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Javascript Question

Posted on 2014-11-11
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Last Modified: 2014-11-16
Hi,

 I have attached the  script where I iterate through a list on one site and fetch values and then get list items from another list on another site and the title field of the first list should match the description of the URL field in the second list. and a table is built using the combined values. How do I modify this script so it is much more efficient? Right now it is a bit slower. Please help., also am doing a string comparison in the below script which is sometimes failing even though the strings match. What Am I doing wrong?
script.txt
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Question by:Techsavy
  • 2
4 Comments
 
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Expert Comment

by:Alexandre Simões
ID: 40437785
Hi mate...
Like this out of nothing, with no concrete example it's hard to figure out what's going on.

On the topics you have SharePoint...
Is this IFrames running Provider Hosted Apps that you want to extract data from?
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Accepted Solution

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Alexandre Simões earned 500 total points
ID: 40437825
Reading your code I can already see one improvement that will boost the process.

On the getprojects function you add a row the the table on each loop.
Don't do it like this. Instead, only change the DOM once at the end, which is the same to say that only do one $('#statusTable').append(...) at the end of the loop.

Specially if you have a lot of rows you'll see a big difference.
Here's the modified code:
$(document).ready(function () {
    getprojects();
});

function getprojects() {

    var hostweb = getSiteUrl();
    var url = hostweb + "/_api/web/lists/getbytitle('Related Projects')/items?";
	var htmlRows = [];
	
    $.ajax({
        url: url,
        method: "GET",
        async: false,
        headers: { "Accept": "application/json; odata=verbose" },
        success: function (data) {

            if (data.d.results.length > 0) {

                for (var i = 0; i < data.d.results.length; i++) {
                    var projectName = data.d.results[i].Title;
                    var projectURL = data.d.results[i].ProjectURL;
                    htmlRows.push(getProjectRow(projectName, projectURL));
                }

            }
            else {
                htmlRows.push('<tr class="mrvl-tblRow"><td colspan="2">No Related Projects Added</td></tr>');
            }
			
			$('#statusTable').append(htmlRows.join(''));
        },
        error: function (data) {
            //failure(data);
        }
    });
}

function getProjectRow(projectTitle, projectLink) {
    var projectName;
    var projectURL;
    var projectStatus;

    var listItemInfo = '';
    //Make a REST CALL to read all Items from the list.
    var pmsiteUrl = "http://mysite.com/it/pm/_api/web/lists/getbytitle('Dashboard')/items?$select=Project,Project_x0020_Status";


    $.ajax({
        url: pmsiteUrl,
        method: "GET",
        async: false,
        headers: { "Accept": "application/json; odata=verbose" },
        success: function (data) {

            if (data.d.results.length > 0) {
                for (var i = 0; i < data.d.results.length; i++) {
                    if (data.d.results[i].Project != null) {
                        projectName = data.d.results[i].Project.Description;
                    }
                    else {
                        projectName = "";
                    }

                    if (data.d.results[i].Project != null) {
                        projectURL = data.d.results[i].Project.Url;
                    } else {
                        projectURL = "";
                    }

                    if (data.d.results[i].Project_x0020_Status != null) {
                        var label = data.d.results[i].Project_x0020_Status.Label;
                        projectStatus = getStatusIndicator(label);
                    } else {
                        projectStatus = "-";
                    }

                    if (projectName == projectTitle) {
                        listItemInfo += "<tr class='mrvl-tblRow'><td>" + "<a href='" + projectURL + "'target='_blank'>" + projectName + "</a></td><td style='text-align:center;'>" + projectStatus + "</td></tr>";
                    }
                }

                return listItemInfo;
            }
            else {
                alert('Could not Contact IT PM Site');
            }
        },
        error: function (data) {
        }
    });

}



//getstatusindicator

function getStatusIndicator(statuslabel) {
    var returnString = "";

    switch (statuslabel) {
        case "60":
            returnString += "<img src='_layouts/images/kpinormal-2.gif' title='Red' alt='Red'/>";
            break;
        case "57":
            returnString += "<img src='_layouts/images/kpinormal-1.gif' title='Yellow' alt='Yellow'/>";
            break;
        case "55":
            returnString += "<img src='_layouts/images/kpinormal-0.gif' title='Green' alt='Green'/>";
            break;
        default:
            returnString += "-";
    }


    return returnString;

}

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Expert Comment

by:Steve Bink
ID: 40438020
Here's a couple articles I came across recently.  The second link has a really good demonstration of the savings involved with each optimization.

https://developers.google.com/speed/articles/optimizing-javascript
http://www.webreference.com/programming/javascript/jkm3/index.html
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Author Closing Comment

by:Techsavy
ID: 40446022
Thank you
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