javascript
edited Nov 24 '18 at 11:54
Foo
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
add a comment |
0
Following function gets a value sp_value from radio button if checked.
function spk() {
if (document.getElementById('sp1').checked) {
sp_value = document.getElementById('sp1').value;
} else if (document.getElementById('sp2').checked) {
sp_value = document.getElementById('sp2').value;
} else if (document.getElementById('sp3').checked) {
sp_value = document.getElementById('sp3').value;
}
}
And put the value sp_value in audio source of following function
function PlayVerse(surat, n) {
var aud = document.getElementById("myaudio");
aud.src = "http://data.quranacademy.com/AUDIOS/VerseByVerse/Media-" +
sp_value + "/01_" + TxtFormat(surat, "000") + "_" + TxtFormat(n, "000") + ".mp3";
var x = document.getElementsByTagName("IMG");
var i;
for (i = 0; i < x.length; i++) {
x[i].style = 'display: inline-block; border: 1px solid #ddd; border-radius: 4px; padding: 5px;';
}
}
Now I want to alert a message when user click on function PlayVerse if the radio button is unchecked or you can say the sp_Value is undefined.
javascript
edited Nov 24 '18 at 11:54
Foo
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
1
if (typeof sp_Value === "undefined") {...}
– Rafael Mora
Nov 24 '18 at 11:49
1
Or equivalently, more concisely, justif (sp_Value === undefined)
– Robin Zigmond
Nov 24 '18 at 11:52
add a comment |
0
0
0
Following function gets a value sp_value from radio button if checked.
function spk() {
if (document.getElementById('sp1').checked) {
sp_value = document.getElementById('sp1').value;
} else if (document.getElementById('sp2').checked) {
sp_value = document.getElementById('sp2').value;
} else if (document.getElementById('sp3').checked) {
sp_value = document.getElementById('sp3').value;
}
}
And put the value sp_value in audio source of following function
function PlayVerse(surat, n) {
var aud = document.getElementById("myaudio");
aud.src = "http://data.quranacademy.com/AUDIOS/VerseByVerse/Media-" +
sp_value + "/01_" + TxtFormat(surat, "000") + "_" + TxtFormat(n, "000") + ".mp3";
var x = document.getElementsByTagName("IMG");
var i;
for (i = 0; i < x.length; i++) {
x[i].style = 'display: inline-block; border: 1px solid #ddd; border-radius: 4px; padding: 5px;';
}
}
Now I want to alert a message when user click on function PlayVerse if the radio button is unchecked or you can say the sp_Value is undefined.
javascript
edited Nov 24 '18 at 11:54
Foo
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
Following function gets a value sp_value from radio button if checked.
function spk() {
if (document.getElementById('sp1').checked) {
sp_value = document.getElementById('sp1').value;
} else if (document.getElementById('sp2').checked) {
sp_value = document.getElementById('sp2').value;
} else if (document.getElementById('sp3').checked) {
sp_value = document.getElementById('sp3').value;
}
}
And put the value sp_value in audio source of following function
function PlayVerse(surat, n) {
var aud = document.getElementById("myaudio");
aud.src = "http://data.quranacademy.com/AUDIOS/VerseByVerse/Media-" +
sp_value + "/01_" + TxtFormat(surat, "000") + "_" + TxtFormat(n, "000") + ".mp3";
var x = document.getElementsByTagName("IMG");
var i;
for (i = 0; i < x.length; i++) {
x[i].style = 'display: inline-block; border: 1px solid #ddd; border-radius: 4px; padding: 5px;';
}
}
Now I want to alert a message when user click on function PlayVerse if the radio button is unchecked or you can say the sp_Value is undefined.
