JavaScript's setTimeout function seems to be malfunctioning

Question

JavaScript's setTimeout function seems to be malfunctioning

I have implemented a JavaScript function to expand and collapse gridview rows. Below is the script:

<script type="text/javascript">
    function divexpandcollapse(divname) {
        var div = document.getElementById(divname);
        var img = document.getElementById('img' + divname);
        if (div.style.display == "none") {
            div.style.display = "inline";
            img.src = "Img1/minus.gif";
        } else {
            div.style.display = "none";
            img.src = "Img1/plus.gif";
        }
    }
</script>

Currently, when calling this JavaScript in my gridview, it expands immediately. I would like the panel to expand slowly. Is there an error in the coding with the setTimeout function? Any assistance on how to achieve this would be greatly appreciated...

<asp:TemplateField ItemStyle-Width="20px">
    <ItemTemplate>
        <a href="JavaScript:setTimeout(divexpandcollapse('div<%# Eval("ClaimMasterId") %>'),1000);">
            <img id='imgdiv<%# Eval("ClaimMasterId") %>' width="9px" border="0" src="Img1/plus.gif"
                alt="" /></a>                        
    </ItemTemplate>
    <ItemStyle Width="20px" VerticalAlign="Middle"></ItemStyle>
</asp:TemplateField>

javascript asp.net gridview

Answer 1

Answer №1

The reason for the issue is that it's invoking the function, capturing the return value, and then passing that to setTimeout. What you actually want to do is call the method with setTimeout, along with the arguments. To achieve this, use this alternative syntax:

window.setTimeout(func, [delay, param1, param2, ...]);

In your specific scenario, it should look like this:

setTimeout(divexpandcollapse ,1000, 'div<%# Eval("ClaimMasterId") %>')

Do you see the distinction? With this approach, setTimeout will execute your method and provide the parameters at that time.

If you prefer not to use that syntax of setTimeout, you can wrap your method call in another function:

setTimeout(function() { divexpandcollapse('div<%# Eval("ClaimMasterId") %>') }, 1000);

Nevertheless, I personally find the first method much more readable (and less cumbersome to type).

Answer 2

The reason for the issue is that it's invoking the function, capturing the return value, and then passing that to setTimeout. What you actually want to do is call the method with setTimeout, along with the arguments. To achieve this, use this alternative syntax:

window.setTimeout(func, [delay, param1, param2, ...]);

In your specific scenario, it should look like this:

setTimeout(divexpandcollapse ,1000, 'div<%# Eval("ClaimMasterId") %>')

Do you see the distinction? With this approach, setTimeout will execute your method and provide the parameters at that time.

If you prefer not to use that syntax of setTimeout, you can wrap your method call in another function:

setTimeout(function() { divexpandcollapse('div<%# Eval("ClaimMasterId") %>') }, 1000);

Nevertheless, I personally find the first method much more readable (and less cumbersome to type).

JavaScript's setTimeout function seems to be malfunctioning

Answer №1

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