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<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<script src=".1.1/jquery.min.js"></script>
<script src=".js/2.0.0/handlebars.js"></script>
</head>
<body>
<!--This is our template. -->
<!--Data will be inserted in its according place, replacing the brackets.-->
<script id="t" type="text/x-handlebars">
{{#each_when profile "gender" "male"}}
{{ID}}. {{from}} {{gender}}<br>
{{/each_when}}
</script>
<!--Your new content will be displayed in here-->
<div class="content-placeholder"></div>
<script>
var json = {
"profile": [
{ "ID": 1, "gender": "male", "from": "Olivia" },
{ "ID": 2, "gender": "male", "from": "Meagen" },
{ "ID": 3, "gender": "female, male", "from": "Aaron" },
{ "ID": 4, "gender": "female", "from": "Aaron" }
]
};
Handlebars.registerHelper('each_when', function(list, k, v, opts) {
console.log(arguments);
var i, result = '';
for(i = 0; i < list.length; ++i)
if(list[i][k] == v)
result = result + opts.fn(list[i]);
return result;
});
var t = Handlebarspile($('#t').html());
$('body').append(t(json));
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<script src="https://ajax.googleapis./ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare./ajax/libs/handlebars.js/2.0.0/handlebars.js"></script>
</head>
<body>
<!--This is our template. -->
<!--Data will be inserted in its according place, replacing the brackets.-->
<script id="t" type="text/x-handlebars">
{{#each_when profile "gender" "male"}}
{{ID}}. {{from}} {{gender}}<br>
{{/each_when}}
</script>
<!--Your new content will be displayed in here-->
<div class="content-placeholder"></div>
<script>
var json = {
"profile": [
{ "ID": 1, "gender": "male", "from": "Olivia" },
{ "ID": 2, "gender": "male", "from": "Meagen" },
{ "ID": 3, "gender": "female, male", "from": "Aaron" },
{ "ID": 4, "gender": "female", "from": "Aaron" }
]
};
Handlebars.registerHelper('each_when', function(list, k, v, opts) {
console.log(arguments);
var i, result = '';
for(i = 0; i < list.length; ++i)
if(list[i][k] == v)
result = result + opts.fn(list[i]);
return result;
});
var t = Handlebars.pile($('#t').html());
$('body').append(t(json));
</script>
</body>
</html>The result of the above code is:
1. Olivia male
2. Meagen male
But I want the following:
1. Olivia male
2. Meagen male
3. Aaron male
I am filtering an array of objects by a property and that property is a string that can contain multiple values.
Is there any one who can tell me why 3. Aaron male is not appearing?
1 Answer
Reset to default 3The object with the ID of 3 does not get appended to your result because your helper is filtering out objects whose gender property is NOT equal to "male". Object 3's gender is "female, male", so it does not pass the equality test.
If you want to check whether list[i][k] contains v, then you must update your logic.
var i, result = '', values;
for (i = 0; i < list.length; ++i) {
values = list[i][k].replace(/\s*,\s*/, ',').split(',');
if (values.indexOf(v) > -1) {
result += opts.fn(list[i]);
}
}
return result;
Note that I am using a regex to remove the white-space characters beside the "," before splitting - this way I can ensure that the elements in my values array do not begin or end with a space.
This update will append the "Aaron" object to the output. However, the final result will be:
1. Olivia male<br>
2. Meagen male<br>
3. Aaron female, male<br>
If you don't want "female, male" to display for Aaron that means you don't really want to render the object's gender property. Instead, you should just hard-code the text you want right into the template:
{{ID}}. {{from}} male<br>
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<script src=".1.1/jquery.min.js"></script>
<script src=".js/2.0.0/handlebars.js"></script>
</head>
<body>
<!--This is our template. -->
<!--Data will be inserted in its according place, replacing the brackets.-->
<script id="t" type="text/x-handlebars">
{{#each_when profile "gender" "male"}}
{{ID}}. {{from}} {{gender}}<br>
{{/each_when}}
</script>
<!--Your new content will be displayed in here-->
<div class="content-placeholder"></div>
<script>
var json = {
"profile": [
{ "ID": 1, "gender": "male", "from": "Olivia" },
{ "ID": 2, "gender": "male", "from": "Meagen" },
{ "ID": 3, "gender": "female, male", "from": "Aaron" },
{ "ID": 4, "gender": "female", "from": "Aaron" }
]
};
Handlebars.registerHelper('each_when', function(list, k, v, opts) {
console.log(arguments);
var i, result = '';
for(i = 0; i < list.length; ++i)
if(list[i][k] == v)
result = result + opts.fn(list[i]);
return result;
});
var t = Handlebarspile($('#t').html());
$('body').append(t(json));
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<script src="https://ajax.googleapis./ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare./ajax/libs/handlebars.js/2.0.0/handlebars.js"></script>
</head>
<body>
<!--This is our template. -->
<!--Data will be inserted in its according place, replacing the brackets.-->
<script id="t" type="text/x-handlebars">
{{#each_when profile "gender" "male"}}
{{ID}}. {{from}} {{gender}}<br>
{{/each_when}}
</script>
<!--Your new content will be displayed in here-->
<div class="content-placeholder"></div>
<script>
var json = {
"profile": [
{ "ID": 1, "gender": "male", "from": "Olivia" },
{ "ID": 2, "gender": "male", "from": "Meagen" },
{ "ID": 3, "gender": "female, male", "from": "Aaron" },
{ "ID": 4, "gender": "female", "from": "Aaron" }
]
};
Handlebars.registerHelper('each_when', function(list, k, v, opts) {
console.log(arguments);
var i, result = '';
for(i = 0; i < list.length; ++i)
if(list[i][k] == v)
result = result + opts.fn(list[i]);
return result;
});
var t = Handlebars.pile($('#t').html());
$('body').append(t(json));
</script>
</body>
</html>The result of the above code is:
1. Olivia male
2. Meagen male
But I want the following:
1. Olivia male
2. Meagen male
3. Aaron male
I am filtering an array of objects by a property and that property is a string that can contain multiple values.
Is there any one who can tell me why 3. Aaron male is not appearing?
1 Answer
Reset to default 3The object with the ID of 3 does not get appended to your result because your helper is filtering out objects whose gender property is NOT equal to "male". Object 3's gender is "female, male", so it does not pass the equality test.
If you want to check whether list[i][k] contains v, then you must update your logic.
var i, result = '', values;
for (i = 0; i < list.length; ++i) {
values = list[i][k].replace(/\s*,\s*/, ',').split(',');
if (values.indexOf(v) > -1) {
result += opts.fn(list[i]);
}
}
return result;
Note that I am using a regex to remove the white-space characters beside the "," before splitting - this way I can ensure that the elements in my values array do not begin or end with a space.
This update will append the "Aaron" object to the output. However, the final result will be:
1. Olivia male<br>
2. Meagen male<br>
3. Aaron female, male<br>
If you don't want "female, male" to display for Aaron that means you don't really want to render the object's gender property. Instead, you should just hard-code the text you want right into the template:
{{ID}}. {{from}} male<br>
本文标签： javascriptHow do I filter this array using value with handlebarsjsStack Overflow
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