I'd like to execute a piece of JavaScript when a certain condition is true in my view model:
<script type="text/javascript">
@if (Model.Employees.Count > 1)
{
executeJsfunction();
}
</script>
This code doesn't compile, how should I do this?
Try with this:
<script type="text/javascript">
@if (Model.Employees.Count > 1)
{
@:executeJsfunction();
}
</script>
Note the "@:"
For multi-line script within the razor conditional block, you can use:
<script type="text/javascript">
@if (Model.Employees.Count > 1)
{
<text>
executeJsfunctionOne();
executeJsfunctionTwo();
executeJsfunctionThree({
"var_one": true,
"var_two": false
});
</text>
}
</script>
This can make it cleaner and more practical than adding @: to each line. Everything within the <text></text> blocks is rendered as script.
If you have more complicated JS, you can do the following (script tags, or any tags, within an @if don't need extra escaping):
@if (Model.Employees.Count > 1)
{
<script type="text/javascript">
$(function() {
executeJsfunction();
});
</script>
}
<script> tag needs to start in the conditional block. If I put the <script> tag out of it, and just had a block of JS in within the conditional, the Razor engine tried to parse it as C# and threw up.Use js if-else block, not C#. Js has its own if-else block.
<script type="text/javascript">
if (@Model.Employees.Count > 1)
{
executeJsfunction();
}
</script>
The MVC variables are processed on the server side, the code is always trying to render the Javascript values in order to generate the HTML, please try the code below :
<script type="text/javascript">
@{if (Model.Employees.Count > 1)
{
@:executeJsfunction();
}
}
</script>
I hope this helps.
I know this question posted while ago however I added a new solution as an alternative solution:
you can inject your value from the model into data attribute of selected DOM's element and validate your condition by checking the value of the same data attribute you injected while building your view.
for example, check the following view and the script code snippet how to do it:
<div id="myDiv" data-count="@Model.Employees.Count">
</div>
<script>
if($("#myDiv").data("count") > 1){
executeJsfunction();
}
</script>
In case if you don't want to even render the java script based on some condition
define a section in your layout html
<html>
<body>
@RenderSection("xyz", required: false)
</body>
</html>
in your view
@if (Model.Condition)
{
@section xyz{
<script>
$(function () {
// Your Javascript
});
</script>
}
}
In my case I don't want to expose my Javascript if that feature is not enabled, also it'll reduce the size of the page
