MVC C＃中带有Razor的条件OnClick

Question

I have a variable named wURL which contains a URL. If the URL is NULL I would like to not have the onclick Event in my TD. My trouble is figuring out how to do this in razor syntax:

<td class="" onclick="window.open('@wURL', '_blank')">

I'm thinking it should be something like this:

<td class="" (@wURL ?){ onclick="window.open('@wURL', '_blank')"}>

But This doesn't work. What is the correct way to write this?

Answer 1

尝试这个：

<td @(Html.Raw(wURL == null ? "" : $"onclick=\"window.open('{wURL}', '_blank')\"")) >

Answer 2

Edit:

I'll leave this here for those who want to display different elements switch a condition with razor :

@if(condition){
    <td onclick="window.open('@wURL','_blank')">...</td>
}
else{
    <td >...</td>
}

However, if you want only a part of it to be different, then you'll find the other answers more suitable.

Answer 3

@{string oc = wURL == null ? "" : "onclick=window.open('" + @wURL + "','_blank')";}
<td class = "" @oc>

At request of questioner I'll break down the ternary into a simpler if-else statement for clarification:

@{ // start a c# block
    string oc; // create a string variable
    if wURL == null { //before I used a "ternary" conditional, but this compiles to the same thing
        oc = ""; // if wURL is null set oc to empty string, so nothing will be written in the tag 
    } 
    else 
    { 
        oc = "onclick=window.open('" + @wURL + "','_blank')"; // set the onclick to open a window with the wURL variable
    }
}
<td class = "" @oc> 
<!-- If the oc variable is empty, nothing will be written after class modifier, otherwise you'll get the onclick statement -->

To see how the if-else statement can be compacted into the ternary in the original example look here .