javascript
javascript
edited Nov 24 '18 at 11:54
Foo
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
edited Nov 24 '18 at 11:54
Foo
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
edited Nov 24 '18 at 11:54
Foo
1
edited Nov 24 '18 at 11:54
Foo
1
edited Nov 24 '18 at 11:54
Foo
1
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
asked Nov 24 '18 at 11:44
M Arif ShahidM Arif Shahid
1
1
1
if (typeof sp_Value === "undefined") {...}
– Rafael Mora
Nov 24 '18 at 11:49
1
Or equivalently, more concisely, justif (sp_Value === undefined)
– Robin Zigmond
Nov 24 '18 at 11:52
add a comment |
1
if (typeof sp_Value === "undefined") {...}
– Rafael Mora
Nov 24 '18 at 11:49
1
Or equivalently, more concisely, justif (sp_Value === undefined)
– Robin Zigmond
Nov 24 '18 at 11:52
1
1
if (typeof sp_Value === "undefined") {...}
– Rafael Mora
Nov 24 '18 at 11:49
if (typeof sp_Value === "undefined") {...}
– Rafael Mora
Nov 24 '18 at 11:49
1
1
Or equivalently, more concisely, just
if (sp_Value === undefined)– Robin Zigmond
Nov 24 '18 at 11:52
Or equivalently, more concisely, just
if (sp_Value === undefined)– Robin Zigmond
Nov 24 '18 at 11:52
add a comment |
1 Answer
1
active
oldest
votes
0
You only need to check if sp_value is not empty when calling PlayVerse():
if(sp_value) {
PlayVerse(surat, n);
} else {
alert("Please, select a value");
}
I hope that helps :-D
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
Will you please explain bit more that in which function I need to type above said script or I should type it separately??
– M Arif Shahid
Nov 26 '18 at 4:32
You should use the code above whenever you would like to call PlayVerse(surat, n);. In other words, you should replace PlayVerse(surat, n); with :
– CryptoBird
Nov 26 '18 at 12:50
if(sp_value) { PlayVerse(surat, n); } else { alert("Please, select a value"); }
– CryptoBird
Nov 26 '18 at 12:50
If that didn't make sense to you, please, attach to whole JS file to edit it for you :-D
– CryptoBird
Nov 26 '18 at 12:52
Thanks bro, but I have fixed the issue by typing else script..
– M Arif Shahid
Nov 27 '18 at 16:17
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53457771%2falert-if-a-variable-is-is-undefined%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
You only need to check if sp_value is not empty when calling PlayVerse():
if(sp_value) {
PlayVerse(surat, n);
} else {
alert("Please, select a value");
}
I hope that helps :-D
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
Will you please explain bit more that in which function I need to type above said script or I should type it separately??
– M Arif Shahid
Nov 26 '18 at 4:32
You should use the code above whenever you would like to call PlayVerse(surat, n);. In other words, you should replace PlayVerse(surat, n); with :
– CryptoBird
Nov 26 '18 at 12:50
if(sp_value) { PlayVerse(surat, n); } else { alert("Please, select a value"); }
– CryptoBird
Nov 26 '18 at 12:50
If that didn't make sense to you, please, attach to whole JS file to edit it for you :-D
– CryptoBird
Nov 26 '18 at 12:52
Thanks bro, but I have fixed the issue by typing else script..
– M Arif Shahid
Nov 27 '18 at 16:17
add a comment |
0
You only need to check if sp_value is not empty when calling PlayVerse():
if(sp_value) {
PlayVerse(surat, n);
} else {
alert("Please, select a value");
}
I hope that helps :-D
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
Will you please explain bit more that in which function I need to type above said script or I should type it separately??
– M Arif Shahid
Nov 26 '18 at 4:32
You should use the code above whenever you would like to call PlayVerse(surat, n);. In other words, you should replace PlayVerse(surat, n); with :
– CryptoBird
Nov 26 '18 at 12:50
if(sp_value) { PlayVerse(surat, n); } else { alert("Please, select a value"); }
– CryptoBird
Nov 26 '18 at 12:50
If that didn't make sense to you, please, attach to whole JS file to edit it for you :-D
– CryptoBird
Nov 26 '18 at 12:52
Thanks bro, but I have fixed the issue by typing else script..
