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POAltering a page from a Greasemonkey script whenever a specific <option> is selected
 

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  1. POAltering a page from a Greasemonkey script whenever a specific <option> is selected
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    <p>While writing a GreaseMonkey script using jQuery and "tamtam", a question arose in my mind.</p> <p>There is a page (which I can't edit) having a <code>&lt;select&gt;</code> element with four options. Option 2 is preselected.</p> <pre><code>&lt;select id="idname" name="namename"&gt; &lt;option&gt;Option1&lt;/option&gt; &lt;option selected="selected"&gt;Option2&lt;/option&gt; &lt;option&gt;Option3&lt;/option&gt; &lt;option&gt;Option4&lt;/option&gt; &lt;/select&gt; </code></pre> <p>Now I'd like to call the script when Option1 is selected. Option1 leads to another site I want to insert my script.</p> <p>How would I write something like:</p> <pre><code>if (Option1 is selected) { perform the script } </code></pre> <p>Would something like the following work?</p> <pre><code>if(document.getElementById("idname").getElementsByTagName("option")[0].onselect == true){ perform the script } </code></pre> <p>If not, can you post a reference helping me?</p> <p><strong>Edit</strong></p> <p>I was able to create a function and an event handler.</p> <pre><code>function myCompute(Event) { with (this) { var myTest = value; if (value == "option1") { $("#tabelle").show(); } else { $("#tabelle").hide(); } } } </code></pre> <p>Event handlers:</p> <pre><code>$("#option-type").change (myCompute); $("#tabelle").hide(); </code></pre> <p>It works as follows: By choosing option 2,3 or 4 the table is hidden. By choosing option 1 the table is shown. By visiting the site option 2 is selected most of the time and nothing is shown. Now I got the case that option 1 is selected by visiting the site and no table appears, too. My idea was that the table should be shown when option1 is preselected.. I think that an EventHandler is missing. Like you, Brock Adams, said.</p> <pre><code>$("#option-type option:first").select (myCompute); $("#option-type").change (myCompute); $("#tabelle").hide(); </code></pre> <p>If I bind the function with <code>$("#tabelle").hide();</code>, the table is hidden from the very beginning. By changing the options to option1 the table is shown. How can I show the table when option 1 is selected and how can I hide the table when option 2,3,4 are selected?</p> <p>Trying <code>option:first</code> results in an "unknown pseudo-element" error.</p>
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    1. COSO is a Q&A site. If you have multiple questions, they should be posted separately. Also, questions shouldn't contain answers; you can answer your own questions, so do so. While questions can (and should) be edited if they need anything (e.g. clarifications), they shouldn't be edited to ask a new question, as it invalidates existing answers and causes confusion.
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