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POjQuery Deferred object, calling functions in sequence
 

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  1. POjQuery Deferred object, calling functions in sequence
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    <p>I'm confused about how to use jQuery's Deferred object, and the examples I've seen aren't helping me. What I want to do is 1.) get a calendar object via an ajax call, 2.) populate part of my global object (MYOBJ) with the calendar data, and then 3.) populate a page element with the new data in MYOBJ. These three functions implement the logic, and I want to call them in sequence:</p> <pre><code>function getCalendar(refDate, numDays) { return $.ajax({ type: "POST", url: "services/Calendar.asmx/GetCalendar", data: '{ "refDate": "' + refDate + '", "numDays": "' + numDays + '" }', contentType: "application/json; charset=utf-8", dataType: "json" }).promise(); } function loadCalendarData(response) { var calData = jQuery.parseJSON(response.d); MYOBJ.cal.dMin = calData.dMin; MYOBJ.cal.dMax = calData.dMax; MYOBJ.cal.dates = calData.dates; // array of date strings } function populateCalendar (x, y, z) { // use data from MYOBJ.cal here } </code></pre> <p>I can't figure out how to make populateCalendar() wait until loadCalendarData() is done, though. This...</p> <pre><code>$.when(getCalendar(myDate, 70)) .then(loadCalendarData) .then(populateCalendar(a, b, c)) .fail(alertCalendarError); </code></pre> <p>...is obviously incorrect--it's just one variation I've thrown against the wall because I don't understand what I'm doing... :)</p> <p><strong>UPDATE:</strong> As GoldenNewby and Brian ONeil correctly point out, I could just stick my call to populateCalendar at the end of loadCalendarData. That will definitely work. I wish I had thought of that as I was posting. I guess my ultimate objective was to figure out how to achieve the sequencing. In this case, though, I can't think of any scenario where loadCalendarData would be called without a call to populateCalendar directly after it, so this solution definitely makes sense. Thanks.</p>
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    1. USFred Mars
    1. USFred Mars
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    1. COCan you not just call populateCalendar as the last line of loadCalendarData?
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      1. USGoldenNewby
    2. COThat would definitely work, thank you. I'm sorry, though, I forgot to mention that I'm trying to keep those functions as independent of each other as possible. The example I gave is from page load, but conceivably either function could be called after that as well. Mainly I am trying to wrap my head around deferreds, and this was an example of something I couldn't figure out how to do.
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