– M Arif Shahid
Nov 27 '18 at 16:17
add a comment |
0
0
0
You only need to check if sp_value is not empty when calling PlayVerse():
if(sp_value) {
PlayVerse(surat, n);
} else {
alert("Please, select a value");
}
I hope that helps :-D
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
You only need to check if sp_value is not empty when calling PlayVerse():
if(sp_value) {
PlayVerse(surat, n);
} else {
alert("Please, select a value");
}
I hope that helps :-D
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
edited Nov 24 '18 at 16:16
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
answered Nov 24 '18 at 16:10
CryptoBirdCryptoBird
16012
16012
Will you please explain bit more that in which function I need to type above said script or I should type it separately??
– M Arif Shahid
Nov 26 '18 at 4:32
You should use the code above whenever you would like to call PlayVerse(surat, n);. In other words, you should replace PlayVerse(surat, n); with :
– CryptoBird
Nov 26 '18 at 12:50
if(sp_value) { PlayVerse(surat, n); } else { alert("Please, select a value"); }
– CryptoBird
Nov 26 '18 at 12:50
If that didn't make sense to you, please, attach to whole JS file to edit it for you :-D
– CryptoBird
Nov 26 '18 at 12:52
Thanks bro, but I have fixed the issue by typing else script..
– M Arif Shahid
Nov 27 '18 at 16:17
add a comment |
Will you please explain bit more that in which function I need to type above said script or I should type it separately??
– M Arif Shahid
Nov 26 '18 at 4:32
You should use the code above whenever you would like to call PlayVerse(surat, n);. In other words, you should replace PlayVerse(surat, n); with :
– CryptoBird
Nov 26 '18 at 12:50
if(sp_value) { PlayVerse(surat, n); } else { alert("Please, select a value"); }
– CryptoBird
Nov 26 '18 at 12:50
If that didn't make sense to you, please, attach to whole JS file to edit it for you :-D
– CryptoBird
Nov 26 '18 at 12:52
Thanks bro, but I have fixed the issue by typing else script..
– M Arif Shahid
Nov 27 '18 at 16:17
Will you please explain bit more that in which function I need to type above said script or I should type it separately??
– M Arif Shahid
Nov 26 '18 at 4:32
Will you please explain bit more that in which function I need to type above said script or I should type it separately??
– M Arif Shahid
Nov 26 '18 at 4:32
You should use the code above whenever you would like to call PlayVerse(surat, n);. In other words, you should replace PlayVerse(surat, n); with :
– CryptoBird
Nov 26 '18 at 12:50
You should use the code above whenever you would like to call PlayVerse(surat, n);. In other words, you should replace PlayVerse(surat, n); with :
– CryptoBird
Nov 26 '18 at 12:50
if(sp_value) { PlayVerse(surat, n); } else { alert("Please, select a value"); }
– CryptoBird
Nov 26 '18 at 12:50
if(sp_value) { PlayVerse(surat, n); } else { alert("Please, select a value"); }
– CryptoBird
Nov 26 '18 at 12:50
If that didn't make sense to you, please, attach to whole JS file to edit it for you :-D
– CryptoBird
Nov 26 '18 at 12:52
If that didn't make sense to you, please, attach to whole JS file to edit it for you :-D
– CryptoBird
Nov 26 '18 at 12:52
Thanks bro, but I have fixed the issue by typing else script..
– M Arif Shahid
Nov 27 '18 at 16:17
Thanks bro, but I have fixed the issue by typing else script..
– M Arif Shahid
Nov 27 '18 at 16:17
add a comment |
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53457771%2falert-if-a-variable-is-is-undefined%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
if (typeof sp_Value === "undefined") {...}
– Rafael Mora
Nov 24 '18 at 11:49
1
Or equivalently, more concisely, just
if (sp_Value === undefined)– Robin Zigmond
Nov 24 '18 at 11:52